On 7/29/18 12:43 PM, Jim Brown wrote:
On 7/29/2018 10:15 AM, jimlux wrote:
https://www.youtube.com/watch?v=E-FpeRf3RvQ
I'm not sure if you can get a core of 31 mix in that size.
I've recently finished extensive work on their largest #31 toroid. It is
considerably smaller than what's seen in this video, and it's usefulness
at HF is seriously limited by dimensional resonance.
you're right -that toroid is a significant fraction of a wavelength in
circumference at HF.
And I notice they don't show someone heaving that sucker on to the
winding machine - I'll bet they use a forklift.
So you probably don't want to use it for your 600m antenna choke,
suspended in the middle of the fjord.
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