Topband: New 160M high performance receiving antenna at W3LPL

[Victor Goncharsky]

 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 at 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