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GDR-XXXX NAV/COM INSTALLATION MANUAL
CHAPTER 1 – INTRODUCTION
64-000109
Page 12 of 62
acceptable. The lamp indicators of the MB receiver are contained in the
transmitted ARINC 429 Label 222 (VOR) and the RS-232 message ID V33. No
discrete lamp drivers are provided.
P.
Marker audio:
The GDR has a separate MB audio output for connection to the
aircraft’s audio system. Audio volume control is available in the radio for single
pilot operation when an audio panel is not available.
Q.
Marker thresholds:
The MB receiver has a HI and LO threshold factory set for -67
dBm and -53 dBm respectively. When am external splitter is installed, the installer
may wish to compensate the MB thresholds for the loss. On installation, the
threshold may be adjusted using the RS-232 ID V52, which is stored in non-volatile
memory.
R.
Control buses:
The GDR radio has four (4) tuning buses, two RS-232, two RX
ARINC 429 and one TX ARINC 429. The last bus tuned controls the radio, which
is compatible with burst mode tuning.
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