Cessna TR182 1979 Pilot Operating Handbook page 253

PILOT'S OPERATING HANDBOOK
SUPPLEMENT
CESSNA 300 ADF
(TYPE R-546E)
3. FUNCTION SWITCH:
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
antenna.
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 TEST position, slews indicator potnter
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 October 1978 3