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" <k7...@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 _________________ Topband Reflector