My Cobra 25LTD, the back-up radio I used on my trip to SC and back has no modulation all of a sudden. The last time I was heard by somebody was in NC when I got a radio check; no problems with audio then. Once home, I connected to a Dosey meter to check the AVG and PEAK readings and then MOD % - I was only able to read the power output (3 watts dead key), the modulation meter didn't move at all. I tested the mic and the Dosey with 2 other radios and everything worked as it should. The PA circuit works OK too.
The XMT light lights up and the meter moves on the 25 when I key up, but there is nothing heard when monitoring from another CB radio (the meter indicates a received carrier but there is no sound). I checked for loose connections/solder joints on both sides of the board and I tested the CB/ANL - PA switch with a VOM and all is OK. The MIC jack is OK - no loose/broken wires and the PA circuit works with the MIC GAIN as well.
I am leaning towards a defective component at this point, but I need a direction to go in to find the culprit(s). As always, any/all help would be appreciated. Thanks.
Mike
The XMT light lights up and the meter moves on the 25 when I key up, but there is nothing heard when monitoring from another CB radio (the meter indicates a received carrier but there is no sound). I checked for loose connections/solder joints on both sides of the board and I tested the CB/ANL - PA switch with a VOM and all is OK. The MIC jack is OK - no loose/broken wires and the PA circuit works with the MIC GAIN as well.
I am leaning towards a defective component at this point, but I need a direction to go in to find the culprit(s). As always, any/all help would be appreciated. Thanks.
Mike