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Recent content by silverhead

  1. silverhead

    In over my head with a Cobra 29 that I killed transmit on.

    Drum roll.... It was the driver transistor. The radio is back in service.
  2. silverhead

    In over my head with a Cobra 29 that I killed transmit on.

    The question I asked was about my radio which hadn't been hooked up to the Mauldulator at the time it was damaged. I have a 30vdc up-converter to power the Mauldulator and have it set at about 18 volts right now. I'm using a different Cobra 29 with it and I have the carrier set at 1 watt...
  3. silverhead

    In over my head with a Cobra 29 that I killed transmit on.

    I may have figured out what potentially ruined the driver and/or final. Tonight I was using a brand new 29 from my pickup as a reference radio. I checked the receive and transmit voltages on IC3, TR16, TR15, and TR14. Everything was pretty much a match between the two except for the...
  4. silverhead

    In over my head with a Cobra 29 that I killed transmit on.

    If I unsolder them there is no continuity from the modulation to the amplification. I physically cut the trace in the circuit board for my Mauldulator install. That circuit had been working for a few days before this happened. I checked all around those wires for shorts and proper continuity...
  5. silverhead

    In over my head with a Cobra 29 that I killed transmit on.

    Hey there, first post, long time random looker... I have a circa 2015 Cobra 29 that has lost transmit, presumably because of me. I've got a Swiss cheese, generalized knowledge of electronics, but not a great understanding of circuit tracing and fault finding. So here we are with my back...