My 10m FM monitor (modified old CB transceiver) lost its audio out a few days ago.
I waited starting the repair until I had some of the 23cm equipment better tested. As that has now happened I took the rig up to the lab and made a quick test.
Most of the receiver looked like it was working, as the S-meter acted normally, so the fault seemed to be in the audio output system.
Sure enough, when I had the rig open and rocked the output electrolytic capacitor the audio speaker went on and off.
Looking at the bottom of the TRX it looked like there was a dry solder point. I re-soldered the capacitor and the wire going to the speaker/jack, and all sounds normal.
It is possible that the electrolytic capacitor has gone bad. If that turns out to be the case, the fault is a known one, and I may change all the electrolytic capacitors in the TRX.
The TRX is a nice addition to the 10m monitoring, as signals will sometimes come through when nothing else is heard by casual monitoring, or even systematic monitoring on fixed frequencies.
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