Rainer, DG1SMD is absolutely right.? EMC issues can be totally unpredictable and often just don't seem to make any sense.?
The best approach with the X6100, IMHO, is to put ferrites on every lead going into the radio. This doesn't guarantee you won't have issues but it will certainly reduce the chance.
I would also be very cautious in using the X6100 with an EFHW antenna for the same reasons. If you are going to do so then I would recommend using an elevated 0.05 wavelength counterpoise attached to the antenna ground and a good common-mode choke on the feedline at the antenna. I mentioned previously that I had some issues with "wonky" SWR readings on the X6100 when using it with my Alex Loop. I fixed that problem with a few ferrites on the antenna feedline but I had never seen any issues of this kind with this antenna on any other portable rig that I own (and I own more that a few).? So the moral of the story is don't underestimate how sensitive the X6100 is to RFI.??
Cheers
Michael VE3WMB
