Garmin GNC 420AW Installation Manual - page 75
400W Series Installation Manual
Page 4-17
190-00356-02
Rev. F
4.7.2.3
240B
COM AUDIO, VOR/ILS AUDIO
Pin Name
Connector
Pin
I/O
500
Ω COM AUDIO HI
P4002 7
Out
500
Ω COM AUDIO LO
P4002 19
Out
500
Ω VOR/ILS AUDIO HI
P4006 16
Out
500
Ω VOR/ILS AUDIO LO
P4006 17
Out
500
Ω COM AUDIO and 500Ω VOR/ILS AUDIO each supply 100 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, COM sidetone audio, and
INTERCOM MIC audio.
4.7.2.4
241B
DISCRETE INPUTS
Pin Name
Connector
Pin
I/O
TRANSMIT INTERLOCK
P4002
14
In
COM REMOTE TRANSFER
P4002
15
In
VLOC REMOTE TRANSFER
P4006
28
In
These inputs are considered active if either the voltage to ground is < 1.9 V or the resistance to ground is
< 375
Ω. These inputs are considered inactive if the voltage to ground is 11-33 VDC.
COM REMOTE TRANSFER and VLOC REMOTE TRANSFER are momentary inputs.
4.7.3
136B
COM/VOR/ILS Audio Configuration
None.
4.7.4
137B
COM/VOR/ILS Audio Calibration and Checkout
Refer to Section
405H
5.3.12 for the COM calibration.
4.7.5
138B
COM/VOR/ILS Audio Interconnect
Refer to
406H
Figure H-19 for the audio panel interconnect.