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Back to Home 		  Connecting the KPC3 to the
Maxtrac and GM300 Series Radios
by Earl Garber, N3EG 		  Print this Page


8 pin front panel connection: (no power available)
CONNECTION    KPC3    MAXTRAC/RADIUS and all Motorola mobiles with the 8 pin RJ-45 front panel mic jack:   NOTE: Pin 1 on your microphone plug is closest to the volume control.
TX audio                  1                 5
RX audio                  5                 8
PTT                          3                 6
Ground                     6                 4


Alternate connections for inside the radio on J8 (logic board connector):
CONNECTION    KPC3    MAXTRAC/RADIUS
TX audio                  1                 12
RX audio                  5                 1
PTT                          3                 11
Ground                     6                 10
+ 12 vdc                   7                 5

NOTE:  J8 is the plug on the right with the front panel connections facing you.
Pin 1 is on the right, and pin 3 is a keyway (no connection)


Connections for all radios with 16 pin accessory connector on rear of the radio:
CONNECTION    KPC3    MAXTRAC/RADIUS  (GM300, M10, M20, M120, M100, M206, M208, M216, SM50, SM120, M1225, etc.)
TX audio                  1                 2
RX audio                  5                 11
PTT                          3                 3
Ground                     6                 7
+ 12 vdc                   7                 13

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This information was originally posted to http://home.teleport.com/~n3eg/maxtrac.htm sometime about June 2002.
Teleport went away in late 2018 or early 2019. This page was recovered from web.archive.org in 2025 by WA6ILQ.

This web page created by Mike Morris WA6ILQ on 31-Dec-2025