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2

More critical than power is length. As a rule of thumb, over distances less than 1/10th the wavelength, metal strips, ordinary wire, or anything you might use to conduct electricity is probably fine. Longer than 1/10th the wavelength, and the "wires" start to look more like "antennas", leading to unintentional reception or radiation. In these cases it's ...


4

There is no such thing as a minimum power level at which a conductor will start radiating. If it radiates at all, then the radiation will be proportional to the power applied. Therefore, the maximum usable power in this circumstance is the power at which such radiation will interfere with (or damage) the receiver, and in order to know it you must test ...


1

You might find it more cost effective to buy a relatively inexpensive, lower power radio (even QRP class), and couple it with an amplifier to get your desired power level. There is a fairly broad selection of lower power "all-band" portable/mobile HF rigs available, some in "some assembly" form for under US$200. For only 100W output, you ought to be able ...


0

I would always just plan for car battery. Ubiquitous, high current output, easy to charge. Probably overall the cheapest solution. Perfect for stationary backup and always on hand when driving with a car. But yes, for back packing, weight concerns Li-Ion is of course the best choice. And you can get the Li-Ion as standard round cells, and create your own ...


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