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MX170C Interconnect 
 
 

The following table lists the pin description for the MX170C external interconnect: 

      Pin# Description    Pin# Description 

      1 Nav A+    22 DME M0

      2 GS +     23 DME M1

      3 VOR/LOC Signal   24 DME M2

      4 ILS ENABLE    25 DME M3

      5 50 KHz GS    26 NAV A + Switched

      6 0.1 MHz GS    27 DME K0

      7 0.3 MHz GS    28 DME K1

      8 0.5 MHz GS    29 DME K2

      9 0.7 MHz GS    30 DME K3

      10 0.9 MHz GS    31 DME 50 KHz

      11 108 MHz GS    32 DME Common

      12 109 MHz GS    33 VOR Test

      13 110 MHz GS    34 Phones, Comm

      14 111 MHz GS    35 Nav Audio

      15 Aux Audio -3    36 Aux Audio – 1

      16 Aux Audio -4    37 ICS

      17 A / C Power Switched  38 Not Used

      18 13.5 vdc Input   39 Mic Audio

      19 Ground    40 Mic Key

      20 A / C Power    41 Speaker

      21 Power / Speaker Ground  42 Comm Flip Flop* 
 

* Requires addition of internal resistor R53 on computer board.






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