[Amps] QRO Technologies HF2000 plate choke, cont.

[Bob Wilson, N6TV]

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 at telus.net <
jim.thom at 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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