NGT—Checks and adjustments
NGT Transceiver System Technical Service Manual 175
Adjusting mute
The mute control should be adjusted so that it is sensitive enough to operate on the
weakest signal possible without false triggering on noise pulses.
To adjust the mute:
1 Connect the transceiver to an antenna (a short length of wire will do).
1 Select an unoccupied channel.
1 Press MUTE and V/S until a highlighted V is displayed on the handset screen.
Voice mute is enabled.
1 Turn the preset potentiometer MUTE ADJ (R85) on the Audio Interface PCB
(2010)/Audio & Interconnect PCB (2011)/Audio Interconnect & Data I/O PCB
(2012) in the RF unit fully clockwise.
1 Slowly turn the potentiometer counterclockwise until you hear receiver noise in the
loudspeaker (this is the mute threshold).
1 Turn the potentiometer back in a clockwise direction a quarter turn.
The sensitivity may be varied from this setting to suit individual requirements. Turning
the potentiometer counterclockwise increases sensitivity.
ALTERNATIVE TEXT
2010: Drawing 08-05266
2011: Drawing 08-05988 (sheet 1)
2012: Drawing 08-06261 (sheet 1)
NOTE
The transceiver does not have to be in Service mode to make this
adjustment.
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