Cessna 152 - Page 229

PILOT'S
OPERATING
HANDBOOK
SUPPLEMENT
CESSNA 400 TRANSPONDER
AND
ENCODING
ALTIMETER
SUPPLEMENT
CESSNA
400
TRANSPONDER
(Type
RT-459A)
AND
OPTIONAL ENCODING
ALTIMETER
(Type
EA-401A)
SECTION
1
GENERAL
The
Cessna
400
Transponder
(Type 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
"seen
and
identify
the
aircraft,
while
in
flight,
on the
control
center's
radar
scope
more
readily.
The 400
Transponder
consists
of
a
panel-mounted
unit
and an
exter-
nally-mounted
antenna.
The
transponder
receives
interrogating
pulse
signals
on 1030
MHz
and
transmits
coded
p.ilse-train
reply
signals
on
1090 MHz.
It
is
capable
of
replying
to Mode A
(aircraft
identification)
and Mode C (altitude
reporting)
interrogations
on a
selective
reply
basis
on
any
of
4,096
information
code
selections.
When
an
optional
panel
mounted
EA-401A Encoding
Altimeter
(not
part
of 400
Transponder
System)
is
included
in
the
avionic
configuration,
the
transponder
can
provide
alti-
tude
reporting
in
100-foot
increments
between
-1000
and
+35, 000
feet.
All
Cessna
400
Transponder
operating
controls,
with
the
exception
of
the
optional
altitude
encoder's
altimeter
setting
knob,
are
located
on
the
front
panel
of
the
unit.
The
altimeter
setting
knob
is
located
on
the
en-
coding
altimeter.
Functions
of
the
operating
controls
are
described
in
Figure
1.
1
July
1978
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of
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