![]() ![]() To prevent burning anything out, I recommend that you use a 100 ohm 1/4 watt resistor instead of plain wire for the jumper between the modular plug pin 8 and pin 6. This is because the MaraTrac has full battery voltage (13-14V) on that pin (they number it pin 1) at basically unlimited current (well, until something burns up) and the Hook input on the logic board has a 10V Zener diode protecting it, unlike the PTT input which has a 27V Zener diode protecting it. However, you WILL have a problem if you use this modified cable on a MaraTrac. ![]() Cautions With Other Radios: MaxTrac, Radius, GM300, DeskTrac, SM50, SM120, M1225, R1225, CDM, and GTX radios either don't use pins 7 and 8 (what some of them refer to as pins 1 and 2), or supply only 5-8V or have a 27V Zener diode on the Hook line, so the added jumper will have no effect. ![]()
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