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HT ceramic Mic

Discussion in 'Electronic Repair' started by Jamie, Jan 6, 2009.

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  1. Jamie

    Jamie Guest

    I don't do a lot of repair work these days how ever,
    I have an HT the user/owner complains about low audio
    on TX.
    I don't have a real service manual but I do have the
    original print that comes with the HT. This is a
    Standard dual band, HeathKit also made one of the same thing.

    Now, I can turn up the drive levels via pots that are
    on the board for the VHF and UHF how ever, I don't see why
    I should have to do this. Changing it from the original set
    point to correct a failure somewhere isn't my cup of tea.

    Since I don't have the real service print to go by, I don't
    know exactly what is suppose to be at the varicap diode section
    of the exciter oscillators for the UHF and VHF.

    For an average level of audio into the mic of the HT, I'm
    getting ~ 150..200 mv PP into the varicap diode section of the

    To me, the audio level appears to be fine, the service
    monitor appears to show it's spread is with in normal limits.

    The only think I can think of is a bad ceramic element in the
    2 wired condenser mic.

    Do those things go bad by producing poor/low quality audio ?

    I'm thinking this may be more of a clarity issue, than
    anything else.

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