On Sat, 16 Jan 2010 18:59:18 -0800 "Jim Thomson" <Jim.thom@telus.net>
writes:
> I Checked a bunch of really old e-mail, and notes. The folk's who
> duplicated the KK5DR plate choke, using 1/2" type 43 rod, stuffed
> into the inside of a hollowed out 1" OD Teflon rod
> had nothing but grief. All the rods overheated ! In some cases,
> the rod actually launched itself out the top !
>
> Either 1" type 43 rod is required, [like several type 43, 1"
> Od beads slid over the 1/2" rod].... or several type 43 rods
> bundled together.
>
> Perhaps type 43 material is the wrong stuff to be using for a
> plate choke...esp considering the typ plate load Z's involved ??
Yes, wrong stuff to use. As an experiment, I made a much smaller choke
using #43, then measured the reactance with a small current flowing
through the windings. The reactance dropped dramatically!
Then I used a powdered iron core and that made a huge
difference, with almost no reactance decrease at all.
73,
Charlie, N0TT
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