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M120 Accessory connector pin configuration

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darrelhillman

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Hi friends, Got a Motorola Radius M120. I noticed that the radio does have a 16 pin accessory connector but there is no pin configuration choice when I go to the Radio Wide Configuration of the RSS. I am using GM300 Version R01.00.00 (Oct./94) and it also says Europe in the first screen. Will the problem be the software or the logic board??? Can be stll use as a repeater receiver? Please reply. Thank you. Darrel
 

mmckenna

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Batwing Laboratories is a great place for this info. All the connections you need are already there on the connector. If I remember correctly, you shouldn't need to change anything in programming, but it has been a while since I've programmed one of those.
 

darrelhillman

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Thank you mmckenna. I've read a lot at Batlabs, and for a novice is not that easy. They said to make shure the pins are configure correctly . Don't know if it's a program issue or the 2 radios that I have cannot configure those pins.

I did some tests with pin 8, it should have 5v when Mon key is pressed. I have 0 volts. I will do the wiring anyway and see what happens.

Thank you for the good advice. Darrel
 

cmdrwill

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I did some tests with pin 8, it should have 5v when Mon key is pressed. I have 0 volts. I will do the wiring anyway and see what happens.
Pressing the MON key will not activate the RUS output on pin 8.
Do you have an external 'pull up resistor'? The out put in the radio is a open collector transistor, so a resistor to 5 volts is needed, 4.7 to 10 k works well.

The output on pin 8 as it is normally high and goes low when the receiver un-squelches, RUS,
depending on how the radio receiver's PL/DPL is programmed
 
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