T-45C TS, ADV & IUT ENG-21
CNI System
f.
Squelch switch
(1) SQL: eliminates receiver background noise
when no signal is being received
(decreases reception sensitivity)
(2) OFF: disables main receiver automatic
squelch to increase reception range/
sensitivity
g.
Brightness (BRT) control knob: adjusts light
intensity of frequency/channel display
h.
Receiver volume (VOL) control knob: adjusts
level of UHF/VHF audio signals delivered to the
communications amplifier
NOTE: With exception of the marker signals
volume, volume of the COMM, VOR/ILS, and
TACAN are adjustable from each cockpit
through the individual system control unit.
3.
Throttle/stick
Sg 2, fr 6
Microphone Switch
a.
Microphone switch
(1) Location: above speed brake switch on
throttle handle in both cockpits
(2) Function: three-position slider-type switch,
spring loaded to center (off) position
(a) Up (XMIT-1): allows transmission on
frequency/channel selected on COMM
radio 1
(b) Down (XMIT-2): allows transmission
on frequency/channel selected on
COMM radio 2
(c) Depress (ICS): allows
intercommunication between cockpits
and/or between cockpits and ground
crew when MIC switch is in COLD
position
Page 21-17
(9-98) Original
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