Cessna TURBO CENTURION T210M 1978 Pilot Operating Handbook page 245

PILOT'S OPERATING HANDBOOK
SUPPLEMENT
CESSNA 300 ADF
(TYPE R-546E)
TO OPERA TE BFO:
(1) OFF/VOL Control -- ON.
(2) Function Selector Knob -- BFO.
(3) Frequency Selector Knobs -- SELECT operating frequency.
(4) ADF SPEAKER/PHONE Switch -- SELECT speaker or phone
position.
(5) VOL Control -- ADJUST to desired listening level.
NOTE
A 1000-Hz tone is heard in the audio output when a CW
signal (Morse Code) is tuned in properly.
SECTION 5
PERFORMANCE
There is no change to the airplane performance when this avionic
equipment is installed, However, the installation of an externally mount-
ed antenna or several related external antennas, will result in a minor
reduction in cruise performance.
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