Question about Superstar SS-121 120-Channels Base CB Radio

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Mic hum Hello, I recently obtained a Superstar 140 radio without a mic. I connected a mic from a uniden pc76xl and every time I key up there is a loud humming noise coming from the mic. It does not come from the radios speaker but through the mic itself. Would it be that the wirin gis different on these radios. If so where can I get the diagram for the wiring. The mic is a from a Galaxy radio. Any help would be appreciated. Thank You. Nef...

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Yes, the wiring is different. Reverse the wires on pins 1 & 2, then reverse the wires on pins 3 & 4.

The wiring for you radio's mike is:

1- Audio
2-Ground (Shield)
3-Receive
4-Transmit

Depending on the vintage of your mike, the colors Uniden uses for these functions are white or yellow for audio, red is transmit & black is receive.

Posted on Sep 26, 2008

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