Alexanderson day

[Mike Watterson]

Yes,  the old distinction between "induction" and "radiation". Looks like it really has to be a long wire then.

For transmission. A one loop about 1/5th to 1/10th of a wave diameter has to be resonated and the voltages are awesome. HF transmitters with loops DO exist, and they use massive motorised vacuum capacitors absolutely at the remote loop. Multiturn loops are hardly used at all as the voltage on transmit when resonated, which is needed, is massive.

You can run loop cable around a room and drive with a 100W audio amp for hearing-aid audio induction reception.

Simplified version.
For reception it's easy to add gain and loop picks up much less E field, so local radiated electrical interference isn't much received. You are getting the H with the loop. it's only a 1/4 monopole against earth or a one wavelength diameter loop that is getting equal E & H, resonant to Electromagnetic waves.
So for reception as much turns as you can manage around a bookcase or window frame may beat 30 m of washing line, simply because there is less interference. Though a washing line with a low pass filter for the Alexanderson is maybe fine because it's at least half the frequency of any electronic ballast or SMPSU.
The 12V 1A SMPSU of a new satellite receiver wiped out all LW & MW in the house this week. Replacing it with a 12V 1.5A from an old ethernet hub worked (same plug and polarity). I'll try putting it in a metal box with a filter on mains first, then add filter on the O/P if that's not enough.

I've found PC PSUs with all the filter inductors replaced with wire links and capacitors omitted on the mains side RFI filters.

No regulator samples retail sales unless there are deaths.