[TenTec] 80M LOOP
Dave
frstbaptistchurch at wyoming.com
Sun Mar 14 18:29:07 EST 2004
I have kept the Paul Carr modeling and installation of 80 mtr loop
with phasing line twisted (450 Ohm line) between opposite corners -
its bit less than 1 wavelength - he did not lose any multi band
performance.
Dave K8BBM
n Sun, 14 Mar 2004 23:07:49 +0100
"Rick Westerman" <Rick at dj0ip.de> wrote:
>
> Sinisa,
>
> You're the theory expert.
> Each time I try to discuss theory, I mess it up, so I'll just
> stay with reporting on my own practical experience and also quote
> 4 other sources where this antenna has been published (confirming
> what I stated).
>
> I stand by my statement that at all the clubs I've belonged to,
> the loop has outperformed the dipole for the type of operations
> needed for Field Day contests. That of course means to work as
> many portable stations as possible, the majority of whom are in
> the same country (DL in my case). I'm not talking about one
> dipole that didn't perform - I'm talking about many dipoles that
> didn't perform. Actually they did perform but the loop simply
> performed better. The 80/40 meter difference was small and
> sometimes the dipole was equal, but it was almost never stronger.
> Usually the loop was stronger. On the higher bands, the loop
> stomped the dipole.
>
> Sometimes the dipoles were fed with coax with multiple dipoles
> fed in parallel. Sometimes we used openwire for feeding the
> dipole and a couple of times some fool actually insisted on
> putting up an FD4 (dummy load).
>
> Each time I moved to a new city, I chose the club that had the
> best track record in contesting.
> These weren't guy who didn't know how to build dipoles.
>
> I could buy into your theory if this had only happened once or
> twice. But it happened many, many times.
> I began using the loops in 1977 right after reading an article in
> the CQDL magazine (September 1997) written by DL3IS.
> A second article appeared in CQDL in January of 1978 written by
> Karl Hille, DL1VU, one of the top authorities on antennas in the
> German ham scene, and finally a third article appeared in June of
> 1978, written by DL2FA.
>
> Each of these claimed great experience with these loops for NDIS
> on the low bands and good DX on the high bands.
>
> Finally, in the early 90', Paul Carr, N4PC, did a series of
> articles on these loops, including modeling on all the bands. He
> expanded it with phased feeding to opposite corners to even give
> low angle radiation with the 80m version (albeit with loss of the
> multi-band feature). I believe the articles appeared in CQ
> magazine, but I'm not sure. I still have them buried somewhere
> in my shack but I couldn't find them tonight. I'll have to
> search for them some other time.
>
> All of these articles and my experience with it (which spans 25
> years) point towards this antenna out-performing a dipole - but I
> couldn't tell you why!
>
> I only hope some day to have enough land to be able to put one up
> permanently.
>
> 73
> Rick
>
>
>
> There is only one explanation for a loop (or anything else)
> outperforming a dipole (or anything else) in ALL directions:
> your dipole is wasting at least 75 % of RF energy.
>
> Instead of claiming that "loop is always better",
> it would be wiser to eliminate the loss.
> And it is certainly not caused by the length of the wire,
> or the shape of it.
>
>
> 73,
>
> Sinisa YT1NT, VA3TTN
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