Cessna TURBO CENTURION T210M 1978 Pilot Operating Handbook page 243

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 a s standard communication r e-
ceiver using only sense antenna.
ADF: Set operates as automatic direction finder using loop
and sense antennas.
TEST: Momentary-on position used during ADF operation
to test bearing reliability. When held in TEST
position, slews indicator pointer clockwise; when
released,
if
bearing is r eliable, 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
oI
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.
Figure 1. Cessna 300 ADF Operating Controls and Indicators (Sheet 2 of 2)
3