190-00303-05
GIA 63 Installation Manual
Rev. Y
Page 4-25
4.6.2 Com/VOR/ILS/DIGITAL Audio Electrical Characteristics
4.6.2.1 Com Mic Key
INACTIVE: 10
≤
Vin
≤
33VDC or Rin
≥
100k
Ω
ACTIVE: Vin
≤
1.9VDC with
≥
75 uA sink current, or Rin
≤
375
Ω
Sink current is internally limited to 200 uA max for a grounded input
4.6.2.2 Com Mic Audio
COM MIC AUDIO has a 520 Ohm AC input impedance and supplies the microphone with a 9V bias
through 620 Ohms.
COM MIC AUDIO is set in the factory for 275 mV
RMS
to modulate the transmitter at 80% nominally. The
microphone gain adjustment is accessible through the GDU PFD/MFD.
4.6.2.3 Com/VOR/ILS Audio
COM UNSQUELCHED AUDIO OUT supplies at least 280 mVrms across a 500
load. This output is
referenced to ground.
500
Ω
COM AUDIO and 500
Ω
VOR/ILS AUDIO each supply 100 mW into a 500
Ω
load. 500
Ω
VOICE
ALERT AUDIO supplies 50 mW into a 500
Ω
load. These are balanced outputs and the LO output must be
connected.
500
Ω
COM AUDIO is the summation of the COM receiver audio and COM sidetone audio.
Table 4-17. Com Mic Key
Pin Name
Connector
Pin
I/O
COM MIC KEY*
P601
4
In
Table 4-18. Com Mic Audio
Pin Name
Connector
Pin
I/O
COM MIC AUDIO IN HI
P601
7
In
COM MIC AUDIO IN LO (GROUND)
P601
8
--
Table 4-19. Com/VOR/ILS Audio
Pin Name
Connector
Pin
I/O
COM UNSQUELCHED AUDIO OUT (011-01105-4X ONLY)
P601
1
Out
COM 500
Ω
AUDIO OUT HI
P601
9
Out
COM 500
Ω
AUDIO OUT LO
P601
10
Out
VOR/LOC 500
Ω
AUDIO OUT HI
P602
16
Out
VOR/LOC 500
Ω
AUDIO OUT LO
P602
17
Out
VOICE ALERT 500
Ω
AUDIO OUT HI
P604
2
Out
VOICE ALERT 500
Ω
AUDIO OUT LO
P604
3
Out
Summary of Contents for GIA 63
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