开云体育

Easy 20 Watts with any qrp #bitx40


 

Sorry...let's try this again. I hate working on a phone.

Dan - I live on a sail boat. A couple of meters of tinned braid tossed over the side, a shortened 40 meter vertical, and 8 Watts from my uBITX V6 is all I need for a reliable Winlink connection across the Gulf of Mexico to Brownsville, TX for email and wind data. I know for a fact that I don't "need" 20W or even your suggested 50 W to do what I need to get done.

No sir - everybody does not "need" 50 or more Watts.? You do you - enjoy your QRO gear!?

There is no "reason" to build our own gear? There is no "reason" for the Amateur service either, I guess. That's not going to stop me from building, or continuing to learn how to build amplifiers. That's precisely why I got this ticket, after all.

Best, Andy, KG5RKP/MM


On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?

From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua


Dan Eggers N7DE
 

开云体育

I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power conversion, and that is also a very interesting area, but I also want to be able to talk to people.

? ? ? 73, Dan, N7DE? ?


From: [email protected] <[email protected]> on behalf of AndyH <awhecker@...>
Sent: Saturday, March 25, 2023 7:02 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.

I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn

On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?

From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua


 

开云体育


Single side band typically requires a 10 DB signal to noise ratio for useful communications in a disaster. ?That is, the efficient transfer of information

My contrast, using the same base noise in that bandwidth, data communications of moderate speed can tolerate SNR into low single digits, and still move efficient communications far faster than voice

Low data rate redundant digital communications can tolerate signal to noise ratios a couple orders of magnitude lower SNR

These comparisons are widely available

It’s no secret why people who are very involved in the (voice) national traffic system often have kilowatt amplifiers. ?

And people who are into JS8 ?don’t need them

So there are different requirements for different parts of our hobby




On Mar 26, 2023, at 11:33, Dan Eggers N7DE <N7DE@...> wrote:

?
I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power conversion, and that is also a very interesting area, but I also want to be able to talk to people.

? ? ? 73, Dan, N7DE? ?

From: [email protected] <[email protected]> on behalf of AndyH <awhecker@...>
Sent: Saturday, March 25, 2023 7:02 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.

I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn

On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?

From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua


Dan Eggers N7DE
 

开云体育

When you are running mm you can do some things that other people cannot do.? I run mobile CW when I am traveling across?the country, and that works very well for me.

I have a lot of different interests, and right now I am trying to get everyone to tie the two tubes from the inside unit to the outside unit of their air?conditioners together to make things operate more efficiently.? You may not need air conditioning when you are running mm, but it makes things more efficient for people with air condition systems like people in Texas.? I am in Edinburg, TX - not too far from Brownsville, TX, but I would like to go home to Seattle.? I will be running mobile CW most of the way.

? ? ? ? ?73, Dan, N7DE


From: [email protected] <[email protected]> on behalf of AndyH <awhecker@...>
Sent: Saturday, March 25, 2023 7:13 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
Sorry...let's try this again. I hate working on a phone.

Dan - I live on a sail boat. A couple of meters of tinned braid tossed over the side, a shortened 40 meter vertical, and 8 Watts from my uBITX V6 is all I need for a reliable Winlink connection across the Gulf of Mexico to Brownsville, TX for email and wind data. I know for a fact that I don't "need" 20W or even your suggested 50 W to do what I need to get done.

No sir - everybody does not "need" 50 or more Watts.? You do you - enjoy your QRO gear!?

There is no "reason" to build our own gear? There is no "reason" for the Amateur service either, I guess. That's not going to stop me from building, or continuing to learn how to build amplifiers. That's precisely why I got this ticket, after all.

Best, Andy, KG5RKP/MM

On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?

From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua


Dan Eggers N7DE
 

开云体育

I have been sending Morse code now for 57 years, and I will just continue to send Morse code, but since you seem to be very knowledgeable is there a digital voice modulation system that will eventually replace SSB?

Thank you.? ? ? ? ? 73, Dan, N7DE?


From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 8:42 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?

Single side band typically requires a 10 DB signal to noise ratio for useful communications in a disaster. ?That is, the efficient transfer of information

My contrast, using the same base noise in that bandwidth, data communications of moderate speed can tolerate SNR into low single digits, and still move efficient communications far faster than voice

Low data rate redundant digital communications can tolerate signal to noise ratios a couple orders of magnitude lower SNR

These comparisons are widely available

It’s no secret why people who are very involved in the (voice) national traffic system often have kilowatt amplifiers. ?

And people who are into JS8 ?don’t need them

So there are different requirements for different parts of our hobby




On Mar 26, 2023, at 11:33, Dan Eggers N7DE <N7DE@...> wrote:

?
I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power conversion, and that is also a very interesting area, but I also want to be able to talk to people.

? ? ? 73, Dan, N7DE? ?

From: [email protected] <[email protected]> on behalf of AndyH <awhecker@...>
Sent: Saturday, March 25, 2023 7:02 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.

I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn

On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?

From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua


 

开云体育

Eventually there will be something that replaces analog single side band voice. But it’s not yet here. ? And I think I have been doing CW for 55 years or more. ?

That’s my thought

Gordon Kx4z?



On Mar 26, 2023, at 11:51, Dan Eggers N7DE <N7DE@...> wrote:

?
I have been sending Morse code now for 57 years, and I will just continue to send Morse code, but since you seem to be very knowledgeable is there a digital voice modulation system that will eventually replace SSB?

Thank you.? ? ? ? ? 73, Dan, N7DE?

From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 8:42 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?

Single side band typically requires a 10 DB signal to noise ratio for useful communications in a disaster. ?That is, the efficient transfer of information

My contrast, using the same base noise in that bandwidth, data communications of moderate speed can tolerate SNR into low single digits, and still move efficient communications far faster than voice

Low data rate redundant digital communications can tolerate signal to noise ratios a couple orders of magnitude lower SNR

These comparisons are widely available

It’s no secret why people who are very involved in the (voice) national traffic system often have kilowatt amplifiers. ?

And people who are into JS8 ?don’t need them

So there are different requirements for different parts of our hobby




On Mar 26, 2023, at 11:33, Dan Eggers N7DE <N7DE@...> wrote:

?
I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power conversion, and that is also a very interesting area, but I also want to be able to talk to people.

? ? ? 73, Dan, N7DE? ?

From: [email protected] <[email protected]> on behalf of AndyH <awhecker@...>
Sent: Saturday, March 25, 2023 7:02 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.

I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn

On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?

From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua


Dan Eggers N7DE
 

开云体育

Thank you?for the information.? I see you and I are both CW old timers.? So far we have lost about half of the CW people without any real replacements coming along, but you and I came along during a certain era.

Best wishes.? ? ? ?73, Dan


From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 10:00 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
Eventually there will be something that replaces analog single side band voice. But it’s not yet here. ? And I think I have been doing CW for 55 years or more. ?

That’s my thought

Gordon Kx4z?



On Mar 26, 2023, at 11:51, Dan Eggers N7DE <N7DE@...> wrote:

?
I have been sending Morse code now for 57 years, and I will just continue to send Morse code, but since you seem to be very knowledgeable is there a digital voice modulation system that will eventually replace SSB?

Thank you.? ? ? ? ? 73, Dan, N7DE?

From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 8:42 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?

Single side band typically requires a 10 DB signal to noise ratio for useful communications in a disaster. ?That is, the efficient transfer of information

My contrast, using the same base noise in that bandwidth, data communications of moderate speed can tolerate SNR into low single digits, and still move efficient communications far faster than voice

Low data rate redundant digital communications can tolerate signal to noise ratios a couple orders of magnitude lower SNR

These comparisons are widely available

It’s no secret why people who are very involved in the (voice) national traffic system often have kilowatt amplifiers. ?

And people who are into JS8 ?don’t need them

So there are different requirements for different parts of our hobby




On Mar 26, 2023, at 11:33, Dan Eggers N7DE <N7DE@...> wrote:

?
I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power conversion, and that is also a very interesting area, but I also want to be able to talk to people.

? ? ? 73, Dan, N7DE? ?

From: [email protected] <[email protected]> on behalf of AndyH <awhecker@...>
Sent: Saturday, March 25, 2023 7:02 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.

I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn

On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?

From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua


 

开云体育

Well, for several years now we have observed some thing very fascinating among middle schoolers in our local school.

They are not interested at all in walkie-talkies
They are not interested at all in HF radios
Don’t even get me thinking about digital.

What they absolutely go crazy over, what they will grab onto and play with until you have to pull them away kicking and screaming with their parents,

Is a Morse code key!!!

At every school open house that we hold we now always provide multiple Morse code keys and it is a big draw.

We will provide them at this year‘s field day

The news media always want a picture of someone sending Morse code

We have two 6th graders in a very small school that are already doing about 10 words per minute. I sent 30 minutes worth of code to them two weeks ago?

It is astonishing the attraction that Morse code has for these middle schoolers

Meanwhile, across town, at the school devoted to future police and fire high schoolers, they have an extremely active contesting high school I am radio club and I am told that their best operator can do over 30 words per minute and they routinely make hundreds and hundreds of contacts at voice and CW in contests. ?

Our local ham radio club would have a hard time beating them!!!!

So I wouldn’t quite give up yet. ?human nature is the same. And there are certain number of us who really love the auditory and tactile tickling that only Morse code gives…. And by the way it is the first digital, the only digital that can be decoded by the human brain without much else. ?End it enjoys an order of magnitude or two advantage over voice In terms of threshold signal to noise ratio!!!?

On Mar 26, 2023, at 13:23, Dan Eggers N7DE <N7DE@...> wrote:

?
Thank you?for the information.? I see you and I are both CW old timers.? So far we have lost about half of the CW people without any real replacements coming along, but you and I came along during a certain era.

Best wishes.? ? ? ?73, Dan


From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 10:00 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
Eventually there will be something that replaces analog single side band voice. But it’s not yet here. ? And I think I have been doing CW for 55 years or more. ?

That’s my thought

Gordon Kx4z?



On Mar 26, 2023, at 11:51, Dan Eggers N7DE <N7DE@...> wrote:

?
I have been sending Morse code now for 57 years, and I will just continue to send Morse code, but since you seem to be very knowledgeable is there a digital voice modulation system that will eventually replace SSB?

Thank you.? ? ? ? ? 73, Dan, N7DE?

From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 8:42 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?

Single side band typically requires a 10 DB signal to noise ratio for useful communications in a disaster. ?That is, the efficient transfer of information

My contrast, using the same base noise in that bandwidth, data communications of moderate speed can tolerate SNR into low single digits, and still move efficient communications far faster than voice

Low data rate redundant digital communications can tolerate signal to noise ratios a couple orders of magnitude lower SNR

These comparisons are widely available

It’s no secret why people who are very involved in the (voice) national traffic system often have kilowatt amplifiers. ?

And people who are into JS8 ?don’t need them

So there are different requirements for different parts of our hobby




On Mar 26, 2023, at 11:33, Dan Eggers N7DE <N7DE@...> wrote:

?
I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power conversion, and that is also a very interesting area, but I also want to be able to talk to people.

? ? ? 73, Dan, N7DE? ?

From: [email protected] <[email protected]> on behalf of AndyH <awhecker@...>
Sent: Saturday, March 25, 2023 7:02 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.

I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn

On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?

From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua


Jack, W8TEE
 

Gordon:

Either RadComm or Sprat had an article how students in England were fascinated by Morse code. When asked why, they replied that "voice" (SSB) didn't interest them because they could do that with their cell phone. But Morse was "better" because their parents couldn't understand what was being said.

Any port in a storm...

Jack, W8TEE

On Sunday, March 26, 2023 at 01:55:50 PM EDT, Gordon Gibby <docvacuumtubes@...> wrote:


Well, for several years now we have observed some thing very fascinating among middle schoolers in our local school.

They are not interested at all in walkie-talkies
They are not interested at all in HF radios
Don’t even get me thinking about digital.

What they absolutely go crazy over, what they will grab onto and play with until you have to pull them away kicking and screaming with their parents,

Is a Morse code key!!!

At every school open house that we hold we now always provide multiple Morse code keys and it is a big draw.

We will provide them at this year‘s field day

The news media always want a picture of someone sending Morse code

We have two 6th graders in a very small school that are already doing about 10 words per minute. I sent 30 minutes worth of code to them two weeks ago?

It is astonishing the attraction that Morse code has for these middle schoolers

Meanwhile, across town, at the school devoted to future police and fire high schoolers, they have an extremely active contesting high school I am radio club and I am told that their best operator can do over 30 words per minute and they routinely make hundreds and hundreds of contacts at voice and CW in contests. ?

Our local ham radio club would have a hard time beating them!!!!

So I wouldn’t quite give up yet. ?human nature is the same. And there are certain number of us who really love the auditory and tactile tickling that only Morse code gives…. And by the way it is the first digital, the only digital that can be decoded by the human brain without much else. ?End it enjoys an order of magnitude or two advantage over voice In terms of threshold signal to noise ratio!!!?

On Mar 26, 2023, at 13:23, Dan Eggers N7DE <N7DE@...> wrote:

?
Thank you?for the information.? I see you and I are both CW old timers.? So far we have lost about half of the CW people without any real replacements coming along, but you and I came along during a certain era.

Best wishes.? ? ? ?73, Dan


From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 10:00 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
Eventually there will be something that replaces analog single side band voice. But it’s not yet here. ? And I think I have been doing CW for 55 years or more. ?

That’s my thought

Gordon Kx4z?



On Mar 26, 2023, at 11:51, Dan Eggers N7DE <N7DE@...> wrote:

?
I have been sending Morse code now for 57 years, and I will just continue to send Morse code, but since you seem to be very knowledgeable is there a digital voice modulation system that will eventually replace SSB?

Thank you.? ? ? ? ? 73, Dan, N7DE?

From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 8:42 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?

Single side band typically requires a 10 DB signal to noise ratio for useful communications in a disaster. ?That is, the efficient transfer of information

My contrast, using the same base noise in that bandwidth, data communications of moderate speed can tolerate SNR into low single digits, and still move efficient communications far faster than voice

Low data rate redundant digital communications can tolerate signal to noise ratios a couple orders of magnitude lower SNR

These comparisons are widely available

It’s no secret why people who are very involved in the (voice) national traffic system often have kilowatt amplifiers. ?

And people who are into JS8 ?don’t need them

So there are different requirements for different parts of our hobby




On Mar 26, 2023, at 11:33, Dan Eggers N7DE <N7DE@...> wrote:

?
I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power conversion, and that is also a very interesting area, but I also want to be able to talk to people.

? ? ? 73, Dan, N7DE? ?

From: [email protected] <[email protected]> on behalf of AndyH <awhecker@...>
Sent: Saturday, March 25, 2023 7:02 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.

I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn

On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?

From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua

--
Jack, W8TEE


 

The digital voice mode that could possibly replace ssb is freedv. It is actually two things that work together.
First, the voice is converted into a stream of very few bits per second. A usual voice stream like that of telephone uses about 64,000 bits per second. Freedv codec reduces it to 700 bits per second. This is at the cost of reduced quality. However, it is much better that SSB on 80 meters.
The second thing is an HF modem that can work at 700 bits per second. This is a weird one. On HF as signals bounce off the ionosphere and arrive at the rx antenna, you can have a situation where the same signal can arrive taking different paths and hence at different times , overlapping itself. This reduces the number of times you can rapidly change the frequency of the signal. This is why FT8 works so well, it is so slow that fading, et al doesnt affect it. So, what the freedv modem does is that it transmits a number of parallel ft8 like signals as separate tones within the same audio which when added up give you higher bandwidth. There is a very impressive name for it that escapes me now.
Our plan is to add freedv into the sbitx, making it the the first radio to support it natively.
- f

On Sun, Mar 26, 2023, 11:53 PM Jack, W8TEE via <jjpurdum=[email protected]> wrote:
Gordon:

Either RadComm or Sprat had an article how students in England were fascinated by Morse code. When asked why, they replied that "voice" (SSB) didn't interest them because they could do that with their cell phone. But Morse was "better" because their parents couldn't understand what was being said.

Any port in a storm...

Jack, W8TEE

On Sunday, March 26, 2023 at 01:55:50 PM EDT, Gordon Gibby <docvacuumtubes@...> wrote:


Well, for several years now we have observed some thing very fascinating among middle schoolers in our local school.

They are not interested at all in walkie-talkies
They are not interested at all in HF radios
Don’t even get me thinking about digital.

What they absolutely go crazy over, what they will grab onto and play with until you have to pull them away kicking and screaming with their parents,

Is a Morse code key!!!

At every school open house that we hold we now always provide multiple Morse code keys and it is a big draw.

We will provide them at this year‘s field day

The news media always want a picture of someone sending Morse code

We have two 6th graders in a very small school that are already doing about 10 words per minute. I sent 30 minutes worth of code to them two weeks ago?

It is astonishing the attraction that Morse code has for these middle schoolers

Meanwhile, across town, at the school devoted to future police and fire high schoolers, they have an extremely active contesting high school I am radio club and I am told that their best operator can do over 30 words per minute and they routinely make hundreds and hundreds of contacts at voice and CW in contests. ?

Our local ham radio club would have a hard time beating them!!!!

So I wouldn’t quite give up yet. ?human nature is the same. And there are certain number of us who really love the auditory and tactile tickling that only Morse code gives…. And by the way it is the first digital, the only digital that can be decoded by the human brain without much else.? End it enjoys an order of magnitude or two advantage over voice In terms of threshold signal to noise ratio!!!?

On Mar 26, 2023, at 13:23, Dan Eggers N7DE <N7DE@...> wrote:

?
Thank you?for the information.? I see you and I are both CW old timers.? So far we have lost about half of the CW people without any real replacements coming along, but you and I came along during a certain era.

Best wishes.? ? ? ?73, Dan


From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 10:00 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
Eventually there will be something that replaces analog single side band voice. But it’s not yet here. ? And I think I have been doing CW for 55 years or more. ?

That’s my thought

Gordon Kx4z?



On Mar 26, 2023, at 11:51, Dan Eggers N7DE <N7DE@...> wrote:

?
I have been sending Morse code now for 57 years, and I will just continue to send Morse code, but since you seem to be very knowledgeable is there a digital voice modulation system that will eventually replace SSB?

Thank you.? ? ? ? ? 73, Dan, N7DE?

From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 8:42 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?

Single side band typically requires a 10 DB signal to noise ratio for useful communications in a disaster.? That is, the efficient transfer of information

My contrast, using the same base noise in that bandwidth, data communications of moderate speed can tolerate SNR into low single digits, and still move efficient communications far faster than voice

Low data rate redundant digital communications can tolerate signal to noise ratios a couple orders of magnitude lower SNR

These comparisons are widely available

It’s no secret why people who are very involved in the (voice) national traffic system often have kilowatt amplifiers. ?

And people who are into JS8 ?don’t need them

So there are different requirements for different parts of our hobby




On Mar 26, 2023, at 11:33, Dan Eggers N7DE <N7DE@...> wrote:

?
I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power conversion, and that is also a very interesting area, but I also want to be able to talk to people.

? ? ? 73, Dan, N7DE? ?

From: [email protected] <[email protected]> on behalf of AndyH <awhecker@...>
Sent: Saturday, March 25, 2023 7:02 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.

I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn

On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?

From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua

--
Jack, W8TEE


Dan Eggers N7DE
 

开云体育

I think that is wonderful, and when you remember the name please send it to me.? I am at the point where I sort of forget things temporairly also, so that is no big deal.? Oh, well.? I am interested in a lot of different technologies that all take up my time, but of course I intend to continue to stick with CW.? ? ? 73, Dan
??


From: [email protected] <[email protected]> on behalf of Ashhar Farhan <farhanbox@...>
Sent: Sunday, March 26, 2023 4:35 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
The digital voice mode that could possibly replace ssb is freedv. It is actually two things that work together.
First, the voice is converted into a stream of very few bits per second. A usual voice stream like that of telephone uses about 64,000 bits per second. Freedv codec reduces it to 700 bits per second. This is at the cost of reduced quality. However, it is much better that SSB on 80 meters.
The second thing is an HF modem that can work at 700 bits per second. This is a weird one. On HF as signals bounce off the ionosphere and arrive at the rx antenna, you can have a situation where the same signal can arrive taking different paths and hence at different times , overlapping itself. This reduces the number of times you can rapidly change the frequency of the signal. This is why FT8 works so well, it is so slow that fading, et al doesnt affect it. So, what the freedv modem does is that it transmits a number of parallel ft8 like signals as separate tones within the same audio which when added up give you higher bandwidth. There is a very impressive name for it that escapes me now.
Our plan is to add freedv into the sbitx, making it the the first radio to support it natively.
- f

On Sun, Mar 26, 2023, 11:53 PM Jack, W8TEE via <jjpurdum=[email protected]> wrote:
Gordon:

Either RadComm or Sprat had an article how students in England were fascinated by Morse code. When asked why, they replied that "voice" (SSB) didn't interest them because they could do that with their cell phone. But Morse was "better" because their parents couldn't understand what was being said.

Any port in a storm...

Jack, W8TEE

On Sunday, March 26, 2023 at 01:55:50 PM EDT, Gordon Gibby <docvacuumtubes@...> wrote:


Well, for several years now we have observed some thing very fascinating among middle schoolers in our local school.

They are not interested at all in walkie-talkies
They are not interested at all in HF radios
Don’t even get me thinking about digital.

What they absolutely go crazy over, what they will grab onto and play with until you have to pull them away kicking and screaming with their parents,

Is a Morse code key!!!

At every school open house that we hold we now always provide multiple Morse code keys and it is a big draw.

We will provide them at this year‘s field day

The news media always want a picture of someone sending Morse code

We have two 6th graders in a very small school that are already doing about 10 words per minute. I sent 30 minutes worth of code to them two weeks ago?

It is astonishing the attraction that Morse code has for these middle schoolers

Meanwhile, across town, at the school devoted to future police and fire high schoolers, they have an extremely active contesting high school I am radio club and I am told that their best operator can do over 30 words per minute and they routinely make hundreds and hundreds of contacts at voice and CW in contests. ?

Our local ham radio club would have a hard time beating them!!!!

So I wouldn’t quite give up yet. ?human nature is the same. And there are certain number of us who really love the auditory and tactile tickling that only Morse code gives…. And by the way it is the first digital, the only digital that can be decoded by the human brain without much else.? End it enjoys an order of magnitude or two advantage over voice In terms of threshold signal to noise ratio!!!?

On Mar 26, 2023, at 13:23, Dan Eggers N7DE <N7DE@...> wrote:

?
Thank you?for the information.? I see you and I are both CW old timers.? So far we have lost about half of the CW people without any real replacements coming along, but you and I came along during a certain era.

Best wishes.? ? ? ?73, Dan


From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 10:00 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
Eventually there will be something that replaces analog single side band voice. But it’s not yet here. ? And I think I have been doing CW for 55 years or more. ?

That’s my thought

Gordon Kx4z?



On Mar 26, 2023, at 11:51, Dan Eggers N7DE <N7DE@...> wrote:

?
I have been sending Morse code now for 57 years, and I will just continue to send Morse code, but since you seem to be very knowledgeable is there a digital voice modulation system that will eventually replace SSB?

Thank you.? ? ? ? ? 73, Dan, N7DE?

From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 8:42 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?

Single side band typically requires a 10 DB signal to noise ratio for useful communications in a disaster.? That is, the efficient transfer of information

My contrast, using the same base noise in that bandwidth, data communications of moderate speed can tolerate SNR into low single digits, and still move efficient communications far faster than voice

Low data rate redundant digital communications can tolerate signal to noise ratios a couple orders of magnitude lower SNR

These comparisons are widely available

It’s no secret why people who are very involved in the (voice) national traffic system often have kilowatt amplifiers. ?

And people who are into JS8 ?don’t need them

So there are different requirements for different parts of our hobby




On Mar 26, 2023, at 11:33, Dan Eggers N7DE <N7DE@...> wrote:

?
I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power conversion, and that is also a very interesting area, but I also want to be able to talk to people.

? ? ? 73, Dan, N7DE? ?

From: [email protected] <[email protected]> on behalf of AndyH <awhecker@...>
Sent: Saturday, March 25, 2023 7:02 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.

I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn

On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?

From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua

--
Jack, W8TEE


 

My intention to use IRFP150 with 200mw drive was for pure experimentation.
Secondly i wanted a solution for changing the mosfet if someone using our kit burns the mosfet either while setting the bias voltage or due to high swr.

?The IRFP150 which I already had for some other project seemed a logical choice for me as it was very convenient to mount on the rear cover and just connect the legs to the pins where the IRF510 inserts, in this way it would be easier to change the FET if somehow it got burnt. The PCB pad is quite delicate and if someone was to remove the FET mounted on the pcb it could damage the pads.
Overall the experiment worked and the RF output was 20 watts with just two numbers of 2n3904 as drivers. keep in mind this FET wan't give much power above 7 MHZ. This is good for lower bands only.

Now it's not my suggestion to use IRFP150 , it depends on your taste as to what you want either the power or the type of FET to use. I just shared my experiment result with you all.


Best of 73's

DE VU3SUA
Sunil Lakhani



/








FUSION RADIO STORE





OUR NEW YAHOO GROUP





Tracking Link For Shipments:
For EMS AND REGISTERED





 

You can read it here


On Mon, Mar 27, 2023, 6:07 AM Dan Eggers N7DE <N7DE@...> wrote:
I think that is wonderful, and when you remember the name please send it to me.? I am at the point where I sort of forget things temporairly also, so that is no big deal.? Oh, well.? I am interested in a lot of different technologies that all take up my time, but of course I intend to continue to stick with CW.? ? ? 73, Dan
??

From: [email protected] <[email protected]> on behalf of Ashhar Farhan <farhanbox@...>
Sent: Sunday, March 26, 2023 4:35 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
The digital voice mode that could possibly replace ssb is freedv. It is actually two things that work together.
First, the voice is converted into a stream of very few bits per second. A usual voice stream like that of telephone uses about 64,000 bits per second. Freedv codec reduces it to 700 bits per second. This is at the cost of reduced quality. However, it is much better that SSB on 80 meters.
The second thing is an HF modem that can work at 700 bits per second. This is a weird one. On HF as signals bounce off the ionosphere and arrive at the rx antenna, you can have a situation where the same signal can arrive taking different paths and hence at different times , overlapping itself. This reduces the number of times you can rapidly change the frequency of the signal. This is why FT8 works so well, it is so slow that fading, et al doesnt affect it. So, what the freedv modem does is that it transmits a number of parallel ft8 like signals as separate tones within the same audio which when added up give you higher bandwidth. There is a very impressive name for it that escapes me now.
Our plan is to add freedv into the sbitx, making it the the first radio to support it natively.
- f

On Sun, Mar 26, 2023, 11:53 PM Jack, W8TEE via <jjpurdum=[email protected]> wrote:
Gordon:

Either RadComm or Sprat had an article how students in England were fascinated by Morse code. When asked why, they replied that "voice" (SSB) didn't interest them because they could do that with their cell phone. But Morse was "better" because their parents couldn't understand what was being said.

Any port in a storm...

Jack, W8TEE

On Sunday, March 26, 2023 at 01:55:50 PM EDT, Gordon Gibby <docvacuumtubes@...> wrote:


Well, for several years now we have observed some thing very fascinating among middle schoolers in our local school.

They are not interested at all in walkie-talkies
They are not interested at all in HF radios
Don’t even get me thinking about digital.

What they absolutely go crazy over, what they will grab onto and play with until you have to pull them away kicking and screaming with their parents,

Is a Morse code key!!!

At every school open house that we hold we now always provide multiple Morse code keys and it is a big draw.

We will provide them at this year‘s field day

The news media always want a picture of someone sending Morse code

We have two 6th graders in a very small school that are already doing about 10 words per minute. I sent 30 minutes worth of code to them two weeks ago?

It is astonishing the attraction that Morse code has for these middle schoolers

Meanwhile, across town, at the school devoted to future police and fire high schoolers, they have an extremely active contesting high school I am radio club and I am told that their best operator can do over 30 words per minute and they routinely make hundreds and hundreds of contacts at voice and CW in contests. ?

Our local ham radio club would have a hard time beating them!!!!

So I wouldn’t quite give up yet. ?human nature is the same. And there are certain number of us who really love the auditory and tactile tickling that only Morse code gives…. And by the way it is the first digital, the only digital that can be decoded by the human brain without much else.? End it enjoys an order of magnitude or two advantage over voice In terms of threshold signal to noise ratio!!!?

On Mar 26, 2023, at 13:23, Dan Eggers N7DE <N7DE@...> wrote:

?
Thank you?for the information.? I see you and I are both CW old timers.? So far we have lost about half of the CW people without any real replacements coming along, but you and I came along during a certain era.

Best wishes.? ? ? ?73, Dan


From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 10:00 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
Eventually there will be something that replaces analog single side band voice. But it’s not yet here. ? And I think I have been doing CW for 55 years or more. ?

That’s my thought

Gordon Kx4z?



On Mar 26, 2023, at 11:51, Dan Eggers N7DE <N7DE@...> wrote:

?
I have been sending Morse code now for 57 years, and I will just continue to send Morse code, but since you seem to be very knowledgeable is there a digital voice modulation system that will eventually replace SSB?

Thank you.? ? ? ? ? 73, Dan, N7DE?

From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 8:42 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?

Single side band typically requires a 10 DB signal to noise ratio for useful communications in a disaster.? That is, the efficient transfer of information

My contrast, using the same base noise in that bandwidth, data communications of moderate speed can tolerate SNR into low single digits, and still move efficient communications far faster than voice

Low data rate redundant digital communications can tolerate signal to noise ratios a couple orders of magnitude lower SNR

These comparisons are widely available

It’s no secret why people who are very involved in the (voice) national traffic system often have kilowatt amplifiers. ?

And people who are into JS8 ?don’t need them

So there are different requirements for different parts of our hobby




On Mar 26, 2023, at 11:33, Dan Eggers N7DE <N7DE@...> wrote:

?
I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power conversion, and that is also a very interesting area, but I also want to be able to talk to people.

? ? ? 73, Dan, N7DE? ?

From: [email protected] <[email protected]> on behalf of AndyH <awhecker@...>
Sent: Saturday, March 25, 2023 7:02 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.

I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn

On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?

From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua

--
Jack, W8TEE


 

The transistor is IRFP 150 that is being used in my easy Bitx after the driver of 2 no's 2n3904 .

By mistake I mentioned the FET as IRF150 it's IRFP150.

The make is Harris .

Picture?attached?

Regards?

Sunil vu3sua


 

开云体育

nope .. its the second

first is/was mchf (and now its cloned from china)

i brought david and our programming group together ... rest is history :-)

the guy with the laptop on very right is me ;-)

i have often used freedv with pc on shortwave and i have found out that the freedv hardware solution .. smartmic .. sm1000 .. has an stm32 chip and the mchf also has that stm32 inside ... then i brought david rove in contact of our user group

dg9bfc sigi

Am 27.03.2023 um 01:35 schrieb Ashhar Farhan:

The digital voice mode that could possibly replace ssb is freedv. It is actually two things that work together.
First, the voice is converted into a stream of very few bits per second. A usual voice stream like that of telephone uses about 64,000 bits per second. Freedv codec reduces it to 700 bits per second. This is at the cost of reduced quality. However, it is much better that SSB on 80 meters.
The second thing is an HF modem that can work at 700 bits per second. This is a weird one. On HF as signals bounce off the ionosphere and arrive at the rx antenna, you can have a situation where the same signal can arrive taking different paths and hence at different times , overlapping itself. This reduces the number of times you can rapidly change the frequency of the signal. This is why FT8 works so well, it is so slow that fading, et al doesnt affect it. So, what the freedv modem does is that it transmits a number of parallel ft8 like signals as separate tones within the same audio which when added up give you higher bandwidth. There is a very impressive name for it that escapes me now.
Our plan is to add freedv into the sbitx, making it the the first radio to support it natively.
- f

On Sun, Mar 26, 2023, 11:53 PM Jack, W8TEE via <jjpurdum=[email protected]> wrote:
Gordon:

Either RadComm or Sprat had an article how students in England were fascinated by Morse code. When asked why, they replied that "voice" (SSB) didn't interest them because they could do that with their cell phone. But Morse was "better" because their parents couldn't understand what was being said.

Any port in a storm...

Jack, W8TEE

On Sunday, March 26, 2023 at 01:55:50 PM EDT, Gordon Gibby <docvacuumtubes@...> wrote:


Well, for several years now we have observed some thing very fascinating among middle schoolers in our local school.

They are not interested at all in walkie-talkies
They are not interested at all in HF radios
Don’t even get me thinking about digital.

What they absolutely go crazy over, what they will grab onto and play with until you have to pull them away kicking and screaming with their parents,

Is a Morse code key!!!

At every school open house that we hold we now always provide multiple Morse code keys and it is a big draw.

We will provide them at this year‘s field day

The news media always want a picture of someone sending Morse code

We have two 6th graders in a very small school that are already doing about 10 words per minute. I sent 30 minutes worth of code to them two weeks ago?

It is astonishing the attraction that Morse code has for these middle schoolers

Meanwhile, across town, at the school devoted to future police and fire high schoolers, they have an extremely active contesting high school I am radio club and I am told that their best operator can do over 30 words per minute and they routinely make hundreds and hundreds of contacts at voice and CW in contests. ?

Our local ham radio club would have a hard time beating them!!!!

So I wouldn’t quite give up yet. ?human nature is the same. And there are certain number of us who really love the auditory and tactile tickling that only Morse code gives…. And by the way it is the first digital, the only digital that can be decoded by the human brain without much else.? End it enjoys an order of magnitude or two advantage over voice In terms of threshold signal to noise ratio!!!?

On Mar 26, 2023, at 13:23, Dan Eggers N7DE <N7DE@...> wrote:

?
Thank you?for the information.? I see you and I are both CW old timers.? So far we have lost about half of the CW people without any real replacements coming along, but you and I came along during a certain era.

Best wishes.? ? ? ?73, Dan


From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 10:00 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
Eventually there will be something that replaces analog single side band voice. But it’s not yet here. ? And I think I have been doing CW for 55 years or more. ?

That’s my thought

Gordon Kx4z?



On Mar 26, 2023, at 11:51, Dan Eggers N7DE <N7DE@...> wrote:

?
I have been sending Morse code now for 57 years, and I will just continue to send Morse code, but since you seem to be very knowledgeable is there a digital voice modulation system that will eventually replace SSB?

Thank you.? ? ? ? ? 73, Dan, N7DE?

From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 8:42 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?

Single side band typically requires a 10 DB signal to noise ratio for useful communications in a disaster.? That is, the efficient transfer of information

My contrast, using the same base noise in that bandwidth, data communications of moderate speed can tolerate SNR into low single digits, and still move efficient communications far faster than voice

Low data rate redundant digital communications can tolerate signal to noise ratios a couple orders of magnitude lower SNR

These comparisons are widely available

It’s no secret why people who are very involved in the (voice) national traffic system often have kilowatt amplifiers. ?

And people who are into JS8 ?don’t need them

So there are different requirements for different parts of our hobby




On Mar 26, 2023, at 11:33, Dan Eggers N7DE <N7DE@...> wrote:

?
I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power conversion, and that is also a very interesting area, but I also want to be able to talk to people.

? ? ? 73, Dan, N7DE? ?

From: [email protected] <[email protected]> on behalf of AndyH <awhecker@...>
Sent: Saturday, March 25, 2023 7:02 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.

I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn

On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?

From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua

--
Jack, W8TEE


 

开云体育

The RS918 is the Chinese copy of M0NKA's McHF.

Gerry Sherman

Sent by the Linux Thunderbird

On 2023-03-27 18:40, Siegfried Jackstien wrote:

nope .. its the second

first is/was mchf (and now its cloned from china)

i brought david and our programming group together ... rest is history :-)

the guy with the laptop on very right is me ;-)

i have often used freedv with pc on shortwave and i have found out that the freedv hardware solution .. smartmic .. sm1000 .. has an stm32 chip and the mchf also has that stm32 inside ... then i brought david rove in contact of our user group

dg9bfc sigi

Am 27.03.2023 um 01:35 schrieb Ashhar Farhan:
The digital voice mode that could possibly replace ssb is freedv. It is actually two things that work together.
First, the voice is converted into a stream of very few bits per second. A usual voice stream like that of telephone uses about 64,000 bits per second. Freedv codec reduces it to 700 bits per second. This is at the cost of reduced quality. However, it is much better that SSB on 80 meters.
The second thing is an HF modem that can work at 700 bits per second. This is a weird one. On HF as signals bounce off the ionosphere and arrive at the rx antenna, you can have a situation where the same signal can arrive taking different paths and hence at different times , overlapping itself. This reduces the number of times you can rapidly change the frequency of the signal. This is why FT8 works so well, it is so slow that fading, et al doesnt affect it. So, what the freedv modem does is that it transmits a number of parallel ft8 like signals as separate tones within the same audio which when added up give you higher bandwidth. There is a very impressive name for it that escapes me now.
Our plan is to add freedv into the sbitx, making it the the first radio to support it natively.
- f

On Sun, Mar 26, 2023, 11:53 PM Jack, W8TEE via <jjpurdum=[email protected]> wrote:
Gordon:

Either RadComm or Sprat had an article how students in England were fascinated by Morse code. When asked why, they replied that "voice" (SSB) didn't interest them because they could do that with their cell phone. But Morse was "better" because their parents couldn't understand what was being said.

Any port in a storm...

Jack, W8TEE

On Sunday, March 26, 2023 at 01:55:50 PM EDT, Gordon Gibby <docvacuumtubes@...> wrote:


Well, for several years now we have observed some thing very fascinating among middle schoolers in our local school.

They are not interested at all in walkie-talkies
They are not interested at all in HF radios
Don’t even get me thinking about digital.

What they absolutely go crazy over, what they will grab onto and play with until you have to pull them away kicking and screaming with their parents,

Is a Morse code key!!!

At every school open house that we hold we now always provide multiple Morse code keys and it is a big draw.

We will provide them at this year‘s field day

The news media always want a picture of someone sending Morse code

We have two 6th graders in a very small school that are already doing about 10 words per minute. I sent 30 minutes worth of code to them two weeks ago?

It is astonishing the attraction that Morse code has for these middle schoolers

Meanwhile, across town, at the school devoted to future police and fire high schoolers, they have an extremely active contesting high school I am radio club and I am told that their best operator can do over 30 words per minute and they routinely make hundreds and hundreds of contacts at voice and CW in contests. ?

Our local ham radio club would have a hard time beating them!!!!

So I wouldn’t quite give up yet. ?human nature is the same. And there are certain number of us who really love the auditory and tactile tickling that only Morse code gives…. And by the way it is the first digital, the only digital that can be decoded by the human brain without much else.? End it enjoys an order of magnitude or two advantage over voice In terms of threshold signal to noise ratio!!!?

On Mar 26, 2023, at 13:23, Dan Eggers N7DE <N7DE@...> wrote:

?
Thank you?for the information.? I see you and I are both CW old timers.? So far we have lost about half of the CW people without any real replacements coming along, but you and I came along during a certain era.

Best wishes.? ? ? ?73, Dan


From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 10:00 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
Eventually there will be something that replaces analog single side band voice. But it’s not yet here. ? And I think I have been doing CW for 55 years or more. ?

That’s my thought

Gordon Kx4z?



On Mar 26, 2023, at 11:51, Dan Eggers N7DE <N7DE@...> wrote:

?
I have been sending Morse code now for 57 years, and I will just continue to send Morse code, but since you seem to be very knowledgeable is there a digital voice modulation system that will eventually replace SSB?

Thank you.? ? ? ? ? 73, Dan, N7DE?

From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 8:42 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?

Single side band typically requires a 10 DB signal to noise ratio for useful communications in a disaster.? That is, the efficient transfer of information

My contrast, using the same base noise in that bandwidth, data communications of moderate speed can tolerate SNR into low single digits, and still move efficient communications far faster than voice

Low data rate redundant digital communications can tolerate signal to noise ratios a couple orders of magnitude lower SNR

These comparisons are widely available

It’s no secret why people who are very involved in the (voice) national traffic system often have kilowatt amplifiers. ?

And people who are into JS8 ?don’t need them

So there are different requirements for different parts of our hobby




On Mar 26, 2023, at 11:33, Dan Eggers N7DE <N7DE@...> wrote:

?
I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power conversion, and that is also a very interesting area, but I also want to be able to talk to people.

? ? ? 73, Dan, N7DE? ?

From: [email protected] <[email protected]> on behalf of AndyH <awhecker@...>
Sent: Saturday, March 25, 2023 7:02 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.

I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn

On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?

From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua

--
Jack, W8TEE


 

Sigi,
What a fun way to do it. It is so much more enlightening when you have a bunch of friends to do it with.
?I wish we could dumb down an ssb radio to the point that people with soldering skills could sit down with a bag of parts and solder it up over a few evenings. That was my attempt with the original bitx20. However, we seem to be moving to more and more complex radios that work less and less transparently.
Yesterday, while trying to debug a pesky problem on the new sbitx, I was cursing myself for not understanding how it works (after working on it for 4 years)...


On Tue, Mar 28, 2023, 4:19 AM Gerald Sherman <ve4gks@...> wrote:

The RS918 is the Chinese copy of M0NKA's McHF.

Gerry Sherman

Sent by the Linux Thunderbird

On 2023-03-27 18:40, Siegfried Jackstien wrote:

nope .. its the second

first is/was mchf (and now its cloned from china)

i brought david and our programming group together ... rest is history :-)

the guy with the laptop on very right is me ;-)

i have often used freedv with pc on shortwave and i have found out that the freedv hardware solution .. smartmic .. sm1000 .. has an stm32 chip and the mchf also has that stm32 inside ... then i brought david rove in contact of our user group

dg9bfc sigi

Am 27.03.2023 um 01:35 schrieb Ashhar Farhan:
The digital voice mode that could possibly replace ssb is freedv. It is actually two things that work together.
First, the voice is converted into a stream of very few bits per second. A usual voice stream like that of telephone uses about 64,000 bits per second. Freedv codec reduces it to 700 bits per second. This is at the cost of reduced quality. However, it is much better that SSB on 80 meters.
The second thing is an HF modem that can work at 700 bits per second. This is a weird one. On HF as signals bounce off the ionosphere and arrive at the rx antenna, you can have a situation where the same signal can arrive taking different paths and hence at different times , overlapping itself. This reduces the number of times you can rapidly change the frequency of the signal. This is why FT8 works so well, it is so slow that fading, et al doesnt affect it. So, what the freedv modem does is that it transmits a number of parallel ft8 like signals as separate tones within the same audio which when added up give you higher bandwidth. There is a very impressive name for it that escapes me now.
Our plan is to add freedv into the sbitx, making it the the first radio to support it natively.
- f

On Sun, Mar 26, 2023, 11:53 PM Jack, W8TEE via <jjpurdum=[email protected]> wrote:
Gordon:

Either RadComm or Sprat had an article how students in England were fascinated by Morse code. When asked why, they replied that "voice" (SSB) didn't interest them because they could do that with their cell phone. But Morse was "better" because their parents couldn't understand what was being said.

Any port in a storm...

Jack, W8TEE

On Sunday, March 26, 2023 at 01:55:50 PM EDT, Gordon Gibby <docvacuumtubes@...> wrote:


Well, for several years now we have observed some thing very fascinating among middle schoolers in our local school.

They are not interested at all in walkie-talkies
They are not interested at all in HF radios
Don’t even get me thinking about digital.

What they absolutely go crazy over, what they will grab onto and play with until you have to pull them away kicking and screaming with their parents,

Is a Morse code key!!!

At every school open house that we hold we now always provide multiple Morse code keys and it is a big draw.

We will provide them at this year‘s field day

The news media always want a picture of someone sending Morse code

We have two 6th graders in a very small school that are already doing about 10 words per minute. I sent 30 minutes worth of code to them two weeks ago?

It is astonishing the attraction that Morse code has for these middle schoolers

Meanwhile, across town, at the school devoted to future police and fire high schoolers, they have an extremely active contesting high school I am radio club and I am told that their best operator can do over 30 words per minute and they routinely make hundreds and hundreds of contacts at voice and CW in contests. ?

Our local ham radio club would have a hard time beating them!!!!

So I wouldn’t quite give up yet. ?human nature is the same. And there are certain number of us who really love the auditory and tactile tickling that only Morse code gives…. And by the way it is the first digital, the only digital that can be decoded by the human brain without much else.? End it enjoys an order of magnitude or two advantage over voice In terms of threshold signal to noise ratio!!!?

On Mar 26, 2023, at 13:23, Dan Eggers N7DE <N7DE@...> wrote:

?
Thank you?for the information.? I see you and I are both CW old timers.? So far we have lost about half of the CW people without any real replacements coming along, but you and I came along during a certain era.

Best wishes.? ? ? ?73, Dan


From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 10:00 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
Eventually there will be something that replaces analog single side band voice. But it’s not yet here. ? And I think I have been doing CW for 55 years or more. ?

That’s my thought

Gordon Kx4z?



On Mar 26, 2023, at 11:51, Dan Eggers N7DE <N7DE@...> wrote:

?
I have been sending Morse code now for 57 years, and I will just continue to send Morse code, but since you seem to be very knowledgeable is there a digital voice modulation system that will eventually replace SSB?

Thank you.? ? ? ? ? 73, Dan, N7DE?

From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 8:42 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?

Single side band typically requires a 10 DB signal to noise ratio for useful communications in a disaster.? That is, the efficient transfer of information

My contrast, using the same base noise in that bandwidth, data communications of moderate speed can tolerate SNR into low single digits, and still move efficient communications far faster than voice

Low data rate redundant digital communications can tolerate signal to noise ratios a couple orders of magnitude lower SNR

These comparisons are widely available

It’s no secret why people who are very involved in the (voice) national traffic system often have kilowatt amplifiers. ?

And people who are into JS8 ?don’t need them

So there are different requirements for different parts of our hobby




On Mar 26, 2023, at 11:33, Dan Eggers N7DE <N7DE@...> wrote:

?
I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power conversion, and that is also a very interesting area, but I also want to be able to talk to people.

? ? ? 73, Dan, N7DE? ?

From: [email protected] <[email protected]> on behalf of AndyH <awhecker@...>
Sent: Saturday, March 25, 2023 7:02 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.

I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn

On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?

From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua

--
Jack, W8TEE


Dan Eggers N7DE
 

开云体育

I thought that I could do everything myself when we were working with vacuum tubes, and when transistors came along early on it seemed like you could still do things yourself, but now with integrated circuits and firmware it is impossible to do everything yourself.? That is why I am grateful for all of you.

? ? ? ? ?73, Dan, N7DE


From: [email protected] <[email protected]> on behalf of Ashhar Farhan <farhanbox@...>
Sent: Monday, March 27, 2023 4:28 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
Sigi,
What a fun way to do it. It is so much more enlightening when you have a bunch of friends to do it with.
?I wish we could dumb down an ssb radio to the point that people with soldering skills could sit down with a bag of parts and solder it up over a few evenings. That was my attempt with the original bitx20. However, we seem to be moving to more and more complex radios that work less and less transparently.
Yesterday, while trying to debug a pesky problem on the new sbitx, I was cursing myself for not understanding how it works (after working on it for 4 years)...


On Tue, Mar 28, 2023, 4:19 AM Gerald Sherman <ve4gks@...> wrote:

The RS918 is the Chinese copy of M0NKA's McHF.

Gerry Sherman

Sent by the Linux Thunderbird

On 2023-03-27 18:40, Siegfried Jackstien wrote:

nope .. its the second

first is/was mchf (and now its cloned from china)

i brought david and our programming group together ... rest is history :-)

the guy with the laptop on very right is me ;-)

i have often used freedv with pc on shortwave and i have found out that the freedv hardware solution .. smartmic .. sm1000 .. has an stm32 chip and the mchf also has that stm32 inside ... then i brought david rove in contact of our user group

dg9bfc sigi

Am 27.03.2023 um 01:35 schrieb Ashhar Farhan:
The digital voice mode that could possibly replace ssb is freedv. It is actually two things that work together.
First, the voice is converted into a stream of very few bits per second. A usual voice stream like that of telephone uses about 64,000 bits per second. Freedv codec reduces it to 700 bits per second. This is at the cost of reduced quality. However, it is much better that SSB on 80 meters.
The second thing is an HF modem that can work at 700 bits per second. This is a weird one. On HF as signals bounce off the ionosphere and arrive at the rx antenna, you can have a situation where the same signal can arrive taking different paths and hence at different times , overlapping itself. This reduces the number of times you can rapidly change the frequency of the signal. This is why FT8 works so well, it is so slow that fading, et al doesnt affect it. So, what the freedv modem does is that it transmits a number of parallel ft8 like signals as separate tones within the same audio which when added up give you higher bandwidth. There is a very impressive name for it that escapes me now.
Our plan is to add freedv into the sbitx, making it the the first radio to support it natively.
- f

On Sun, Mar 26, 2023, 11:53 PM Jack, W8TEE via <jjpurdum=[email protected]> wrote:
Gordon:

Either RadComm or Sprat had an article how students in England were fascinated by Morse code. When asked why, they replied that "voice" (SSB) didn't interest them because they could do that with their cell phone. But Morse was "better" because their parents couldn't understand what was being said.

Any port in a storm...

Jack, W8TEE

On Sunday, March 26, 2023 at 01:55:50 PM EDT, Gordon Gibby <docvacuumtubes@...> wrote:


Well, for several years now we have observed some thing very fascinating among middle schoolers in our local school.

They are not interested at all in walkie-talkies
They are not interested at all in HF radios
Don’t even get me thinking about digital.

What they absolutely go crazy over, what they will grab onto and play with until you have to pull them away kicking and screaming with their parents,

Is a Morse code key!!!

At every school open house that we hold we now always provide multiple Morse code keys and it is a big draw.

We will provide them at this year‘s field day

The news media always want a picture of someone sending Morse code

We have two 6th graders in a very small school that are already doing about 10 words per minute. I sent 30 minutes worth of code to them two weeks ago?

It is astonishing the attraction that Morse code has for these middle schoolers

Meanwhile, across town, at the school devoted to future police and fire high schoolers, they have an extremely active contesting high school I am radio club and I am told that their best operator can do over 30 words per minute and they routinely make hundreds and hundreds of contacts at voice and CW in contests. ?

Our local ham radio club would have a hard time beating them!!!!

So I wouldn’t quite give up yet. ?human nature is the same. And there are certain number of us who really love the auditory and tactile tickling that only Morse code gives…. And by the way it is the first digital, the only digital that can be decoded by the human brain without much else.? End it enjoys an order of magnitude or two advantage over voice In terms of threshold signal to noise ratio!!!?

On Mar 26, 2023, at 13:23, Dan Eggers N7DE <N7DE@...> wrote:

?
Thank you?for the information.? I see you and I are both CW old timers.? So far we have lost about half of the CW people without any real replacements coming along, but you and I came along during a certain era.

Best wishes.? ? ? ?73, Dan


From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 10:00 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
Eventually there will be something that replaces analog single side band voice. But it’s not yet here. ? And I think I have been doing CW for 55 years or more. ?

That’s my thought

Gordon Kx4z?



On Mar 26, 2023, at 11:51, Dan Eggers N7DE <N7DE@...> wrote:

?
I have been sending Morse code now for 57 years, and I will just continue to send Morse code, but since you seem to be very knowledgeable is there a digital voice modulation system that will eventually replace SSB?

Thank you.? ? ? ? ? 73, Dan, N7DE?

From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 8:42 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?

Single side band typically requires a 10 DB signal to noise ratio for useful communications in a disaster.? That is, the efficient transfer of information

My contrast, using the same base noise in that bandwidth, data communications of moderate speed can tolerate SNR into low single digits, and still move efficient communications far faster than voice

Low data rate redundant digital communications can tolerate signal to noise ratios a couple orders of magnitude lower SNR

These comparisons are widely available

It’s no secret why people who are very involved in the (voice) national traffic system often have kilowatt amplifiers. ?

And people who are into JS8 ?don’t need them

So there are different requirements for different parts of our hobby




On Mar 26, 2023, at 11:33, Dan Eggers N7DE <N7DE@...> wrote:

?
I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power conversion, and that is also a very interesting area, but I also want to be able to talk to people.

? ? ? 73, Dan, N7DE? ?

From: [email protected] <[email protected]> on behalf of AndyH <awhecker@...>
Sent: Saturday, March 25, 2023 7:02 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.

I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn

On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?

From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua

--
Jack, W8TEE


 

开云体育

yes .. rs918 is mchf clone

but it was our group that included freedv in mchf and it WAS ME WHO HAD THE IDEA!!

dg9bfc sigi

Am 28.03.2023 um 00:49 schrieb Gerald Sherman:

The RS918 is the Chinese copy of M0NKA's McHF.

Gerry Sherman

Sent by the Linux Thunderbird

On 2023-03-27 18:40, Siegfried Jackstien wrote:

nope .. its the second

first is/was mchf (and now its cloned from china)

i brought david and our programming group together ... rest is history :-)

the guy with the laptop on very right is me ;-)

i have often used freedv with pc on shortwave and i have found out that the freedv hardware solution .. smartmic .. sm1000 .. has an stm32 chip and the mchf also has that stm32 inside ... then i brought david rove in contact of our user group

dg9bfc sigi

Am 27.03.2023 um 01:35 schrieb Ashhar Farhan:
The digital voice mode that could possibly replace ssb is freedv. It is actually two things that work together.
First, the voice is converted into a stream of very few bits per second. A usual voice stream like that of telephone uses about 64,000 bits per second. Freedv codec reduces it to 700 bits per second. This is at the cost of reduced quality. However, it is much better that SSB on 80 meters.
The second thing is an HF modem that can work at 700 bits per second. This is a weird one. On HF as signals bounce off the ionosphere and arrive at the rx antenna, you can have a situation where the same signal can arrive taking different paths and hence at different times , overlapping itself. This reduces the number of times you can rapidly change the frequency of the signal. This is why FT8 works so well, it is so slow that fading, et al doesnt affect it. So, what the freedv modem does is that it transmits a number of parallel ft8 like signals as separate tones within the same audio which when added up give you higher bandwidth. There is a very impressive name for it that escapes me now.
Our plan is to add freedv into the sbitx, making it the the first radio to support it natively.
- f

On Sun, Mar 26, 2023, 11:53 PM Jack, W8TEE via <jjpurdum=[email protected]> wrote:
Gordon:

Either RadComm or Sprat had an article how students in England were fascinated by Morse code. When asked why, they replied that "voice" (SSB) didn't interest them because they could do that with their cell phone. But Morse was "better" because their parents couldn't understand what was being said.

Any port in a storm...

Jack, W8TEE

On Sunday, March 26, 2023 at 01:55:50 PM EDT, Gordon Gibby <docvacuumtubes@...> wrote:


Well, for several years now we have observed some thing very fascinating among middle schoolers in our local school.

They are not interested at all in walkie-talkies
They are not interested at all in HF radios
Don’t even get me thinking about digital.

What they absolutely go crazy over, what they will grab onto and play with until you have to pull them away kicking and screaming with their parents,

Is a Morse code key!!!

At every school open house that we hold we now always provide multiple Morse code keys and it is a big draw.

We will provide them at this year‘s field day

The news media always want a picture of someone sending Morse code

We have two 6th graders in a very small school that are already doing about 10 words per minute. I sent 30 minutes worth of code to them two weeks ago?

It is astonishing the attraction that Morse code has for these middle schoolers

Meanwhile, across town, at the school devoted to future police and fire high schoolers, they have an extremely active contesting high school I am radio club and I am told that their best operator can do over 30 words per minute and they routinely make hundreds and hundreds of contacts at voice and CW in contests. ?

Our local ham radio club would have a hard time beating them!!!!

So I wouldn’t quite give up yet. ?human nature is the same. And there are certain number of us who really love the auditory and tactile tickling that only Morse code gives…. And by the way it is the first digital, the only digital that can be decoded by the human brain without much else.? End it enjoys an order of magnitude or two advantage over voice In terms of threshold signal to noise ratio!!!?

On Mar 26, 2023, at 13:23, Dan Eggers N7DE <N7DE@...> wrote:

?
Thank you?for the information.? I see you and I are both CW old timers.? So far we have lost about half of the CW people without any real replacements coming along, but you and I came along during a certain era.

Best wishes.? ? ? ?73, Dan


From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 10:00 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
Eventually there will be something that replaces analog single side band voice. But it’s not yet here. ? And I think I have been doing CW for 55 years or more. ?

That’s my thought

Gordon Kx4z?



On Mar 26, 2023, at 11:51, Dan Eggers N7DE <N7DE@...> wrote:

?
I have been sending Morse code now for 57 years, and I will just continue to send Morse code, but since you seem to be very knowledgeable is there a digital voice modulation system that will eventually replace SSB?

Thank you.? ? ? ? ? 73, Dan, N7DE?

From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 8:42 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?

Single side band typically requires a 10 DB signal to noise ratio for useful communications in a disaster.? That is, the efficient transfer of information

My contrast, using the same base noise in that bandwidth, data communications of moderate speed can tolerate SNR into low single digits, and still move efficient communications far faster than voice

Low data rate redundant digital communications can tolerate signal to noise ratios a couple orders of magnitude lower SNR

These comparisons are widely available

It’s no secret why people who are very involved in the (voice) national traffic system often have kilowatt amplifiers. ?

And people who are into JS8 ?don’t need them

So there are different requirements for different parts of our hobby




On Mar 26, 2023, at 11:33, Dan Eggers N7DE <N7DE@...> wrote:

?
I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power conversion, and that is also a very interesting area, but I also want to be able to talk to people.

? ? ? 73, Dan, N7DE? ?

From: [email protected] <[email protected]> on behalf of AndyH <awhecker@...>
Sent: Saturday, March 25, 2023 7:02 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.

I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn

On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?

From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua

--
Jack, W8TEE


 

开云体育

Well, I "paid my dues" in the homebrew department over 50 years ago.? A world war 2 ARC-5 TVI generator for the PA tube & socket, an old TV set for its power transformer, plate loading coil wound on a plastic pill vial, an old auto air filter gave the perforated metal for the PA tube compartment cover, I'm sure you get the picture.? I stick to operating these days & let the younger folks do the design & building.

Gerry Sherman

Sent by the Linux Thunderbird

On 2023-03-28 00:43, Siegfried Jackstien wrote:

yes .. rs918 is mchf clone

but it was our group that included freedv in mchf and it WAS ME WHO HAD THE IDEA!!

dg9bfc sigi

Am 28.03.2023 um 00:49 schrieb Gerald Sherman:

The RS918 is the Chinese copy of M0NKA's McHF.

Gerry Sherman

Sent by the Linux Thunderbird

On 2023-03-27 18:40, Siegfried Jackstien wrote:

nope .. its the second

first is/was mchf (and now its cloned from china)

i brought david and our programming group together ... rest is history :-)

the guy with the laptop on very right is me ;-)

i have often used freedv with pc on shortwave and i have found out that the freedv hardware solution .. smartmic .. sm1000 .. has an stm32 chip and the mchf also has that stm32 inside ... then i brought david rove in contact of our user group

dg9bfc sigi

Am 27.03.2023 um 01:35 schrieb Ashhar Farhan:
The digital voice mode that could possibly replace ssb is freedv. It is actually two things that work together.
First, the voice is converted into a stream of very few bits per second. A usual voice stream like that of telephone uses about 64,000 bits per second. Freedv codec reduces it to 700 bits per second. This is at the cost of reduced quality. However, it is much better that SSB on 80 meters.
The second thing is an HF modem that can work at 700 bits per second. This is a weird one. On HF as signals bounce off the ionosphere and arrive at the rx antenna, you can have a situation where the same signal can arrive taking different paths and hence at different times , overlapping itself. This reduces the number of times you can rapidly change the frequency of the signal. This is why FT8 works so well, it is so slow that fading, et al doesnt affect it. So, what the freedv modem does is that it transmits a number of parallel ft8 like signals as separate tones within the same audio which when added up give you higher bandwidth. There is a very impressive name for it that escapes me now.
Our plan is to add freedv into the sbitx, making it the the first radio to support it natively.
- f

On Sun, Mar 26, 2023, 11:53 PM Jack, W8TEE via <jjpurdum=[email protected]> wrote:
Gordon:

Either RadComm or Sprat had an article how students in England were fascinated by Morse code. When asked why, they replied that "voice" (SSB) didn't interest them because they could do that with their cell phone. But Morse was "better" because their parents couldn't understand what was being said.

Any port in a storm...

Jack, W8TEE

On Sunday, March 26, 2023 at 01:55:50 PM EDT, Gordon Gibby <docvacuumtubes@...> wrote:


Well, for several years now we have observed some thing very fascinating among middle schoolers in our local school.

They are not interested at all in walkie-talkies
They are not interested at all in HF radios
Don’t even get me thinking about digital.

What they absolutely go crazy over, what they will grab onto and play with until you have to pull them away kicking and screaming with their parents,

Is a Morse code key!!!

At every school open house that we hold we now always provide multiple Morse code keys and it is a big draw.

We will provide them at this year‘s field day

The news media always want a picture of someone sending Morse code

We have two 6th graders in a very small school that are already doing about 10 words per minute. I sent 30 minutes worth of code to them two weeks ago?

It is astonishing the attraction that Morse code has for these middle schoolers

Meanwhile, across town, at the school devoted to future police and fire high schoolers, they have an extremely active contesting high school I am radio club and I am told that their best operator can do over 30 words per minute and they routinely make hundreds and hundreds of contacts at voice and CW in contests. ?

Our local ham radio club would have a hard time beating them!!!!

So I wouldn’t quite give up yet. ?human nature is the same. And there are certain number of us who really love the auditory and tactile tickling that only Morse code gives…. And by the way it is the first digital, the only digital that can be decoded by the human brain without much else.? End it enjoys an order of magnitude or two advantage over voice In terms of threshold signal to noise ratio!!!?

On Mar 26, 2023, at 13:23, Dan Eggers N7DE <N7DE@...> wrote:

?
Thank you?for the information.? I see you and I are both CW old timers.? So far we have lost about half of the CW people without any real replacements coming along, but you and I came along during a certain era.

Best wishes.? ? ? ?73, Dan


From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 10:00 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
Eventually there will be something that replaces analog single side band voice. But it’s not yet here. ? And I think I have been doing CW for 55 years or more. ?

That’s my thought

Gordon Kx4z?



On Mar 26, 2023, at 11:51, Dan Eggers N7DE <N7DE@...> wrote:

?
I have been sending Morse code now for 57 years, and I will just continue to send Morse code, but since you seem to be very knowledgeable is there a digital voice modulation system that will eventually replace SSB?

Thank you.? ? ? ? ? 73, Dan, N7DE?

From: [email protected] <[email protected]> on behalf of Gordon Gibby <docvacuumtubes@...>
Sent: Sunday, March 26, 2023 8:42 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?

Single side band typically requires a 10 DB signal to noise ratio for useful communications in a disaster.? That is, the efficient transfer of information

My contrast, using the same base noise in that bandwidth, data communications of moderate speed can tolerate SNR into low single digits, and still move efficient communications far faster than voice

Low data rate redundant digital communications can tolerate signal to noise ratios a couple orders of magnitude lower SNR

These comparisons are widely available

It’s no secret why people who are very involved in the (voice) national traffic system often have kilowatt amplifiers. ?

And people who are into JS8 ?don’t need them

So there are different requirements for different parts of our hobby




On Mar 26, 2023, at 11:33, Dan Eggers N7DE <N7DE@...> wrote:

?
I used 20 watts for a long time, and I have had a number of people refuse to talk to me, because my signal was too week, so more power is needed.? I have written a booklet about solar cells, and maybe you use solar cells and power conversion, and that is also a very interesting area, but I also want to be able to talk to people.

? ? ? 73, Dan, N7DE? ?

From: [email protected] <[email protected]> on behalf of AndyH <awhecker@...>
Sent: Saturday, March 25, 2023 7:02 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
With respect, Dan, "need" isn't an actionable or useful concept, especially in QRP land.

I live on a sailboat and am currently in Tampa Bay. With a couple of meters of tinn

On Sat, Mar 25, 2023 at 01:55 PM, Dan Eggers N7DE wrote:
20 w is -7 dB, and that is too far down.? it is getting close to -10 dB down.? You need to be at 50 w, and that is only -3 dB down.? What I have used for low cost has been an MRF455 in an EB63A board from Communications Concepts, and it works very well.
?
However, the Chinese are selling a 100-w amplifier with a heatsink that has had the level set, and they also sell a lowpass filter board XDT LPF200 for 3 - 30 MHz at a reasonable price that works very well, so these days there really isn't any reason to "build your own" amplifier.?
?
The main thing I am saying is that you need more power so that you can be heard.? I went through enough Electrical Engineering courses that I am now an Electrical Engineer, but I do not think I am going to try design amplifiers from scratch myself.
?
I am very grateful for all of the people who helped produce the UBITX 6, because I think that has been the only low cost real general coverage transceiver that is out there.? ? ? ? ? ? ?73, Dan, N7DE
?

From: [email protected] <[email protected]> on behalf of Sunil Lakhani <vu3sua@...>
Sent: Friday, March 24, 2023 1:19 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bit40
?
Hi Ted
Thanks. Incidentally the FET is? IRFP150? And Not IRF150 , sorry for the typo.
I will edit at the end of the video..
The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V .
Regards
Sunil vu3sua

--
Jack, W8TEE