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Re: [TowerTalk] Rectangular loops

Subject: Re: [TowerTalk] Rectangular loops
From: VR2BrettGraham <>
Date: Sat, 16 Oct 2004 00:46:56 +0000
List-post: <>
W8JI replied:

> With the vertical portions of the loop about 8m long & the
bottom of the loop
> about 4m above the ground, fed at the side is something
like 40-j160 (with j
> going down a bit towards 0 across the band, towards where
the loop is
> reasonant) on 40 & varying from 1000+j5000 to 4000+j9000
across 30.
> Is that something that a typical tuner can handle?  I
think I can put two of
> these up at close to right angles & route the feeders to
my balcony on the
> third floor.

Are you placing the tuner right at the antenna, or at the
end of a long feedline?

If at the end of a long feedline, you are in trouble for
loss on 30. If at the antenna, you are in trouble for

40 is workable.

Where the two loops could fit should result in fairly short feeders, say maybe 4 or 5m at the most - perfect for some bits & pieces of ladder line left over from radial-chopping Granny at a previous QTH.

When I moved here, the first antenna I put up was a
vertical doublet, reasonant again somewhere between
30 & 40m.  For convenience it was fed with coax (coiled
to form a choke at the feed point) & force fed by a tuner
in the shack.  It obviously took a hit in line loss on 30, but
usually was better than the current shunt-fed roof tower on

I just don't have a feel for what a tuner might be able to
handle & would prefer to know there's a reasonable chance
of making the loop work before I put one up.


73, VR2BrettGraham


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