Lee, I have a similar problem. 30m rtty when I use my 80m inverted vee will lock up the computer while in transmit. I too am well grounded but attribute it to antenna proximity and feedline length. I have found that adding a short jumper to the feedline will alter it relative to operating wavelength just enough to eliminate the problem. I once had a vertical that I cut a feedline for that just happened to be 1 wavelength for the antenna and I had fits until I tried the jumper trick. Perhaps a better choke at the antenna would have helped too. Whodathunkit? The 30m rtty problem on the 80m hasn't been solved so easily. I just try to avoid the combo, instead using the 30m vertical but there are times when one antenna works better than the other. I don't think my xyl will go for a Farraday cage. What's the old fishing joke about going fishing one more time? Just trade that for antennas or ham gear, hi hi. gl, Jim W5QM
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