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mike socket chassis pin question

Discussion in 'General Electronics' started by RB, Feb 17, 2006.

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  1. RB

    RB Guest

    I have an older solid state scanning marine VHF radio I'm trying to get
    going again, after years of non-use.

    The mike is missing. These radios all used a simple PTT mike---a common
    ground, 12+ to one side of the PTT switch, and the audio from one side of
    the mike element on the other. Three wires total. I'd like to put a plug
    on a CB mike I have and use that for the marine VHF. I have no manual or
    schematic, and little chance of finding one (I'm searching).

    The chassis mike socket has 5 pins. I can easily find the ground pin. By
    powering the set up, I can then find the 12v+ pin. That takes care of two
    of my three wires in the mike cable.

    Question being, then, how do I determine which of my remaining 3 pins is for
    the audio lead?
  2. Jasen Betts

    Jasen Betts Guest

    if the two extra pins aren't for scan up/scan down and don't also read 12V with
    the set powered up

    select the ohms range, you'll be able to find the ground pin.

    if the set has an amplifier mode select that turn it on and probe
    the remaining pins on the ohms range, you'll hear when you get it right.
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