Your transceiver's user guide suggests limiting the voltage drop to 0.5 volts and the vehicle battery is 3 metres away. Given the losses listed below at the required current of 22 amperes, which minimum wire gauge must you use?

Why

Number 10, 0.07 V per metre is right because the total wire run is six metres (three metres out and three metres back), and multiplying six by 0.07 gives a drop of 0.42 volts, which stays safely under the 0.5 volt limit. The full explanation — and one for every question — is in Pro.

Practise this section

Station assembly, practice and safety is section B-003 of the Basic exam: Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.

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