Site Schematics for Rattlesnake and Joe Butte
As related to BFT

EFJ 7187 Audio-Logic Board connections for MDC Pigtail:

YELLOW--PIN 12 U301 TX AUDIO (MDC MODEM VOLUME @47)
BROWN--PIN 4 OF BELT, PTT
GRAY---- PIN13 OF BELT, DETECTOR AUDIO
BLACK---GROUND
ORANGE--PIN 1 U-303       COS >7 VDC W/SIGNAL, <.5 VDC NO SIGNAL

MCC Pigtail - molex                EFJ Third Party Interface
                                              Viking 2004 VX Universal Station

YELLOW - PIN 4                    "TXAUD"    Transmit Audio - J2 PIN 5
BROWN - PIN 2                      "PTT"      Transmitter Key - J2 PIN 7
BLACK - PIN 9                       "GND"      Logic Ground (chassis) - J2 PIN 21
ORANGE - PIN 3                    "LOGSQ"    Carrier Activated Switch - J2 PIN 4
GREY PIN 5                           "WBDIS"    Receiver Detector Output - J2 PIN 2