M130

[KB2ZTX]

I have a M130 radio Model Number - M43XQC20A2

This radio appears to be the same unit as an M120, however with a M120 on Pin 8, it will go low on COR. This unit will not. I tried a UHF version of the same with no luck either. In looking over the service manual it says that pin 8,12,14 are all programmable I/O pins, however there is no referance in the programming software for this. I am using GM300 version 5.0 to program this. Is there a different version specific to the M130. I also checked Pin 24 and 25 of U803, which is the gateway. Neither pin moves on COR.

Any thoughts on this. Everything I find out there says the radio is the same as the 120, but it doesn't appear to be....

Jeff

[stvnd53]

The M130 will not do that!Learned that the hard way

[KB2ZTX]

Thanks, Just was told that by Motorola. They said i have an older service manual....guess i goto ebay it...

Thanks

Jeff

[kcbooboo]

If all you want is a COR output, you can certainly add your own, if you have the proper schematic and board layout for that radio.

In the MaxTracs and Radiuses, there's an internal signal that comes out of the microprocessor called RXMUTE. This goes high when a valid signal is received on frequency, that includes having the right PL/DPL. Run a 4.7k resistor from this line to the base of a common NPN silicon transistor, such as a 2N2222, ground the emitter, and bring the collector anywhere you want. The transistor will turn on and the collector go low when the receiver hears a signal. This will be adequate to drive just about any repeater controller or external circuit you desire, including the PTT line of another radio. Around here, we bring the COR signal out to the MIC jack pin 1, which is otherwise unused. All the signals you need are thus available on the MIC jack for using the radio as a repeater receiver or transmitter.

By the way, this is just about the same circuit that's in the GM300 radios.

Hope this helps.

Bob M.