COMMUNICATIONS, UHF COM
Operation
Aircraft Operations Manual
4/6.2
O
PAGE
1
Apr 01/15
1.
LIMITATIONS
Not applicable.
2.
NORMAL OPERATION
CONDITIONS
NORMAL PROCEDURES
2.1
POWER UP
1.
R AVION switches
ON
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−
Power is supplied to the UHF by setting R AVION switch ON.
2.
UHF volume lever (COM 3 on ACP)
SET
. . . . . . . . . . . . . . .
−
Set volume lever to approximately middle position.
3.
UHF volume knob (Control unit)
ROTATE
. . . . . . . . . . . . . . . . . .
−
Rotating the volume knob clockwise out of the OFF detent position applies
power to the UHF.
−
Received audio volume is controlled by rotating the
knob clockwise to increase the volume and
counter clockwise to decrease the volume.
2.2
UHF COM
SYSTEM TEST
1.
PUSH TONE button (COM control unit)
PRESS AND HOLD
. . . . . . . . . . . .
−
Pressing this button modulates the signal with a 1 KHz tone. This verifies
the operation of the transmitter and the audio system (this feature is dis-
abled in the BOTH mode).
2.
PUSH TONE button
RELEASE.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3
SQUELCH
TEST
1.
MODE button (COM control unit)
PRESS
. . . . . . . . . . . . . . . . .
−
Press and release the MODE button until the unit is in MAIN mode of opera-
tion (indicated by the MN annunciator being illuminated).
2.
Volume knob
PRESS.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−
Press and release the volume knob to remove automatic squelch. To place
the radio back in automatic squelch, momentarily press the volume knob.
2.4
MODE
SELECTION
1.
MODE button (COM control unit)
PRESS
. . . . . . . . . . . . . . . . .
−
Press and release the MODE button until the unit is in desired receiver
mode.
(Cont’d)