microHAM micro KEYER 2R Manual page 47

PTT OUTPUTS
MK2R has four (4) PTT outputs for each radio: PTT1, PTT2,
PAPTT and LNA PTT. PTT1 and PTT2 are brought out to the
DB37 Radio connector. PAPTT and LNA PTT are RCA jacks for
connecting to external devices.
PTT1 is wired to the radio microphone jack and is used to
switch the radio into transmit in VOICE and CW mode.
PTT2 is wired to the radio Accessory jack and is used to switch
the radio into transmit in DIGITAL and FSK modes.
PTT2 or "rear panel" PTT is used by some radios to
automatically mute the microphone and disable
microphone processing circuits (audio equalizers,
transmit DSP, compression, clipping, etc.) that can distort
digital modulation.
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