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John Doty wrote: Telamon wrote: Snip This claim is widely made in the hobbyist literature, but I've never seen any measurements to back it up. I've tried to check it myself, and found the opposite: close to modern sources of EMI, the field tends to be predominantly magnetic. You have to be very close the source to see any effect at all: beyond ~0.1 wavelength induction balances the field pretty effectively. First off I did not realize this was cross posted so this is my last post to this thread. I'm not not regurgitating hobbyist claims but my experience in this matter. Although 0.1 wavelength is more than enough to cover a urban lot and your neighbor at short wave frequencies theory does not do justice to a non homogenous environment we all live in. Most electronic noise generators do not have efficient antennas attached to them where the environment easily distorts the electric fields. I have repeatedly experienced predominantly voltage common mode coupling of local noise sources. Without exception mitigation methods against voltage common mode noise were always successful and current mode antennas always picked up less local noise. -- Telamon Ventura, California |
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