Here is a close up of an Astatic #40007-0000 push to talk (PTT) momentary switch. Wire color code as follows: white-audio, shield-ground, black-receive (RX), red-transmit (TX), yellow-power, thin red wire-mic element, thin white wire-mic element (not hooked up to the PTT). This style of momentary switch is used in several brand microphones like Astatic 636L, Turner Road King 56 and Skythumper ST-65DX. Wiring codes may vary in other brands, Bulldog.
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