Sorry to see Chuck close QRP-Tech, let's see where this group goes.
Sorry to see Chuck close QRP-Tech, let's see where this group goes.
I will miss Chuck's posting.
cheers, Graham ve3gtc
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Re: Sorry to see Chuck close QRP-Tech, let's see where this group goes.
What happened? ?I did not understand his last sudden message??
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Re: Sorry to see Chuck close QRP-Tech, let's see where this group goes.
I don't know. His last posting was a surprise.
He was never one to suffer fools so your guess is as good as mine.?
We may never know.
cheers, Graham ve3gtc
What happened?? I did not understand his last sudden message??
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Re: Sorry to see Chuck close QRP-Tech, let's see where this group goes.
Read the DSB thread, it's all there.
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Re: Sorry to see Chuck close QRP-Tech, let's see where this group goes.
the group will miss him, he did do a lot of projects technically oriented
Al VE3GAM
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Re: Sorry to see Chuck close QRP-Tech, let's see where this group goes.
Yes, he did everything he could to keep the building aspect of the hobby alive.? But we all ride off into the sunset eventually. He deserves our gratitude for the enormous amount of work he put into qrp-tech.
Jerry AA6KI
Tucson
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good to see new group to move to
Well, things do change and I think Chuck had his mind in a few camps at once. As it was (and is) a physicist for a long time it is good to see that he still feels he wants to and can still contribute to that. There is only so much time for each of us to do what we feel we want and need to.
In any case, Chuck contributed a lot to QRP-L list and then QRP Tech, so it is not as if he owes any more. The torch can go to others to be carried.
Obviously, given what Bill Meara, Pete Juliano, Hans @ QRP Labs and many more others are doing to keep home brewing and radio dreaming going there is still a lot to be said, done and explored in small signal radio. Welcome us all to the march onward.
Brien Pepperdine
VE3VAW
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Do you have a favorite home brew short wave receiver to build with scouts?
Do you have a favorite home brew short wave
receiver to build with scouts?
I wanted to kit crystal radios for the local
kids? and concluded that simple crystal radios got very little
bang for the buck.
Even when finding cheap Russian germanium diodes
for 5 cents.....??? variable capacitors and crystal headphones
cost too much.
I played with a few ideas here:
and then studied regenerative circuits:
and then made the? DIRECT CONVERSION RECEIVER EXPERIMENT
DESIGNED BY CHUCK ADAMS DECEMBER 2017
FOR THE /g/qrp-tech FORUM
This definitely was my first 40 meter CW radio that had wide
frequency selection and
did not suck in the local AM radio stations.... political rants
and preachers and sports talk radio...... ? ?? all the things
parents don't need to hear in a kid's first radio circuit.
Have any of you guys got a recommendation of what to build with
the kids?
Noting that I can easily make PCBs or mailorder PCBs for 50 cents
each
so I am looking for a circuit.... not really caring if its
already a kit or not
and I don't like to give the kids crazy glue for Manhattan style.
73 Rob KB3BYT
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Re: Do you have a favorite home brew short wave receiver to build with scouts?
Hi Rob,
I have a schematic for a good DC receiver here:
I wrote that up to explain fully how it works as well, which may or may not be of value to you. It wouldn't be a big deal to make a PCB for it, either. I used a QRP Labs VFO on mine, but you could just as easily use crystal control or some other means of inexpensive frequency control that doesn't include building a VFO from scratch. Perhaps a ceramic resonator that could be bent a few khz either direction? I'm sure others can chime in with better suggestions. 73!
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Re: Do you have a favorite home brew short wave receiver to build with scouts?
Rob,?
I watch the Internet for radio kits and accessory kits, and list them at It's currently in need of an update, but there are some offerings to consider.
A great kit supplier for what you're looking for is Mike's Electronic Parts:?? Mike has the supplies you're looking for, and a lot of MK-484 based designs (as well as many MK-484 derivatives and work-alikes)? MK-484 radios are great for beginners because they perform so well that you get listenable results.? The 4SQRP Club Murania AM radio kit is also MK-484 based.
Another place to look is the eBay seller?
24hrsradioshop:? They have a lot of components and some simple kits.? If you browse around their offerings they even have learning-style AM radio kits similar ti the Elenco offerings.
For Shortwave options, regen kits are fun, but can be frustrating?to tune for the beginner.? If you want to try that anyway though, there are regen offerings at QRP-GUYS.com, QRPKITS.com, and?
Good luck with the scouts!
--Neil, W2NDG
"beware of closeout parachutes"
Do you have a favorite home brew short wave
receiver to build with scouts?
I wanted to kit crystal radios for the local
kids? and concluded that simple crystal radios got very little
bang for the buck.
Even when finding cheap Russian germanium diodes
for 5 cents.....??? variable capacitors and crystal headphones
cost too much.
I played with a few ideas here:
and then studied regenerative circuits:
and then made the? DIRECT CONVERSION RECEIVER EXPERIMENT
DESIGNED BY CHUCK ADAMS DECEMBER 2017
FOR THE /g/qrp-tech FORUM
This definitely was my first 40 meter CW radio that had wide
frequency selection and
did not suck in the local AM radio stations.... political rants
and preachers and sports talk radio...... ? ?? all the things
parents don't need to hear in a kid's first radio circuit.
Have any of you guys got a recommendation of what to build with
the kids?
Noting that I can easily make PCBs or mailorder PCBs for 50 cents
each
so I am looking for a circuit.... not really caring if its
already a kit or not
and I don't like to give the kids crazy glue for Manhattan style.
73 Rob KB3BYT
-- Neil Goldstein ?W2NDG ?WQXD361
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I am deigning/building a DDS VFO for the NorCal40 and NorCal Sierra.
?
The 49er DDS VFO could be used for both of these trancievers.
?
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
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Hi Bob,
That’s great. ?Are you using the Si5351 as the DDS? ?If you are that makes Things easier in that It can be used for both as the LO at the RF mixer and BFO for the IF mixer.
I’m interested to see what you come up with. :)
72,
Faisal VA3SFA
?
toggle quoted message
Show quoted text
On 2019-11-05 15:06, Bob Macklin wrote:
?
I am deigning/building a DDS VFO for the NorCal40 and NorCal Sierra.
?
The 49er DDS VFO could be used for both of these trancievers.
?
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
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I have qrp-tech boards that need building, a DDS VFO would be great!
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Hi
Please not that the Si5351A is not a DDS. It is a synthesizer. BIG technological difference.
Bo
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The design is for either the QRP Labs SI 5351 module or the AD9850 Type I module.I am planning firmware for both.
?
I use serial LCDs. I use Newhaven LCD modules. If I must use a parallel LCD I use a serial to parallel adapter.
The parallel LCDs tale too many pins.
?
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
toggle quoted message
Show quoted text
----- Original Message -----
Sent: Tuesday, November 05, 2019 7:49 AM
Subject: Re: [qrptech] DDS VFO!
Hi Bob,
That’s great. ?Are you using the Si5351 as the DDS? ?If you are that makes Things easier in that It can be used for both as the LO at the RF mixer and BFO for the IF mixer.
I’m interested to see what you come up with. :)
72,
Faisal VA3SFA
?
On 2019-11-05 15:06, Bob Macklin wrote:
?
I am deigning/building a DDS VFO for the NorCal40 and NorCal Sierra.
?
The 49er DDS VFO could be used for both of these trancievers.
?
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
|
If you can find a 49er VFO you could use that.
?
I don't like the QRP Labs VFO because the serial port is not available and it uses a parallels.
?
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
toggle quoted message
Show quoted text
----- Original Message -----
Sent: Tuesday, November 05, 2019 9:03 AM
Subject: Re: [qrptech] DDS VFO!
I have qrp-tech boards that need building, a DDS VFO would be great!
|
Why does that matter? It accomplishes the same thing if you use the digital
output of the 9850.
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
toggle quoted message
Show quoted text
----- Original Message ----- From: "Bo, OZ2M" <groups.io@...> To: < [email protected]> Sent: Tuesday, November 05, 2019 9:16 AM Subject: Re: [qrptech] DDS VFO! Hi Please not that the Si5351A is not a DDS. It is a synthesizer. BIG technological difference. Bo
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Hi
Differences among other things:
- A DDS is way faster than a synthesizer
- A DDS has, often, better frequency resolution
This being said if the choice is between an AD9850 and the Si5351A I will opt for the latter any time. NEC used an AD9850 in one of their HF receivers but only to max 5 MHz due to its poor performance. Later generation of DDSes are much better. I have worked a lot with both the AD9912 DDS and the Si5351A
Bo
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Arduino (uno or nano) , SI5351(many sources), 2 line by 16 char LCD(many many sources).
That will do it all very acceptable and the code to do that is out there.? Its good
to VHF.
The ad9850 is a very old part and has not enough bits to do higher frequencies
cleanly so it has spurs that show up be it digital out or analog.
FYI the 49er VFO design, the supplier apparently stopped making it.
Allison
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On Tue, Nov 5, 2019 at 11:52 AM, ajparent1/kb1gmx wrote:
FYI the 49er VFO design, the supplier apparently stopped making it.
Are you talking about the Jack Purdum / Farrukh Zia board? If so Jack mentioned in the SoftwareControlledHamRadio group that there are lots of boards out there based on their design. Might be worth looking into as Farrukh has gone somewhat MIA. I have one of these kits and a 49er kit from eBay but if it will work with the 40A I may just have to save the VFO board for that!
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Troy - K4JDA
bleepingbeep
Neil Goldstein
Bo, OZ2M