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Recent content by Mike Stand

  1. M

    TRC-449 - weak AM receive, no SSB output

    Your RX problem is probably TR5, the first RF amp blown, it’s a 2sc1730L, common cause of weak RX.
  2. M

    TRC-449 - weak AM receive, no SSB output

    Try changing the relay, it switches the 13.8v supply on for SSB TX, wheras AM is controlled by a seperate regulator.
  3. M

    Cobra 139xlr low SSB power.

    Hi all, I’m struggling with the 139xlr. It has low tx power about 6W SSB. New final and driver, all electors replaced and all green caps in driver/final stage. It seems to be some sort of output tuning issue, the last coil adj after the final has the slug screwed just about all the way out to...
  4. M

    Cobra 140 GTL Audio Issues (Hiss/Static)

    I have just finished fixing a similar problem, on an 8719 Washington, slowly rising noise in RX with volume off. I replaced C109 to fix the issue. Strange thing is, the schematic shows it as a 0.1 tantalum. Mine had a 22uf tantalum. I replaced it with a 22uf electro and it’s fine now...