Surplus Radio Guide Series, Programming Motorola Maxtrac & Radius models

※ Download: Motorola gm300 programming cable pinout

I have also couple radios cross band. Here are the signals on the various pins.

The high zero effect is present. The photo is provided by Alexander 'Gulliver'. It may fail to work in some cases.

Surplus Radio Guide Series, Programming Motorola Maxtrac & Radius models - Please do not apply for the software!

Programming cables programmers for most types of radios are based on the same principles. Progamming circuits for several motorolx types are shown on Fig. Programming cirquits of various radios Fig. A thorough analysis of radios programming cirquits leads to the following programmer schematics. Programmer connectors to radios jacks for mobile radios are shown as they are plugged into sockets Fig. It may fail to work in gm300 cases. Use 78L05 with an external power source only. Multiwire cable with low mutual capacitance among wires is also applicable. Otherwise TxD to RxD interference may result in programming failure. It is convenient to use an additional connector for attaching particular radio jacks to the programming cable. Radio sockets have prominent rubber rings, thus standard stereo jacks cannot be plugged in firmly. The jack flanges should be ground off till 5 mm in diameter. The jack cases should be cut accordingly. Common cables transmission and reception motorola is used. This cable connector includes separate Tx and Rx data lines and a power supply from the radio. This connector does not need an external power motirola if it is provided from the port by a programming software. The specific jack is used, it is shown on Fig. The programming cable is calbe powered from the port. The power supply can be taken from the radio power supply or the accessory connector if available. A connection to devices with a non-standard processor supply programming cordless and cellular phones requiers a specific connector. A TxD key power is taken from the phone, so the input logic levels cannot exceed cablr processor supply voltage. R1 resistor may be omitted because the phone RxD cirquit has an inner 47 kOhm resistor to the ground. The programmer is used as a non-inverting buffer. They can be omitted if desired. Both jacks should be plugged in simultaneously. These radios are designed and manufactured in Russia. There are no hardware flow control cirquits in the connector. The Siemens specific connector is shown. The Siemens phone socket pinout is taken from. For more information please search specific cell phone sites. In order to print it save to disk. Print it, it will be of the right size. The recommended value of Rind is 4. The programming cable was tested with 172 device types, i. The author does not collect and does not distribute radio programming or service software. Please do not apply for the software!. pinout

Programming the GM300 on Windows 7
Now it is capable to program T3000 series handheld radios. In this case the cable can not be powered from the port reliably. Long series in multiple parts starting with the Motorola family of commercial radios. I've worked with Motorola 2 way radios for over 30 years. The gm 300 was a 2 channel a 8 channel or a 16 channel the m120 was 2 channel only I believe and the maxtrac was 2 8 or 16 or 32 channels. Some software especially made by Motorola gives no power from the port, so external power is needed.