CESSNA AIRCRAFT COMPANY FOR TRAINING USE ONLY
MODEL 152 9-41
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 and an externally-mounted
antenna. 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
4,096 information 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 are located on the front panel of the unit. Functions of
the operating controls are described in Figure 1.
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