Textron 172R180HP, Pilot Operating Handbook

Page: 291 / 396

CESSNA
MODEL 172R
SECTION 9 - SUPPLEMENTS
SUPPLEMENT 2 - FAA APPROVED
SUPPLEMENT
BENDIX/KING KT 76C TRANPONDER
with BLIND ENCODER
SECTION 1
GENERAL
The Bendix/King Transponder (Type KT 76C), 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 more readily the aircraft on the
radarscope. The blind encoder (SSD120-20) (also shown in Figure
1) enables the transponder to automatically report aircraft altitude to
ATC.
The Bendix/King Transponder system consists of a panel­
mounted unit and an externally-mounted antenna. The transponder
receives interrogating pulse signals on 1030 MHz and transmits
coded pulse-train reply signals on 1090 MHz. It is capable of
replying to Mode A (aircraft identification) and also to Mode C
(altitude reporting) interrogations on a selective reply basis on any
of 4096 information code selections. When a panel-mounted
SSD120-20 Blind Encoder (not part of KT 76C Transponder
system) is included in the avionic configuration, the transponder can
provide altitude reporting in 100-foot increments between -1000 and
+ 20,000 feet.
The KT 76C features microprocessor and LSI (Large Scale
Integrated) control. Mode and code selection are performed using
the rotary knob and numeric buttons and all functions including the
flight level altitude are presented on a gas discharge display. All
display segments are automatically dimmed by a photocell type
sensor.
Dec 2/96
S2-3