[MRCA] QRP Military Radio Magic

[W2HX]

Impressive write up. Well done!


73 Eugene W2HX
My Youtube Channel: https://www.youtube.com/@w2hx/videos
 

-----Original Message-----
From: mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> On Behalf Of Anthony Clare
Sent: Wednesday, October 2, 2024 6:09 AM
To: mrca at mailman.qth.net
Subject: Re: [MRCA] QRP Military Radio Magic

Well, since it seems to be a hot topic on the list, I have attached a PDF of my instructions for installing the ProgRock 2 into the TRC-77.

Hopefully, the attachment will get through. If not, I will find some alternative means.

n3kcb

------ Original Message ------
Received: Tue, 01 Oct 2024 07:27:49 PM EDT
From: WA6BBQ via MRCA <mrca at mailman.qth.net>
To: "mrca at mailman.qth.net" <mrca at mailman.qth.net>
Subject: Re: [MRCA] QRP Military Radio Magic

Excellent discussion!

I put my order in for a few progrock2's. (already have a box full of their low pass filters, as yet unbuilt.)  TRC-77 will be one recipient, and I've got a pile of the old boat radios. Always thought it would be fun to move one onto 160M.

Thanks!
Jason WA6BBQ

>  I have really enjoyed all the QRP Labs kits I've built.  Just a 
> couple weeks ago I put a 10m WSPR beacon on the air from here on Kauai 
> using another Ultimate 3S kit and a low-pass-filter kit.  A 
> successful result and quite economical.
>
> I've used ProgRock2 devices several times as a crystal substitute, and 
> I'd like to share my experiences:
> -Â  The USB programming requires that you know how to use a terminal 
> program to talk on a USB port.
> - The output is a harmonic-rich square wave, so filtering may be 
> necessary in some applications.  QRP Labs has very inexpensive low 
> pass filter
kits
> that may be helpful.
> -Â  These are microcontroller/synthesizer modules and as such will 
> spray significant radio noise.  When used in a transceiver or 
> receiver you should be ready for some reception interference.  
> Shielding and
filtering
> the lines into the ProgRock2 can help, but remember you are directly 
> coupling the unit into your receiver.  If a birdie from the ProgRock2 
> happens to fall on a desired channel it might be a difficult problem.
> -Â  If you are considering using a ProgRock2 in an FM transmitter 
> application, you will need to make sure the rig uses phase modulation 
> and not direct-FM.  Direct FM wants to frequency modulate the crystal 
> oscillator, and if you use a ProgRock you can't do that.
>
> I don't want to discourage people about the ProgRock2 - it is a very 
> handy device and have successfully used them in projects.  But I have 
> also
been
> frustrated and given up on that approach.  It is important to realize
the
> reality of the situation and manage one's expectations.
>
>
> Steve WD8DASÂ Â
>
> sbjohnston at aol.com Â
> http://www.wd8das.net/Â Â  http://af4k-crystals.com/Â Â
>
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> Radio is your best entertainment value. Â
>
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>
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