Cessna 172R Pilot Operating Handbook page 249

o
COMM FREQUENCY TRANSFER BUTTON (
)
--
Interchanges the frequencies
in
the USE and STANDBY
displays. To tune the radio to the desired operating frequency,
the desired frequency must be entered into the standby
display and then the transfer button must be pushed. This will
trade the contents of the active and standby displays. The
operating frequency can also be entered by accessing
the
ACTIVE ENTRY (direct tune) mode which is done by pushing
the COMM TRANSFER button for 2 or more seconds. In the
direct tune mode, only the active part of the display is
visible.
The desired frequency can be directly entered into the display.
Push the COMM TRANSFER button again to return to the
active/standby display.
The transceiver is always tuned to the frequency appearing
in
the ACTIVE display.
It is,
therefore, possible to have two
different frequencies stored in the ACTIVE and
STANDBY
displays and to change back and forth between them at the
simple push of the transfer button.
COMM VOLUME CONTROL (OFF/PULL/TEST) -- Rotate the
VOL knob clockwise from the OFF position. Pull the VOL knob
out and adjust for desired listening level. Push the VOL
knob
back in to actuate the automatic squelch. The VOL knob
may
also be pulled out to hear particularly weak signals.
VOR/Localizer Needle or CDI needle.
Glideslope Flag
TO-FROM-NAV FLAG
Azimuth Card
OBS Knob
Glideslope Needle
Figure 1. Bendix/King KX 155A VHF NAV/COMM with KI 208 or KI
209A Indicator Head (Sheet 7 of 7)
o
Dec 2/96
51-11
CESSNA
SECTION 9 - SUPPLEMENTS
MODEL 172R
SUPPLEMENT 1 - FAA APPROVED
12.
--