Cessna 172P - Page 311

PII,OT'S
OPER,ATING
HANDBOOK
SUPPLEMENT
16
cEssNA
300
NAV/COM
(TYPE
RT-38õA)
3. NAVIGATION
OPERATING
FREQUENCY READOUT
4, ID-VOX-T SMTCH
-
\[/ith
VOR or LOC sta,tion soleoted, in
ID
poêition,
sta,tion
identifier
sig[a,l
is
audible;
in
VOX
(Voice)
position,
ldentifier
signa,I
is sup.
prossed;
in T
(Momentary
On)
position,
the VOR navlgational self-test
function
is
select€d.
5.
NAVIGATIONR,ECEIVERFR,ACTIONALMEGAHERTZSELECTOR
-
SEIøCtS
Nav frequenoy in .05-MHz
stepe between .00 and,9õ MHz; simultaneously
solocts
paired glide
slope
frequenoy a,nd
DME ohennol.
6. NAV
VOL CONTFOL
-
Adjusts
volume of navigetion receiver
audio.
?.
NAVIGATION
RECEIVER
MEGAIIERTZ SELECTOR
-
Selects
NAV
frequency
in
l-MHz steps
betwe€n
108 and 117
MHz;
simultaneously
selects
paired
glide
slope frequency and
DME channel.
8.
COMMUNICAÎION
R,ECEIVER,.TRANSMITTEF,
FRACTIONAL
MEGAHERTZ
SELECTOR,
- Depending on
position
of õ-0 switoh, s€lects COM
frequency
in .05-
MHz steps between .000
and .975 M.Ilz.
Th€ 5-0 switch identifies
tho last digit as
either 5 or 0.
L SQUELCH
CONTROL
-
Used
to adjust
signal threshold necessery
to activate
COM
receiver
audio, Clockwise
rotation
increasos background noise
(decreases
squolch action);
oountorclockwise rotatiorl
docroasos background noise.
10. COMMUNICATION IIECEIVER,-TN,ANSMITTER,
MEGAHERTZ
SELECTOR,
-
Solects COM
frequency in l-MHz steps
between 118 and 135
MHz.
11.
COM OFF-VOL CONTROL
-
Combination
on/off swltch and volume control;
turns
on
NAV/
COM
set end
controls volume of communications receiver
audio.
I2. BC LAMP
- Amber light illuminates
when
a,n
a,utopilot's back-course
(reverse
sonse)
function is
engaged; indicates course
deviation
pointer
is
reversed on
selected
receiver
when tuned to a
localizer frequency. Light dimming ís
only
avaitable
when
installod with an
audio control
panel
incorporating the annuncia-
tor lights
DAY/NITE
selector switoh.
13.
COURSE INDEX
-
Indicates
selected VOfù
course.
14.
COURSE DEVIATION
POINTER
-
Indicates
course
devia,tÍon from
setocted
omni
course
or
localizer
centerline,
15,
CLIDE
SLOPE isible,
red
GS flag
indicates
unreliabto
glide
slope
sign&l
or
€quipment.
Flag
disappears
when a relis,ble
glide
slope
sig
16.
GLIDE
sLoPE DEVIATION
POINTER
-
Indicates
deviation from ILS
glide
slope.
Figure 1. Cossna 300
Nav/Com
(Type
RT-385A),
Operating
Controls
and Indicators (Shoet
2
of B)
I
80 May 1980