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

[sbjohnston at aol.com]

I found a crystal that worked in the FA-7989, and that in turn led me to discover that the trimmers visible behind the panel next to each crystal socket were actually trim-pots, not capacitors, and they don't adjust the frequency, they tune the front end for each channel.  So when I was supplying a substitute LO I needed to select and tune one of those pots to peak up the front end.  Interesting.


Steve WD8DAS   

sbjohnston at aol.com   
http://www.wd8das.net/   http://af4k-crystals.com/   
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    On Sunday, August 27, 2023 at 04:10:20 PM CDT, sbjohnston at aol.com <sbjohnston at aol.com> wrote:  
 
 
Yes.  I was surprised how very smooth it was except for the intermittent jumping up and down a volt or two when no battery was present.  


Steve WD8DAS   

sbjohnston at aol.com   
http://www.wd8das.net/   http://af4k-crystals.com/   
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Radio is your best entertainment value.   
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