Question about Cobra 148 GTL 120-Channels Base CB Radio
Everyone tells me that they can hear me good on am and ssb very good but i can;t get any sound comeing out of it or no incomeing sight on the meter the meter don;t not move any even if i key a other cb up sitting right next to it could you tell me what to look for or what to change to fix this i really do like my cobra 2000 and would like to see it playing on the air again thanks for any help
Because you have transmit, more than likely your audio section is OK as much of it is shared with the receive side. A final test of the audio section is to check out the PA function. If it works most of the audio section has been tested.
The signals for the meter movement and receiver sound are developed in the audio detector circuit (diodes D21 and D22) just past the I.F. stages (Transistors TR16, TR17, and TR18). I have seen these diodes fail. They are frail little guys, but are inexpensive. I would recommend replacing them first. Pay particuliar attention to which way the band on the diode is positioned and limit your soldering time. If that does'nt rectify the problem, (no pun intended) you can look at the transitors.
By the way, MOVE that second test radio farther away or you could overload the front end of your Cobra creating even more problems. Good Luck, 302
Posted on Nov 29, 2007
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