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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.
Offhand, the 4 pin mic connector and corresponding pin # would depend on the communications equipment the Astatic was initially wired for. However, the color coding of the wires in an Astatic would be:
white - mic audio;
shield/blue - gnd;
black - NC or speaker;
red - NO or PTT;
yellow - not normally used.
Good luck and Thank you for using FixYa. Happy Holidays.
According to the astatic wiring hand book it is not used. I would leave it terminated but long enough that if you find your having noise when you receive you could still ground it. I'm pretty sure you don't need it.
if your talking about the Sears Roadtalker 40 am only model I got ya covered...its the same pinout as the radio shack 5 pin dins...here is the order
Pin 1 = GND
Pin 2 = Not Connected
Pin 3 = transmit
Pin 4 = Audio
Pin 5 = Recieve
Hope this helps you..