On 1/21/2020 1:52 PM, David Eckhardt wrote:
I've found the super-flex insulated 'antenna wire' sold by Davis RF is
pretty good for winding larger ferrite cores (bifilar, quadfilar, ...).
No advantage to this over THHN, and I suspect THHN is cheaper. Also, I
find it important to wind 2-wire chokes with two colors to make certain
that turns don't get twisted (bad).
Also I've repeatedly used RG-142 Teflon coax for winding chokes. It's high
power silver coated 50-ohm coaxial cable about the same outer diameter as
RG-58.
RG400 goes it one better -- it's like RG142, except that the center is
stranded silver-coated copper. After discussions with N0AX and others, I
settled on it for my choke designs on the basis of bend radius when
winding on 2.4-in o.d. toroids.
Cookbook is here. http://k9yc.com/2018Cookbook.pdf
No connection to Davis RF other than use their products.
I like Davis a lot.
73, Jim K9YC
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