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motorola_interface_GM350

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GM-350/950 INTERFACING PIN n° Function Comments Status Color @ ON7EQ 2 Mic input nominal input level is 80mV for 60% deviation. The impedance is about 1k Do not use 3 Ext PTT GP1 set to PTT by codeplug. 4.7 kohm Internal Pull Up Resistor to +5 V. GND to TX Pin 13 Arduino Yellow 4 Carr detect GP2 set to Carrier detect by codeplug / Level 0 - 11v about !!!! Pin A0 Arduino Blue 5 Flat TX audio in nominal input level is 150 mVRMS for 60% deviation. The impedance > 25k Audio ISD + CW Red - Shielded 7 Ground Ground for audio , signals I/O Black 8 CTCSS detect GP3 set to PL/CTCSS detect by codeplug, level 0 - 5v about Pin A1 Arduino White 10 Ignition Sense Connect to +12v by 1k2 ... 4k7 resistor. Required for auto startup when DC applied. Red 11 RX audio out continuous discriminator audio, level 330 mVRMS @ 60% deviation, impedance 600 ohms. Audio in ISD White - screened 15 RSSI Received Signal Strength Indication, buffered analog voltage (2.00- 4.50v about) Pin A6 Arduino Brown Pins 17 to 20 not present on GM-350 !

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