Cessna 172P - Page 314

16
cEssNA
300NAV/COM
(TYPE
RT-38õA)
PILOT'S
OPERATING
HANDBOOK
ST'PPLEMENT
sEcTtoN 4
NORMAL
PROCEDURES
COMMUNICATION
RECEIVER,-TN,ANSMITTER
OPER,ATION:
1.
COM
OFF/VOL
Control
-- TURN
ON;
adjust to desired audio level.
2. XMTR
SEL
Switch
(on
audio control
panel)
--
SET
to desired
Nav/Com
Radio.
3.
SPEAKER/PHONE
Selector Switches
(on
audio control
panel)
--
SET to desired mode.
4.
5-0 Fractional
MHz Selector
Switsh
--
SELECT
desired operating
frequency
(does
not
affect navigation frequencies).
5.
COM Frequency
Eelector Switch
-- SELECT
desired operating
froquency.
6.
SQ Control
--
ROTATE oounterclockwise
to
just
eliminate
back-
ground
noise,
Adjustment
should be checked
periodically
to
a,asure
optimum reception.
7. Mike Button:
4,.
To Transmit
--
DEPRESS
and SPEAK into microphone.
NOTE
Sidetone may
be selected
by
placing
the
AUTO
selector
switch
(on
audio
control
panel)
in either the
SPEAKER
or
PHONE
position.
Sidetone
may be eliminated by
ptacing
the
AUTO
selector switch
in the OFF
position.
Adjustment
of sidetone
on audio
control
panels
supplied
with three
transmitters
cannot
be accomplished
externally.
How-
ever,
audio control
panels
supplied with two or
less
transmitters
ha,ve
sidetone adjustment
pots
that
are
eccessible through
the front ofthe
audio
control
panel
with
a sma,ll, screwdriver.
b.
To
F,eceive --
RELEASE mike
button.
NAVIGATION OPEA,ATION:
NOTE
The
pilot
should be aware that
on many Cessna airplanes
equipped
with the
windshield mounted
glide
slope
antenna,
pilots
should avoid use of 2700
+
100 RPM
on
airplanes equipped
with a two-bladed
propeller
or
1800
+
100 RPM
on airplanoe
equipped
with
a
three-bladed
pro-
peller
during ILS
approaches to avoid oscillations of the
glide
slope deviation
pointer
caused by
propeller
interfer-
ence.
6
80 May
1980