But there were so many of these radios sold that there are still many around and still in use today Thats why weve put together this guide to programming the Motorola Radius GP300 series two way radios.
Motorola Gp300 Gm300 Software How To Program TheseIf you would like to learn how to program these radios, we will link to a few guides at the bottom of this page.
Motorola Gp300 Gm300 Software Series Two Way![]() We do not cover that method in this guide as there is not enough information about it. It is important that you buy an FTDI chipset USB to serial cable. Because the programming kit replaces the battery, you will also need a 9v supply. Unfortunately, the original cable is long since discontinued by Motorola. ![]() However, it must be noted that we cant give you any help programming. Here are some solutions online including a solution by G1IGV, a solution by KK6JYT and a solution using DosBox. Two factors caused this to turn out better than I thought I didnt have a 1.8mm drill (only 1.5mm), which is the pins barrel diameter, and even so, what would hold down the pins The solution: drill 1.5mm pilot holes, and then drive the pins into them, melting the plastic by applying heat from soldering iron on the back of the pin. Recently, I was given a couple of Motorola Radius GM300 mobile radios, a GM350 and a set of three GP320 one-channel handhelds. Motorola Gp300 Gm300 Software Software To MatchI have worked with Motorola equipment plenty of times, and have over the years purchased RIB and cable kits, and RSS and CPS software to match. But, the gremlins had managed to lose my RIB box and cable kits, leaving me unable to do anything useful with the radios I was given. These converters all share some common traits they sport an FTDI USB to serial converter, and a Sipex SP213 or similar TTL to RS232 level voltage converter. It should be easy to remove the Sipex chip, and bridge the FTDI directly to the DB9 connector, thus creating a direct USB to TTL serial port adapter. The adapter used here is available in many local shops where I live, but any similar converter will do the job. With great care to not cut too deep (you risk damaging the components on the circuit board), use a Dremel or sharp pen knife to make an incision along the red line. On some of these devices, the plastic is not fully opaque, allowing you to see where the circuit boards edge sits. Once you finish the cuts, carefully pry the two plastic halves apart, until you have something that looks like this (the SP213 is the large chip). The TTL signal going into pin TxIN is then converted to a 10-10 volt signal out of pin TxOUT. Similarly, the data signal coming from the serial port into pin RxIN at 10-10 volts is converted to TTL (05 volts) out of pin RxOUT. In this particular converter, the pins used are R4INR4OUT, and T1INT1OUT. As can be seen in the chip layout, the inputs to the FTDI are next to each other, so a simple solder ball will bridge them, and T1INT1OUT will have to be bridged using a wire. You can also use a regular fine-tipped soldering iron and place a big solder blob along one of the rows of pins, then lift up gently, repeat on the other side. This can be solved by cutting the trace leading to pin 1 of the DB9 (which is not used for anything useful), and running a wire from the 5V pin of the USB connector (this is also shown on the above picture). With some luck, the GM300 cable should also program the GM350. Instead, it has a 13-way (what a lucky number to pick) contact pad connector, which doubles for accessories and programming. I assumed from some other schematics found on BatLabs that the same requirements would apply for this cable, i.e. V on the data line, isolation via diode of TX and RXbut nothing worked. Eventually, I tried the simplest approach: bridge the TX and RX pins of the DB9 with a 0-ohm resistor. And it worked. This is the stupidly simple schematic of the GP320 cable. If this rubber piece could be removed, and the plastic used to mount three spring-loaded contactswed be in business. I had used the shortest pin on their catalog for another project, and had a few samples left. These pins can be ordered through DigiKey in small quantities, and they usually keep stock ( part number 0900-0-00-00-00-00-11-0 ). The pins I had were very similar to the ones used in genuine speakermics and programming cables.
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