Specifications

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.