190-01182-02
GTR 225/GNC 255 TSO Installation Manual
Rev. F
Page 5-14
5.2.10 DME Tuning
5.2.10.1 DME Tuning Function
The GTR/GNC can channel a DME based on the tuned VOR/LOC frequency. The GTR/GNC 2 of 5,
BCD, or Slip parallel DME and King Serial DME channeling format. When DME COMMON is held low,
the GTR/GNC actively tunes the DME.
5.2.10.2 DME Tuning Electrical Characteristics
5.2.10.2.1 Parallel DME Tuning
For each of the parallel DME tuning discrete outputs, the driver output voltage is not more than 1.0 V
while sinking 20 mA. The maximum off state leakage current with respect to ground is less than 10
A.
DME COMMON must be pulled low to indicate to the GTR/GNC that it is the device channeling the
DME.
DME COMMON is considered active if either the voltage to ground is less than 1.9 V or the resistance to
ground is less than 375
. These inputs are considered inactive if the voltage to ground is 11-33 VDC.
Pins 37, 40, 41, 42, 43, 45, 47, 33, 54, and 56 are configured for 2 of 5 parallel DME tuning.
Pin Name
Connector
Pin
I/O
PAR DME 100kHz-A/SERIAL DME ON
P2002
37
Out
PAR DME 100kHz-B
P2002
39
Out
PAR DME 100kHz-C
P2002
40
Out
PAR DME 100kHz-D
P2002
42
Out
PAR DME 100kHz-E
P2002
54
Out
PAR DME 50kHz
P2002
43
Out
PAR DME 1MHZ-A
P2002
45
Out
PAR DME 1MHZ-B
P2002
46
Out
PAR DME 1MHZ-C
P2002
47
Out
PAR DME 1MHZ-D/SERIAL DME ON
P2002
33
Out
PAR DME 1MHZ-E
P2002
56
Out
DME COMMON
P2002
41
In
