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1 GENERAL DESCRIPTION
1.1 Introduction
This manual presents mechanical and electrical installation requirements for installing the GDR 66 as part
of a Garmin Integrated Flight Deck. The GDR 66 can be integrated into a variety of airframes under an
appropriate TC or STC. Each airframe installation may vary. Use only approved (type or supplemental
type) data for specific installation instructions in a particular aircraft.
1.2
Equipment Description
The GDR 66 is a remote mounted digital communications transceiver. The GDR 66 operates in the
following modes in the 118.000 to 137.000 MHz VHF aviation communications band:
• Analog Voice Mode (ARINC 716 Voice): Voice communications using DSB-AM modulation with
8.33 and 25 kHz channel spacing.
• VDL Mode 0/A (ARINC 716 Data): ACARS using DSB-AM modulation with a 2.4 kbps data rate
and 25 kHz channel spacing.
• VDL Mode 2 (ARINC 750 Data): Data link using D8PSK modulation with a 31.5 kbps data rate
and 25 kHz channel spacing.
1.3
Interface Summary
The GDR 66 provides the following interfaces:
• 2 RS-422 inputs
• 2 RS-422 outputs
• 1 RS-232 input
• 1 RS-232 output
• 5 configurable ARINC 429 inputs
• 2 configurable ARINC 429 outputs
• 8 configurable active low discrete inputs
• 5 active low discrete inputs: COM MIC KEY*, COM REMOTE TRANSFER*, GDR SYSTEM ID
PROGRAM* 1, GDR SYSTEM ID PROGRAM* 2, GDR SYSTEM ID PROGRAM* 3
• 1 active high discrete input: COM REMOTE POWER OFF
• 1 active low discrete outputs: KEY EVENT OUT*
• 1 analog microphone audio input
• 1 analog audio output
• 1 SELCAL audio/ACARS analog data output
• 2 aircraft power bus inputs
GDR 66 Installation Manual
190-00303-24
Page 1-1
Revision A
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