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Can't find a schematic or the mic wiring for the 23 channel AM mode only Regency CR-230


But I'll guess that it would work with a Cobra mic something like this. 

Could be wrong, so maybe someone else can chime in and correct this if it is wrong:


WHITE - pin 1 (mic audio)

SHIELD & BLACK - pin 2 (ground)

No Connection - pin 3

RED - pin 4 (push-to-talk)