GDR-XXXX NAV/COM INSTALLATION MANUAL
CHAPTER 1 – INTRODUCTION
64-000109
Page 11 of 62
F.
COM TX Power:
The transmitter is configured for either 16 Watts or 25 Watts as
determined by the part number. This is identified by the number “16” or “25”
respectively as the first two digits in the model number.
G.
VHF frequency range:
Depending on the model number, the VHF receiver
operates in the 118 MHz to 136.991 MHz, or the extended 118 MHz to 155.975
MHz range with either 8.33 KHz or 25 KHz spacing. This is identified with the
number “36” or “56” respectively as the third and fourth digits in the model number.
The 8.33 kHz spacing is used in the ICAO EUR region states.
H.
UHF frequency range:
Units with UHF transceivers operate from 225 MHz to
399.975 MHz with either 12.5 KHz or 25 KHz spacing. The letter “U” at the end of
the model number designates that the UHF option has been enabled. The UHF
transceiver can operate in simplex or semi-duplex mode.
I.
COM guard receivers:
Guard receivers are factory configured with the standard
emergency frequencies of the 121.5 MHz and/or 243 MHz. The receivers may be
disabled or configured for other channels as desired.
J.
TX interlock:
A TX interlock input is available when needed for multiple transmitter
installations.
K.
NAV ILS/VOR receiver:
The GDR has a combined VHF Omnidirectional Radio
(VOR) and Localizer (LOC) receiver. The VOR covers 160 channels and the LOC
covers 40 channels in the 108.00 to 117.95 MHz range.
L.
NAV audio:
The GDR provides a separate audio outputs for the VOR/LOC. Audio
volume control is available in the radio for single pilot operation when an audio
panel is not available.
M.
Glideslope receiver:
The GS channels are automatically paired by the radio to
provide Instrument Landing System (ILS) guidance on Localizer channels. The
GS covers 40 channels in the 330.95 MHz to 334.70 MHz range.
N.
NAV antenna:
The Glideslope and NAV receivers share a common antenna input
through an internal RF diplexer. The GDR is intended to be connected to a
combined VOR/LOC/GS antenna to be supplied by the installer. If two GDRs are
installed, an external NAV/GS splitter, similar to a Sensor Systems Model SSPD-
113-10 or equivalent, may be installed to route the VOR/LOC/GS signal to both
GDR receivers. This splitter is to be supplied by the installer. Alternately two NAV
antennas may be installed for redundancy. The GDR can tune an external
Distance Measuring Equipment (DME) transceiver using the ARINC 429
communications bus.
O.
Marker beacon receiver:
The GDR has a MB receiver, which uses a separate
BNC connector mounted on the front of the chassis. If two GDRs are installed, an
external MB splitter, supplied by the installer, may be used to route the MB signal
to both GDR receivers. A Cobham (Comant) Model CI 509 or equivalent splitter is
Summary of Contents for GDR- COM Series
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