I was taught this kind of antenna during two semester course at radio
department of Lvov Polytechnic at the begining of 70's. A lot of formulas and
diagrams...
UA1DZ (SK) used this kind of array of 12 vertical elements on 20-10 meters.
Unfortunately no information except the vertical element drawing remained.
73 Vic US5WE
Вторник, 5 февраля 2013, 21:06 -08:00 от "Lee K7TJR" <k7tjr@msn.com>:
>>The "Wullenwever" antenna was never a low-noise high performance antenna.
> It was simply a system designed to find direction over a very wide frequency
>range. The multitude of elements increased bandwidth, but the physical width
>in wavelengths is the primary determinant of directivity.
>
> While I will agree that the Wullenweber antenna was never designed to be a
> low noise antenna, I fail to see why it is not. My copy of TM32-.......
>manual
>on the US version shows some pretty good directivity specs. On the low band
> starting at 2 MHZ the beamwidth was 11 degrees with the side lobes down a
>minimum of 18dB. The maximum elevation was 30 degrees. Also the range
> specified was 4000 nautical miles. And its outer element diameter was
> 1116 feet. The 48 low band elements were 35 feet tall with a 120 foot tall
>reflecting screen. Each element had a 19dB gain semiconductor amplifier with
>a 7 dB noise figure. I agree also that not all the 48 elements were active
> however the ones that are in a given direction produce some outstanding specs.
> So if I compare usual high performance low noise RX antennas to this
>large
> antenna our directivity specs pale in comparison leading me to believe the RDF
> of the "W" system surely would be greater than anything we could imagine with
> our RX antennas. Nor does noise figure appear to be a concern.
> Or is my thinking corrupt?
>Lee K7TJR
>_________________
>Topband Reflector
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Topband Reflector
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