This is an odd one to me. Hoping someone can point me in the right direction.
I used another radio and I hear that the cobra 29 LTD chrome is transmitting. I also see on the meter that I'm getting RX from the other radio. When I turn the radio on I get a pop so I know the speaker is good and connected. I can also hear the factory talkback thru the speaker. Still, no RX sounds. I hooked up my Sig Gen and Freq counter and I can see signal getting to the meter and its TX on freq.
I've done a little tracing with my Signal Tracer back from the SO239 and I've got RX all the way to the Ext Speaker jack, also if I connect my Tracer to the speaker wires I have sound.??? It didn't make sense but I replaced the speaker and that didn't help. When I plug in an ext speaker I still get no sound!
I pulled TR13 and then got sound so I tried replacing TR13 and back to nothing. I've worked the hell out of the control pots as This radio was in a dirt truck and was covered in dirt and dust. Controls are now no longer scratchy and the RF Gain pot seems to be working along with the volume. At least when I connect my signal tracer to the speaker wires, BUT, Squelch doesn't work at the speaker wires with my signal tracer connected. Not sure why I can get sound (AF) with my Tracer connected but not a speaker.
I'm leaning towards the Squelch circuit but it's just a feeling. I'm about lost and am dumfounded in where to go next. Anyone run across something like this before? Can you help get me back on track to find the reason I get no RX sound? I've flexed the board trying to find a broken trace and have spent some time staring at the traces and solder joints and see nothing bad going on. Even touched up a few that I wasn't completely happy with.
Help, please. I don't want this radio to go into the parts box as whatever it is I feel it's simple. I'm just overlooking something.
Jerry...
I used another radio and I hear that the cobra 29 LTD chrome is transmitting. I also see on the meter that I'm getting RX from the other radio. When I turn the radio on I get a pop so I know the speaker is good and connected. I can also hear the factory talkback thru the speaker. Still, no RX sounds. I hooked up my Sig Gen and Freq counter and I can see signal getting to the meter and its TX on freq.
I've done a little tracing with my Signal Tracer back from the SO239 and I've got RX all the way to the Ext Speaker jack, also if I connect my Tracer to the speaker wires I have sound.??? It didn't make sense but I replaced the speaker and that didn't help. When I plug in an ext speaker I still get no sound!
I pulled TR13 and then got sound so I tried replacing TR13 and back to nothing. I've worked the hell out of the control pots as This radio was in a dirt truck and was covered in dirt and dust. Controls are now no longer scratchy and the RF Gain pot seems to be working along with the volume. At least when I connect my signal tracer to the speaker wires, BUT, Squelch doesn't work at the speaker wires with my signal tracer connected. Not sure why I can get sound (AF) with my Tracer connected but not a speaker.
I'm leaning towards the Squelch circuit but it's just a feeling. I'm about lost and am dumfounded in where to go next. Anyone run across something like this before? Can you help get me back on track to find the reason I get no RX sound? I've flexed the board trying to find a broken trace and have spent some time staring at the traces and solder joints and see nothing bad going on. Even touched up a few that I wasn't completely happy with.
Help, please. I don't want this radio to go into the parts box as whatever it is I feel it's simple. I'm just overlooking something.
Jerry...