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Author Topic: Power Limits for Aluminum Wire Horizontal Loop  (Read 2878 times)
G3TXQ
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Posts: 1464




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« Reply #15 on: August 10, 2012, 06:19:07 AM »

That "Loop Skywire" must be some antenna: the author says that other users invariably dismantled their other antennas, including beams, in favour of the Skywire!

Steve G3TXQ
« Last Edit: August 10, 2012, 06:20:39 AM by G3TXQ » Logged
W4OP
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Posts: 393


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« Reply #16 on: August 10, 2012, 06:44:43 AM »

And if it doesn't radiate most of its energy straight up (on its fundamental 1 lambda frequency) then it calls into question all those antennas using quad driven elements.

Dale W4OP
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G3TXQ
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« Reply #17 on: August 10, 2012, 07:15:18 AM »

Recent editions of the ARRL Antenna Book have a much more "considered" assessment of the Loop Skywire's capabilities, including the observation that the low SWR observed by "early proponents" indicated that "cable losses were part and parcel of performance".

The ARRL Antenna Book plots show the Skywire at 40ft on its fundamental frequency is inferior to a half-wave dipole 10ft lower, for a take-off angle of 10 degrees at all azimuth angles. The loop does better on higher frequencies.

Steve G3TXQ
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WB6BYU
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Posts: 13037




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« Reply #18 on: August 10, 2012, 09:18:46 AM »

I've used horizontal loops a lot over the years.  In my experience, maximum radiation
is straight up (on the fundamental. depending on height above ground), in accordance with
models, but there is also some low angle radiation that allows for DX contacts.

On the even harmonics there is an overhead null in the pattern.
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