At 11:52 AM 6/18/2007, WW4T@aol.com wrote:
>A couple of weeks ago, we were in Hawaii for the first time, and visiting
>the famous "Diamondhead" Crater on the edge of Honolulu.
>
> There is a military installation inside the crater, and the main tourist
>attraction is to climb the inside of the crater to the old military bunkers
>that are built along the rim of the crater overlooking the ocean
>and Honolulu.
>
> To get to my point, as we were leaving the crater area on a tour bus
>afterward, I got a quick glimpse of an unusual antenna that I had never seen
>before.
>
> There appeared to be a couple of missing elements and a generally rundown
>appearance. It obviously was part of the military
>installation, but appeared
>to be in a state of disrepair.
>
> It looked like a large "corner reflector" antenna, BUT was in the
> HF range
>by the apparent size of the elements, plus it appeared to be a "staggered"
>element, log periodic design.
>
> It was joined together at the "small element" end, with the larger
>elements being on the open end.
I've seen this antenna.. it's a pretty standard big log periodic
design. The doubled antenna increases the gain over what you'd with
a single LPDA. The tapered spacing makes the spacing between the
active radiating sections more constant (in terms of a fraction of a
wavelength).
There's an example of a smaller one of these in Kraus's book
Jim, W6RMK
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