On Sat,2/4/2017 12:55 PM, KD0Q-Glenn wrote:
Several places in K9YC's material indicates that bifilar chokes wound
with close spaced enameled wire would have an impedance of
approximately 50 ohms and those wound with close spaced THHN would be
80-90 ohms.
This is correct.
BTW -- I first noted the Zo of these two chokes in a later version of
Jerry Sevick's (W2FMI) book. Quite a few years later, I built and
measured similar chokes and confirmed his results to reasonable
measurement accuracy.
73, Jim K9YC
In Chapter 7 of K9YC's "A Ham's Guide to RFI, Ferrites, Baluns, and
Audio Interfacing" the table for bifilar chokes shows the THHN wound
chokes at 50 ohms and 2/3 of those wound with enameled wire at 85 ohms.
This is a typo. Thanks for pointing that out!
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