Cessna 152 - Page 191

PILOT'S
OPERATING
HANDBOOK
SUPPLEMENT
3.
FUNCTION
SWITCH:
CESSNA
300
ADF
(TYPE
R-546E)
BFO:
Selects
operation
as
communication
receiver
using
only
sense
antenna
and
activates
1000-Hz
tone
beat
frequency
oscillator
to
permit
coded
identifier
of
stations
transmitting
keyed
CW
signals
(Morse
Code)
to
be
heard.
REC:
Selects
operation
as
standard
communication
receiver
using
only
sense
a.i;ltenna.
ADF:
Set
operates
as
automatic
direction
finder
using
loop
and
sense
anten-
nas.
TEST:
Momentary-on
position
used
during
ADF
operation
to
test bearing
reliability.
When
held
in
TES~
position,
slews
indicator
pointer
clockwise;
when
released,
if
bearing
is
reliable,
pointer
returns
to
original
bearing
position.
4.
INDEX
(ROTATABLE
CARD)
-
Indicates
relative,
magnetic,
or
true
heading
of
aircraft,
as
selected
by
HDG
control.
5.
POINTER
-
Indicates
station
bearing
in
degrees
of
azimuth,
relative
to
the
nose
of
the
aircraft.
When
heading
control
is
adjusted,
indicates
relative,
magnetic,
or
true
bearing
of
radio
signal.
6.
HEADING
CONTROL (HDG) -
Rotates
card
to
set
in
relative,
magnetic,
or
true
bearing
information.
1
July
1978
3