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Cobra 142GTL No Transmit or Receive

CSA1863

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Joined
Jun 1, 2025
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I have a 142GTL with no transmit or receive. Radio powers up. Can key the mic and the transmit light come on but no rf out. I have checked the voltage on pin 6 of the PLL and have 8.25v. Pin 8 is reading 10.238 MHz. There is rf voltage at TP1. There is 4.8v at TP9.

The problem seems to be in the VCO as the frequency at TP1 is 70.485 on Channel 40 where it should be 35.205.

Voltages on the VCO/Mixer IC UHIC-007 look right.

Radio has what looks to be a expo 100 channel mod and the clarifier mod.

Electrolytic capacitors have been replaced.

Any help would be greatly appreciated
Thanks!
 

WSAC829

Mike Oscar 225
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Jan 13, 2024
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Probably wont help, but worth a shot. Get some Deoxit and spray all the front panel pots and switches really good. Work them back and forth a few times. I’m just wondering if your CB/PA switch is dirty and internally “stuck” in PA mode even if it’s in the CB position. The radio wont RX or TX in PA mode.
 
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