Cessna T182 1982 Pilot Operating Handbook page 231

29
PILOT'S OPERATING HANDBOOK CESSNA 400 TRANSPONDER
SUPPLEMENT AND ALTITUDE ENCODER (BLIND)
SUPPLEMENT
CESSNA 400 TRANSPONDER
(Type RT-459A)
AND
OPTIONAL ALTITUDE ENCODER
(BLIND)
SECTION 1
GENERAL
The Cessna 400 Transponder (Type RT-459A), shown in Figure 1, is the
airborne component of an Air Traffic Control Radar Beacon System
(ATCRBS). The transponder enables the ATC ground controller to "see"
and identify the aircraft, while in flight, on the control center's radarscope
more readily.
The Cessna 400 Transponder system consists of a panel-mounted unit,
an externally-mounted antenna and an optional control wheel-mounted
XPDR IDENT switch. The transponder receives interrogating pulse
signals on 1030 MHz and transmits pulse-train reply signals on 1090 MHz.
The transponder is capable of replying to Mode A (aircraft identification)
and also to Mode C (altitude reporting) when coupled to an optional
altitude encoder system. The transponder is capable of replying on both
modes of interrogation on a selective reply basis on any of 4096 informa­
tion code selections. The optional altitude encoder system (not part of a
standard 400 Transponder system) required for Mode C (altitude reporting)
operation consists of a completely independent remote-mounted digitizer
that is connected to the static system and supplies encoded altitude
information to the transponder. When the altitude encoder system is
coupled to the 400 Transponder system, altitude reporting capabilities are
available in 100-foot increments between -1000 feet and the airplane's
maximum service ceiling.
All Cessna 400 Transponder operating controls, with the exception of
the optional XPDR IDENT switch, are located on the front panel of the unit.
The remote XPDR IDENT switch is located on the right hand grip of the
pilot's control wheel. Functions of the operating controls are shown and
described in Figure
1.
21 August 1981
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