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CESSNA 300 ADF
PILOT'S OPERATING HANDBOOK
(TYPE R-546E)
SUPPLEMENT
1. OFF/VOL CONTROL - Controls primary power and audio output level. Clock-
wise rotation from OFF position applies primary power to receiver; further
clockwise rotation increases audio level.
2. FREQUENCY SELECTORS - Knob (A) selects 100-kHz increments of receiver
frequency, knob (B) selects 10-kHz increments, and knob (C) selects 1 kHz
increments.
Figure 1. Cessna 300 ADF Operating Controls and Indicators (Sheet 1 of 2)
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1 July 1979
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PILOT'S OPERATING HANDBOOK
CESSNA 300 ADF
SUPPLEMENT
(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 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 CARD CONTROL (HDG) - Rotates card to set in relative, magnetic, or
true bearing information.
1 July 1979
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