[Amps] QRO Technologies HF2000 plate choke, cont.

[jim.thom jim.thom@telus.net]

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