An ice fishing box to house my ic-7000, an atu, a battery pack. Very crude but solid rack made of pine board I had laying around. This is cobbling of the best sort.
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Put the volt-meter in series with a switch or momentary button. They tend to draw a little power, so you don’t want it draining your battery when you are not using it. If you stick a cig (accessory) port in there too, you could plug in other things, or a usb charger or whatever if needed. I’ve used my pota battery to run a small 12v air compressor, for instance.
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