![]() This forum is for discussions regarding all aspects of Motorola radio programming, including hardware, computers, installation and use of RSS/CPS, firmware upgrades, and troubleshooting. There are subforums for discussions of codeplugs, and also for software/firmware release notes and issues. Features GM950E GM950i GM950 Plus Channels 4 64 128 LCD display – 3 digit 3 digit icons icons Numeric Channel Alias – Yes Yes. Program the TX power between 5 to 25 W per channel at the press of the button. Reducing radio interference to others especially in a congested radio environment. ![]() GM350, GM600, GM950, MCX600 Mobiles GM350/GM600/GM950/MCX600 Mobiles General Information These radios should all be similar to each other. If there are any significant differences, please. The MCX600 is the Asia version of the GM600 which is the MPT version of the GM350/950. The GM350 has its own RSS and are a PL/Singletone only version of the GM950. They come in two flavours, 4 channels without LCD and 128ch with LCD. Out of band is similar to the GP320/340 series. The GM950 also has its own RSS. They have similar features to GM350 but also have SELECT-5. It comes in 4 flavours, 4 channels w/o LCD, 128 ch with LCD, 128ch with handheld control mic (HHCM), and 128ch with full keypad (eg. 0-9 + * and #). Same Out of Band as for the GM350. If you are looking for the the pinout of the GTF377A 'Front to Back' cable, the pinout is: RJ45 8pin 16pin Accessory Function(Acc) 7 Orange 6 BUS+ 4 Green 7 Ground 1 Brown 13 SW B+ 3 Yellow 14 Hook The above cable lets you program from the accessory connector instead of the mic connector. It is an RJ45 female that is wired to a 16pin accessory connector using the above schematic. You plug this cable on the end of the standard programming cable (RJ45) and then into the accessory plug on the radio for rear programming (in the event you don't have a head on the radio to program through the mic jack). Accessory Connector Details The 16-pin accessory connector pin functions for the GM950 N3/N4 are as follows: Pin Name Type 1 SPKR- Analog O/P 2 Ext. Mic Audio Analog I/P 3 GP1 Digital I/P 4 GP2 Digital O/P 5 Flat TX Audio Analog I/P 6 BUS+ Digital I/O 7 GND Ground 8 GP3 Digital O/P 9 GP4 Digital I/P 10 Ignition Sense Digital I/P 11 RX Audio Analog O/P 12 GP5 Digital I/O 13* SW B+ Sense Analog O/P 14 Hook Digital I/P 15 RSSI Analog O/P 16 SPKR+ Analog O/P *Factory default SWB+ PIN 1 Speaker- Audio. Speaker- and Speaker+ (PIN 16) are used to connect an external speaker. The audio PA is a bridge amplifier with a minimum load resistance of 3.2 ohms. The internal speaker can be easily disabled by removing the control head. Disconnect the internal speaker and assemble the control head back to the radio. PIN 2 Microphone audio. This microphone signal input is common with the microphone singal input on the microphone connector and is connected to the microphone path input of the ASFIC. The nominal input level is 80mV for 60% deviation. The DC impedence is 1100 ohms and the AC impedence is 1000 ohms. Note: Only one microphone should be connected at any one time. PIN 3 General Purpose 1 (GP1). This is a digital input only and is also available on the internal option connector (J0102:7). The RSS details which functions may be assigned to this pin by the codeplug. The primary use for this pin will be external PTT.
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March 2019
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