The W8JI business website is https://www.ctrengineeringinc.com/
73,
Bob, N6TV
On Mon, Nov 8, 2021 at 4:19 PM jim.thom jim.thom@telus.net <
jim.thom@telus.net> wrote:
> U can also buy the ameritron plate choke from Tom Rauch, W8JI...at his new
> business website... CTR engineering.com. These are a more precise,
> tested for resonances etc.
>
> I know several folks who tried to homebrew the ametritron choke..and they
> all blew up on 10m. The issue is... you can buy magnet wire, in 4 x
> different insulation thickness's....which will change everything. The 27 ga
> magnet wire with thicker goop on it, will use more space on the
> former..for a given number of turns..which changes interwinding capacitance
> and also end to end stray C..and resonances will shift about. If the gaps
> are not xact, and precise, u will have a bad day.
>
> It also depends how close to any metal, or dielectric the ameritron choke
> is.
>
> I have heard of at least 5 of the ameritron chokes blowing up in the last
> 7 months....and they were ALL on 17m band... go figure.
>
> Even more baffling is the oem drake plate choke in the L4B...which I
> measured at 154 uh..... which does not seem to resonate in any of the 9 x
> HF bands.
>
> Jim VE7RF
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>
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