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17
PILOT'S OPERATING
HANDBOOK
CESSNA
3OO
TRANSPONDER
SUPPLEMENT
AND ALTITUDE ENCODER (BLIND)
SUPPLEMENT
CESSNA
3OO
TRANSPONDER
(Type RT-359A)
AND
oPTToNAL
ALTTTUDE
ENCODER
(BLTND)
SECTION
1
GENERAL
The Cessna
300
Transponder
(Type RT-359A), shown in
Figure
f
.
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
300
Transponder
system consists of
a
panel-mounted
unit
and an
externally mounted
antenna. The
transponder
receives
interroga-
tion
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
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
300
Transponder system) required for
Mode C
(altitude
reporting)
operati.on 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
300
Transponder system, altitude reporting
capabilities
are
available in
100-foot
increments
between
-
1000
and
+20,000
feet.
A]l
Cessna
300
'Iransponder operating controls
are
located
on
the
front
panel of the unit. Functions of the operating controls are described in
Figure
1.
1
July
1979
tof6
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