Using an Ethernet cable with standard wiring, the ground connection uses pin 5 of the Ethernet connector, which is usually blue-white. A standard silicon signal diode such as the 1N4148 (almost anything will do), and an RJ45 Ethernet connector to fit the microphone socket. It didn’t take long to reach success!Ī USB-TTL adapter such as those easily available on eBay was used, which cost around £1 (or a little more with genuine chip-sets on). Seeing they were available cheaply on eBay, and knowing the likely ‘guts’ of such a cable, I decided to experiment with some standard designs. While experimenting with radios for the MMDVM Project (and here), I needed a programming cable for some Motorola GM340 and GM380 radios.Ī friend of mine had access to the programming software through his job, but couldn’t locate his programming cable for these radios.
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