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PILOT'S OPERATING HANDBOOK
SUPPLEMENT
CESSNA 300 NAV/COM
(TYPE RT-385A)
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 in25-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 NA V 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
1 of 8
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