Ah, Litz wire. I have 2 spools i got at a surplus
warehouse around 1978. I had to climb up to the second level of
pallet storage and i thought i had gold, something like 9/38 or
some such, which is totally ordinary, unimpressive today, when
you can buy monster Litz from China. Completely insane number of
threads.
I thought i read that Litz is only advantageous up
to around 1400 kHz. Also, which surprised me, that if one or a
couple threads broke internal to the coil, no big deal.
Fortunately for us though the breaks are always at the solder
junctions, whether by chemical action or mechanical accident.
I still have those 2 spools, actually never used a
foot of it, and now with the China product available, the gloat
factor is much less. I also do have a couple big cylinders of
ferrite, no idea what they were out of. You may think that these
were no doubt for LF freqs, but the one test i ran, with a one
or 2 turn coil at high HF freq, the dipmeter's pointer was
almost pulled out of the machine when it plummeted.
-Hue Miller
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