Mike and Jim
Thanks for posting this good info..
Timely for me anyway.
Fred KB4QZH
---- Mike Waters <mikewate@gmail.com> wrote:
> ---------- Forwarded message ---------
> From: Jim Brown <jim@audiosystemsgroup.com>
> Date: Mon, Jan 21, 2019, 11:36 PM
> Subject: Re: Topband: Inverted L improvements - Part 3 (now with data)
> To: Mike Waters <mikewate@gmail.com>
>
> After nearly a year of work, I published a new "cookbook" last month.
> For reasons that are detailed in the accompanying text, I no longer
> recommend coax wound through multiple cores.
>
> The short answer for "why not?" is that it's simply not practical to wind
> chokes that way and get anything close to the same result every time --
> turns must go through the core in the same order, a scrambled turn cancels
> a turn, turn diameter matters a lot, and so on.
>
> The new cookbook uses RG400, 12-2 Teflon/silver pairs, or 12/2 THHN or NM
> pairs, all tightly wound around a single core. There are recommendations
> for chokes in series to increase power handling. There is also data for the
> new 4-in o.d. supersized toroids, which are great for 160M.
> k9yc.com/2018Cookbook.pdf
>
> 73, Jim K9YC
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