I have a cobra 29 nw and it will transmit but you cant hear anything when receiving back.
If the meter shows that it's receiving something, the microphone may be the problem. Another possibility is the speaker & plugging an external speaker in would confirm this. Aslo make sure the squelch control is turned all the way to the left (counter-clockwise) & the RF gain is turned to the right (clockwise).
Put an external speaker on the PA jack, switch to PA to see if there is audio or feedback when you key up the mike. If not IC is gone. If you have audio you either have a broken connection at the Ext Spkr jack or a broken wire on your microphone.
The audio IC mentioned below is also used as the modulator when transmitting, so it must be OK.
So problem most likely is the speaker jack, switch it with the PA jack. In very few cases the re is a problem from the microphone jack to the circuit board but this is unlikely. The pins on the microphone jack may need to spread out slightly (if they're the split type). I trust you have checked it with a good microphone (Cobra or Uniden).
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