Maas AHT-9-UV User Manual page 19

CALL
Activates T-CALL (1750Hz) for
repeater access and transmit
DTMF and 2/5 tone signaling.
PTT
Press it to transmit and release
it to receive after your
transmission is completed.
MONI
Long press this key disables
the noise squelching action,
allowing you to hear very weak
signals near the back-ground
noise level;
CALL
SP
PTT
MIC
MONI
MIC/SP
The jack provides connection
points for microphone audio,
earphone audio, speaker and
program cable.
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