Question about Astatic 636L Noise Canceling Microphone Microphone

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The mic doesnt work ...it use to but all the sudden it quit doesnt even key up so i can hear it my talk back

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First, try another mic on the radio to be sure it's the mic and not the radio causing the problem. If it's the mic, check the wiring circuits for a bad switch or broken wire. Simply...the TX circuit is closed and the RX is open when the key is squeezed. The RX circuit is closed and the TX circuit is open when the key is released. Use a simple ohm meter to check for resistance between the pins on the mic (after removal from the radio of course). Open circuit will read 1, closed circuit should be very close to zero. You'll probably find the TX circuit never closes when the key is squeezed. Could be a broken wire or faulty switch in the handset.
Also check...If the mic "keys up"...you see the meter move normally, but no voice...it's either a faulty mic element (the little round thing you talk into) or the audio circuit of the radio has a defective component which a good CB shop can replace.

Posted on Sep 04, 2009

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Posted on Jan 02, 2017

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The mic switch is responsible for putting the radio into receive mode when you release the key. If the RX wire is broken, the radio will not go into receive.

Normally when this happens you have no receive at all no matter what, but you will have very low sound if you have talk back installed in the radio.

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My Cobra 29 LTD sometimes does not work even though the lights remain on. In other words I can't talk on it or hear anyone even though it appears to be operational


Your mic or mic jack is faulty. Try a different mic. In cobra 29's and some other variants, when you disconnect the mic, the audio is disabled. It will still receive, and transmit(possibly) but you will hear nothing from the radio.

It could be,
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1 Answer

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