Cessna 1980 182Q Pilot's Operating Handbook And Flight Manual page 326

27
CESSNA 400 NAV/COM
(TYPE RT-485A)
PILOT'S OPERATING HANDBOOK
SUPPLEMENT
Both the 300 and 400 Series course deviation indicators include either a
single-pointer and related NAV flag for VOR/LOC indication only, or dual
pointers and related NA V and GS flags for both VOR/LOC and glide slope
indications. Both types of indicators incorporate a back-course lamp (BC)
which lights when back course (reversed sense) operation is selected.
Indicators with Automatic Radial Centeringwill, when selected, automati-
cally indicate the bearing TO or FROM the VOR station.
The Cessna 400 N av / Com incorporates a variable threshold automatic
squelch. With this squelch system, you set the threshold level for auto-
matic operation - the further clockwise the lower the threshold - or the
more sensitive the set. When the signal is above this level, it is heard even
if the noise is very close to the signal. Below this level, the squelch is fully
automatic so when the background noise is very low, very weak signals
(that are above the noise) are let through. For normal operation of the
squelch circuit, just turn the squelch clockwise until noise is heard - then
back off slightly until it is quiet, and you will have automatic squelch with
the lowest practical threshold. This adjustment should be rechecked
periodically during each flight to assure optimum reception.
All controls for the Nav/ Com, except the omni bearing selector (OBS)
knob or automatic radial centering (ARC) knob, which is located on the
course deviation indicator. are mounted on the front panel of the receiver-
transmitter. The audio control panels used in conjunction with this radio
are shown and described in Section 7 of this handbook.
SECTION 2
LIMITATIONS
There
IS
no change to the airplane limitations when this avionic
equipment is installed.
2
1 October 1979