![]() ![]() Thankfully, things cleaned up well and after replacing the necessary parts and swapping for a correct cable, things powered up normally and the mobile radio was good to go.Ĭurious for a bit more details about mobile radio installations? Check out our own Dan Maloney’s rundown on installing a discontinued (but perfectly serviceable) Yaesu FT-8900R. As a result, the full 13 V was soaked up by a 1/8 W surface mount resistor which smoldered and burned until a fuse eventually blew, but not before the resistor and pads were destroyed. Diodes whose job would be to protect against reverse polarity were marked DO NOT INSTALL, probably to shave a few cents off the bill of materials. Once the reversed power arrived at the other end, discovered something else. According to the radio schematics, the two center wires carry +13 V and GND, which meant that a reversed cable delivered power with reversed polarity never an optimal outcome. ![]() This would not be a problem if it was used to connect a landline telephone to the wall, but it was a big problem when used to connect the radio components together. The main problem was that the generic RJ12 cable that used to connect radio components had its connections reversed. The destroyed SMT resistor and pads were easily replaced with a through-hole version, thanks to the schematics. Damage could have been prevented entirely with some better design, which explains during his analysis of what went wrong. Things could have been worse, but they also could have been better. ![]() Since the only real casualties were a blown resettable fuse and a badly-burned resistor that damaged the PCB, was able to effect a repair. ’s newly-installed Yaesu FT-891 mobile transceiver failed to power up despite a careful installation, and it turns out to have ultimately been caused by a reversed cable. ![]()
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