I already have a photo of the capacitor uploaded in
the photo section as stated in the original post. Here
is a web page that details how to build your on
capacitors.
It takes some time for all the pictures to load. The
drawings for the stator, rotor, and endplates are all
in metric. I made my capacitor slightly larger to
allow using 1/4-inch hardware. 6 mm is close but
slightly smaller and the 1/4-20 nuts would have
extended out past the stator vanes slightly and I did
not want it looking like that. Here is a direct link
to the photo of my homebrew capacitor; I hope it works
anyway hi!
My test loop was made from RG-8 coax used as the
element and an old split stator capacitor. It was
everything you did not want to do in building one!
Small diameter and high loss in the element as it's
not a solid conductor and the capacitor was not welded
across the top of the rotor. I still made contacts on
it! The new Magloop is going to be built without the
built-in losses of the test or fold up portable loop
but will still transport nicely in the pickup bed of
my truck.
--- furman2020 <k5qa@...> wrote:
Please post pictures and diagrams of your new loop
and butterfly cap. I am very interested in building
the same thing, except mabe for 80 & 160. Also,
please give us details on the performance of your
new loop system, compared to dipole or vertical if
possible. Thanks.
Furman2020 K5QA
--- In loopantennas@..., "n4zou"
<n4zou@y...> wrote:
I just finished a project I have been working on
the last few
weeks.
A large Butterfly capacitor for my soon to be
built 20 and 40
meter
transmitting type Magloop. It is 10-pF minimum and
100 pF maximum
with spacing for 12,000 volts. It is made from 15
gauge copper
sheet
metal, 1/4-20 all thread, 1/4-20 nuts, and
Plexiglas. I used
aviation
snips to cut the copper, a drill press for the
holes and a skill
saw
for the Plexiglas. Testing on another 20 and
40-meter loop
requires
17-pF at 14.350 and 91-pF at 7.0 MHz. The loop
will also work on
30
meters as well. I just uploaded photos of the
capacitor in the
photo
section. Just click on the N4ZOU folder. The old
test loop used RG-
8
coax as the element and a split stator capacitor.
You had to add a
second capacitor to get it to work on 40 meters.
This new setup
will
use 3/4 inch copper pipe for the element and will
have continuous
coverage between 14.350 and 7 MHz.
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