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VERSION OF THE SLIM JIM
is the Slim Jim Antenna I made after reading KE5FXU, Richard's article on Hamuniverse.com.
readily attainable parts to assemble it with. It cleaned it up and
made it real easy to look at...as well as functional! In the
pictures below you will see I used PVC tees (Pic # 2) with a 1
1/8" bushing cut from 1/2" PVC pipe.
The tees need to be reamed out
with a 5/8" drill bit for a snug but sliding fit for
For the tuning stub (Pic # 3), I used 1/2"
copper couplers that slide on the 1/2" copper tubing. DO NOT use the
couplers with dimples or grooves in them, these will not slide on the
I soldered an SO-239 connector to the 1/4 WL pipe and then
soldered a piece of solid wire between the 3/4 WL pipe and the center
conductor on the SO- 239 connector. You could solder the coax or
ladder line directly to the sliding couplers. I personally will use
the SO 239 connector on this antenna.
below will help show how it all went together. Maybe this will
give you some more ideas on how to construct your Slim Jim
Pic #1 Full Length View
Pic #2 PVC
Pic #3 Sliding Couplers and tuning stub area at
The pictures below show the
final assembly with the SO-239 installed.
Back view of SO-239 installed
Front view of SO-239 installed after final
(Antenna is upside down in view
I soldered the center conductor to the 'long' side of the
antenna and the SO-239 base plate to the 'short' side.
The gap spacing ended up being 1 1/4". The distance from the
bottom of the antenna to the center conductor on the SO-239 ended up being
I could have left the "tap" or feed points at
Richard's (KE5FXU's project), measurement of 1 1/2" and
4" and would have been fine with a SWR of 1.5 to 1. I got it down to
1.2 to 1 or less across the band!
After tuning for lowest
swr, I then soldered the bushing/couplings in place along with the end
caps at the gap. I love these 'one wave length or longer'
antennae! Actually, if you measure from gap end to gap end
around the antenna, it is about 1 1/2 wave lengths long. The tuning stub
takes up part of that so you could call it an end fed folded "long wire"
or any other name you want to call it.
I think that with a little
more tweaking I could have gotten the SWR down less than that! I
just don't like being perfect! LOL.
back I also built the 2m Hentenna that was on the Hamuniverse.com antenna projects page. I use that antenna
at my home now and can't say enough good things about it.
This Slim Jim performs on par with the Hentenna and I will use the Slim Jim at my QTH in
Arizona when I get there in middle January for the rest of the
I have no doubts that at my location (Florence, AZ.) I
will be able to make contacts in both the Tucson and the Phoenix areas
which are nearly equal distance north and south. That will be a
great test for this design! Thanks for a great website for
Having HAM fun, N9AGT
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