CESSNA AIRCRAFT COMPANY FOR TRAINING USE ONLY
MODEL 152 9-25
SUPPLEMENT
CESSNA 300 ADF (Type R-546E)
SECTION 1 – GENERAL
The Cessna 300 ADF is a panel-mounted, digitally tuned automatic direction finder. It is designed to
provide continuous 1 kHz digital tuning in the frequency range of 200 kHz to 1,699 kHz and eliminates
the need for mechanical band switching. The system is comprised of a receiver, loop antenna, bearing
indicator and a sense antenna. In addition, when two or more radios are installed, speaker-phone
selector switches are provided. Each control function is described in Figure 1.
The Cessna 300 ADF can be used for position plotting and homing procedures, and for aural reception of
amplitude-modulated (AM) signals.
With the function selector knob at ADF, the Cessna 300 ADF provides a visual indication, on the bearing
indicator, of the bearing to the transmitting station relative to the nose of the airplane. This is done by
combining signals from the sense antenna with signals from the loop antenna.
With the function selector knob at REC, the Cessna 300 ADF uses only the sense antenna and operates
as a conventional low-frequency receiver.
The Cessna 300 ADF is designed to receive transmission from the following radio facilities: commercial
broadcast stations, low-frequency range stations, FAA radio beacons, and ILS compass locators.
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