GDR-XXXX NAV/COM INSTALLATION MANUAL
CHAPTER 1 – INTRODUCTION
64-000109
Page 10 of 62
7. FUNCTIONAL DESCRIPTION
A.
The GDR is a remotely mounted Very High Frequency (VHF) Navigation (NAV)
receiver, a VHF Communications (COM) receiver, an Ultra High Frequency (UHF)
Communications receiver and Marker receiver contained in a single rack-mounted
enclosure. A single transmitter is shared between the VHF and UHF COM radios.
The features included in the GDR are configured during manufacturing as defined
by the part number. The GDR is intended for air traffic control (ATC)
communications and VOR/ILS navigation.
Figure 1: GDR-XXXX
B.
COM RX:
Four (4) communications receivers are included in the GDR unit; two (2)
for VHF (Main and Guard) and two (2) for UHF (Main and Guard). Each band has
a separate audio output for audio panel interfacing. Guard and Main audio are
combined on the same output for each band. Audio volume control is available in
the radio for single pilot operation when an audio panel is not available.
C.
COM TX:
The GDR shares a single transmitter for VHF and UHF frequencies.
The VHF and UHF receivers have a separate microphone (MIC) inputs, Push-To-
Talk (PTT), and audio output for interface with the aircraft’s audio system. The
transmit frequency is determined by the PTT selected and the Main receiver
channel. Simultaneous VHF and UHF transmission is not allowed.
D.
COM Classes:
TX class, 3 and 5. RX class, C, D, and E.
E.
Sidetone:
A separate Sidetone audio output is available. Sidetone can be
configured to be on the receiver’ audio output or obtained from the independent
Sidetone audio output. When Sidetone is combined with the audio, only the
transmit band’s audio will have Sidetone present.
Summary of Contents for GDR- COM Series
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