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Your mobile HF transceiver draws 22 amperes on transmit. The manufacturer suggests limiting voltage drop to 0.5 volt and the vehicle battery is 3 metres (10 feet) away. Given the losses below at that current, which minimum wire gauge must you use?
Number 10, 0.07 V per metre (0.02 V per foot)
Total wire length is 3m * 2 = 6m (power and ground). Target max drop is 0.5V. #10 wire: 6m * 0.07 V/m = 0.42V drop (Acceptable). Larger gauge number (thinner wire) would cause excessive drop.
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