First HF radio..incensed a week ago...I think I blew up my uBitXv4.
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I have used my uBitx's a lot for portable use (Flora Fauna) the last year, with over 3000 QSOs logged in 2020 mostly on 80m, but also 160m, 60m and 40m. Mostly SSB, but also CW. I use Li-ion battery packs 16-20v and feed the PA with this voltage directly to get a few more W output power. I've used lots of different antennas with unique mounting styles for every "field day", sometimes SWR is as bad as 2:1. (it depends a lot on how high up in a tree I can get the line) that holds the antenna centre point up. I usually use a resonant antenna without any tuner.
I've never blown an IRF510, so I'm not sure that an increase in reliability really is needed :-)
73 de SM4VEY - Jonas