CESSNA AIRCRAFT COMPANY FOR TRAINING USE ONLY
MODEL 152 9-19
SUPPLEMENT
CESSNA 300 NAV/COM (720-Channel – Type RT-385A)
SECTION 1 – GENERAL
The Cessna 300 Nav/Com (Type RT-385A), shown in figure 1, consists of a panel-mounted receiver-
transmitter and a single or dual-pointer remote course deviation indicator.
The set includes a 720-channel VHF communications receiver-transmitter and a 200-channel VHF
navigation receiver, both of which may be operated simultaneously. The communications receiver-
transmitter receives and transmits signals between 118.000 and 135.975 MHz in 25-kHz steps. The
navigation receiver receives omni and localizer signals between 108.00 and 117.95 MHz in 50 kHz steps.
The circuits required to interpret the omni and localizer signals are located in the course deviation
indicator. Both the communications and navigation operating frequencies are digitally displayed by
incandescent readouts on the front panel of the Nav/Com.
A DME receiver-transmitter or a glide slope receiver, or both, may be interconnected with the Nav/Com
set for automatic selection of the associated DME or glide slope frequency. When a VOR frequency is
selected on the Nav/Com, the associated VORTAC or VOR-DME station frequency will also be selected
automatically; likewise, if a localizer frequency is selected, the associated glide slope frequency will be
selected automatically.
The course deviation indicator includes either a single-pointer and related NAV flag for VOR/LOC
indication only, or dual pointers and related NAV and GS flags for both VOR/LOC and glide slope
indications. Both types of course deviation indicators incorporate a back-course lamp (BC) which lights
when optional back course (reversed sense) operation is selected. Both types may be provided with
Automatic Radial Centering which, depending on how it is selected, will automatically indicate the
bearing TO or FROM the VOR station.
All controls for the Nav/Com, except the standard omni bearing selector (OBS) knob or the optional
automatic radial centering (ARC) knob located on the course deviation indicator, are mounted on the
front panel of the receiver-transmitter. In addition, when two or more radios are installed, aircraft
mounted transmitter selector and speaker/phone switches are provided.
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