Thanks for the clarification Jim!
73, Glenn - KD0Q
On Sat, Feb 4, 2017 at 3:30 PM, Jim Brown <jim@audiosystemsgroup.com> wrote:
> 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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