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Easy 20 Watts with any qrp #bitx40

 

Hi Friends?

I tried using a single IRF 150 with a drive of 200mv and 35 volts from a voltage booster and here is the video which shows Easy Bitx 40 pushing out 20 watts .


Regards?
Sunil vu3sua
 

IMD?
power is ok but what is IMD level?


On Thu, Mar 23, 2023 at 7:13?AM Sunil Lakhani <vu3sua@...> wrote:
Hi Friends?

I tried using a single IRF 150 with a drive of 200mv and 35 volts from a voltage booster and here is the video which shows Easy Bitx 40 pushing out 20 watts .


Regards?
Sunil vu3sua



--
Md Sofiullah
Assist. Manager
Pulse e Technologies Pvt. Ltd,
222, Phase-IV, Udyog Vihar,
Gurgaon-122015, Haryana
Cell: +91 9811842473
???????? +91 9654698929
 

What was your source for those IRF150's?? Looks like an interesting experiment.


 

Is it IRF 150 or IRF510?
Jack, W8TEE
 

IRF510

Jack, W8TEE

On Thursday, March 23, 2023 at 01:02:57 PM EDT, Rob Bleumer <rob.bleumer@...> wrote:


Is it IRF 150 or IRF510?

--
Jack, W8TEE
 

No, actually he is using a IRF150,

Joel
N6ALT
 

Sunil,
That looks like a fun kit even without the power mod.? When do you expect to have it back in stock?
--

 

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
 

Hi Doug

The easy bitx kit version 1 and version 2 are ready. By this weekend we shall update the availability .
Also we are listing the Airpal 2 band tcvr.

Thanks
Sunil vu3sua
 

Hi Sof
I have not done that analysis . maybe some other guys can dive deeper.
Regards

Sunil vu3sua
 

IRFP 150? Harris
 

IRFP150
 

"The FET i have used is Harris IRFP 150
It works great with not much heat at 35 V ."

Thanks.? I'll look for that.



-Ted
 

With a gate input capacitance of 2800pf it must be bear to drive.

I've run IRF510s at 24V and for HF 25watts is easy for only one device
with two push-pull 50-55w is a safe limit..

--
Allison
------------------
Please use the forum, offline and private will go to bit bucket.
Dan Eggers N7DE
 

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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

 

Some people like to experiment and build stuff from scratch or buy a kit and experiment with that so that they can learn something. Not everyone wants to use 100 Watt transmitters. So there is a reason to build your own. I'm an EE and I don't buy commercial HF HAM equipment because I can build it myself or buy something like Farhan's sbitx kit to experiment with. I can imagine that someday, discreet HF transistors and other parts are no longer being made and all HAMs end up as appliance operators. Ugh!. Until then, I can enjoy building stuff just for the joy it.
--
Jerry Ponko, AC9NM
Dan Eggers N7DE
 

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I have been sending Morse code now for 57 years, and I will just continue sending, but I do have one request.? I would like to see you, and others, work on making a transceiver that does not require any lowpass filters.? I would like you generate a Single Side Band (SSB) output digitally at full power, and that would preobably involve at least 100 MHz, or more, at full power.? That should only require one filter say at 30 MHz.? That would be similar to the way that they do Class D amplification of audio.? I think that is the next step in Amateur Radio RF.

? ? ? ?73, Dan, N7DE

From: [email protected] <[email protected]> on behalf of JerryP <jponko@...>
Sent: Saturday, March 25, 2023 1:07 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
Some people like to experiment and build stuff from scratch or buy a kit and experiment with that so that they can learn something. Not everyone wants to use 100 Watt transmitters. So there is a reason to build your own. I'm an EE and I don't buy commercial HF HAM equipment because I can build it myself or buy something like Farhan's sbitx kit to experiment with. I can imagine that someday, discreet HF transistors and other parts are no longer being made and all HAMs end up as appliance operators. Ugh!. Until then, I can enjoy building stuff just for the joy it.
--
Jerry Ponko, AC9NM

 

开云体育

Speaking of class D amplifiers, are you aware of K7DDY's legal-limit AM transmitter that uses a class D amplifier?


He offers 160/80 meter and 80/40 meter models.

Yes, I realize that AM is the polar-opposite of CW...

Ken, N2VIP

On Mar 25, 2023, at 16:16, Dan Eggers N7DE <N7DE@...> wrote:

?
I have been sending Morse code now for 57 years, and I will just continue sending, but I do have one request.? I would like to see you, and others, work on making a transceiver that does not require any lowpass filters.? I would like you generate a Single Side Band (SSB) output digitally at full power, and that would preobably involve at least 100 MHz, or more, at full power.? That should only require one filter say at 30 MHz.? That would be similar to the way that they do Class D amplification of audio.? I think that is the next step in Amateur Radio RF.

? ? ? ?73, Dan, N7DE

From: [email protected] <[email protected]> on behalf of JerryP <jponko@...>
Sent: Saturday, March 25, 2023 1:07 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
Some people like to experiment and build stuff from scratch or buy a kit and experiment with that so that they can learn something. Not everyone wants to use 100 Watt transmitters. So there is a reason to build your own. I'm an EE and I don't buy commercial HF HAM equipment because I can build it myself or buy something like Farhan's sbitx kit to experiment with. I can imagine that someday, discreet HF transistors and other parts are no longer being made and all HAMs end up as appliance operators. Ugh!. Until then, I can enjoy building stuff just for the joy it.
--
Jerry Ponko, AC9NM

Dan Eggers N7DE
 

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No.? I was not aware of that.? I am also licensed as a Broadcast Engineer, and we have a 100,000 watt FM station here in Pharr, TX? KVMV.? What I had in mind was one sideband without the other sideband and the carrier.? However, if you can do one, then I think you can do the other also.? I run CW on 40 m and 20 m to an off center fed dipole, so I would want more than 80 & 40, but I am real glad to know that there is someone out there doing class D amplifiers.

? ? ? ? ? 73, Dan, N7DE

From: [email protected] <[email protected]> on behalf of Ken N2VIP <ken@...>
Sent: Saturday, March 25, 2023 2:22 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
Speaking of class D amplifiers, are you aware of K7DDY's legal-limit AM transmitter that uses a class D amplifier?


He offers 160/80 meter and 80/40 meter models.

Yes, I realize that AM is the polar-opposite of CW...

Ken, N2VIP

On Mar 25, 2023, at 16:16, Dan Eggers N7DE <N7DE@...> wrote:

?
I have been sending Morse code now for 57 years, and I will just continue sending, but I do have one request.? I would like to see you, and others, work on making a transceiver that does not require any lowpass filters.? I would like you generate a Single Side Band (SSB) output digitally at full power, and that would preobably involve at least 100 MHz, or more, at full power.? That should only require one filter say at 30 MHz.? That would be similar to the way that they do Class D amplification of audio.? I think that is the next step in Amateur Radio RF.

? ? ? ?73, Dan, N7DE

From: [email protected] <[email protected]> on behalf of JerryP <jponko@...>
Sent: Saturday, March 25, 2023 1:07 PM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Easy 20 Watts with any qrp #bitx40
?
Some people like to experiment and build stuff from scratch or buy a kit and experiment with that so that they can learn something. Not everyone wants to use 100 Watt transmitters. So there is a reason to build your own. I'm an EE and I don't buy commercial HF HAM equipment because I can build it myself or buy something like Farhan's sbitx kit to experiment with. I can imagine that someday, discreet HF transistors and other parts are no longer being made and all HAMs end up as appliance operators. Ugh!. Until then, I can enjoy building stuff just for the joy it.
--
Jerry Ponko, AC9NM

 

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

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