In rec.radio.amateur.homebrew Reg wrote:

Simple way. Wind a single layer 175uH choke on a ceramic form
with 24-26 wire. Good for 600ma and 160-10M.
I use these on all my HB from 30W to 1KW.
73 W7ZFB
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I'm interested.
What is the approx diameter and length of the form and approx number
of turns?
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Reg.
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No turns depends on dia of form but the size of the form don't matter.
I use forms from fried chokes, 3/8 inch to 1 inch.
With 26 wire and 3/8 dia, expect 3 inches of winding or so then use
analyzer to get about 170uH and check for zeros around 23MHz and a
second around 33MHz. Tweak the 170uH to get the zero at 23MHz in
situ but with the PINET unhooked...
GL 73 W7ZFB