[ARC5] Working on the FA-7989 / TRX-102

[Bob Camp]

Hi

Things like phase noise also become more significant as you head up to VHF or UHF. There
may be multiple issues to deal with using a crystal substitute that is targeted for HF applications.

Bob

> On Aug 29, 2023, at 10:32 AM, sbjohnston--- via ARC5 <arc5 at mailman.qth.net> wrote:
> 
> Once I confirmed that the FA-7989 received well with a random crystal, I decided to take the opportunity to try the QRP Labs ProgRock2 as a "crystal substitute" to receive some local frequencies.  I'd ordered several of these programmable oscillators and this was a good excuse to program one and see how it worked.
> 
> The tiny unit programmed easily via USB on my Windows 10 laptop.  I set it up to run in place of the local oscillator on three of the local aviation frequencies.  I hooked it up and was almost instantly hearing aero traffic.  
> 
> One problem:  self interference.  The ProgRock2 had enough spurious outputs that it was interfering with the reception of the desired signals.  I did not determine if the signals were spraying from the board or were present on the output - probably both.  I met my goal of working with these programmable oscillators but in this VHF application I think the ProgRock2 will need to be in a shielded box with a filter on the output.  
> 
> 
> 73   Steve  WD8DAS
> 
> sbjohnston at aol.com   
> http://www.wd8das.net/   <http://www.wd8das.net/>
> http://af4k-crystals.com <http://af4k-crystals.com/>/   
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