SOURCE: very old astatic 525 mike wiring
Hello..maybe not a solution..but a hint..measure red-black for 0 ohms while pushing "ptt button" i think it's ptt...bare and transparent is mike...but you can look at original mike and make the same measurement for finding out what is ptt..the two others is mike ...good luck...Ron
SOURCE: Looking to install astatic echo board in uniden PC78XL
usally on most radios you will unplug the wire that comes from the number two mic plug. you will hook you sheid witch is the 2 little black wires from the echo board to number one mic plug. then the two wires will go to wire you unplug and the other one will go to number 2 mic plug.
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