My 7K seems to be happy on a standalone battery for portable use. ?You can't run 100 watts -- but 25 watts is only one S-unit down. Mine will reliably deliver 35 watts TX PO at 10.9 VDC (measured at the radio). ?You really don't want to discharge a deep cycle battery much below that, anyway.

?It's no worse than an FT-857 or IC-706, in my experience -- once you remove icom's deficient fuse holders on the power cord that can drop over one volt at full load.

The drop of TX PO with supply voltage is a function of the PA FET specification primarily and is no different from its competition, in my tests. ?It could be designed to supply 100 watts at 11-15 VDC on HF, with extra cost and heat dissipation, but the battery's charge would plummet rapidly.

Of course the battery has to be sized for the task and well maintained over time, also. ?I use retired 80AH AGM batteries that are cycled out of commercial UPS systems every 3 years.

Steve, W3AHL

The 7000 is my?only DXpedition radio for?operating?portable from remote locations on battery power. My?equipment must work or the entire trip is?an expensive waste of time. I go small, light and the very best quality in all my gear.?The whole station fits in my backpack and I usually operate at?25 watts or more for about?two hours (often in pile-ups) from a 26 ounce, A-123,?4S2P, eight cell?nanophosphate battery. I take two with me and charge them while back at the villa or base for lunch. I have squeked as many as 200 contacts from one battery. I have?over 300 (40 minute) charges on each and they are as strong as ever. They will be called on again in February for a trip to the island of Bequia in the West Indies.

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So the 7K on batts is both possible and very rewarding.

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73, Dan WZ1P???

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