I need a pinout for the microphone connector on my KDK FM-2033.
There is always a simple way to identify MIC connections, no-matter what rig
you have.
Power-OFF - use Ohm-meter to identify the Gnd terminal pin (chassis)
(now power on):
Touch 470-Ohm between each pin and Gnd - identify the PTT pin.
Ground PTT, touch other pins with finger, listen to mod to identify MIC
input pin.
RX, squelch open, touch high-impedance headphones (in series with 0.1uf cap)
between Gnd and other pins in turn. Identify if there is a RX out.
+12v via 47K to any remaining pins, one at a time - see what happens.
BR Harry
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