I'm not sure what to make of this either. I have all 3 soundcards, and the FA-66 seems more sensitive to close RF than the other 2 cards. It seems to desense. With the D-44 I have been able to work for example 75 SSB and and do CW DXing on 160, 80M or 40 running >1kw, but I notice I can't do that with the FA-66. I have 2 verticals on 80 that are about 120ft apart and I have measured +20 dBm on the antenna that is connected to the SDR when transmitting >1kw on the other antenna, so it is a very stout test. I run the FA-66 at 192khz and the D-44 at 49K so that may be part of the difference. Also when I had a FT-1000D it was not nearly as bullet proof as you describe, so I wonder what "mods" have been done to improve the FT-1000. Also if the feed line of the dipole runs close to the transmitting antenna you may be picking up a lot of common mode on the feed line which may mean the "antenna" is much closer to the vertical than you might imagine.
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