DL7APV (Bernd) - SK

[9A5R]

Pozdrav svima, 


 jedan od najpoznatijih radioamatera u EME svijetu, Bernd Wilde (DL7APV) je SK 😞


   Njegov sustav za 70cm (128 x 11el.) bio je uz HB9Q daleko najjači signal na bandu. Uvijek spreman za sked sa malim stanicama.

   http://dl7apv.de/

R.I.P. Ben 😞


73

9A5R, Zeljko

[9A5INI]

R.I.P.
Naišao sam na opis antene na Fb


THis is his 432 MHz EME antenna. 
It is made of 128 11 element yagi beams (all home made, designed by a friend of his).   This  means its a 1408 element antenna.   It offers about 33.7 dB gain over a dipole.  THAT MEANS:  If you feed it with 1000 watts, you get an ERP of 2,370,000 watts.
Impressive, but what you may find even more interesting, is there is no coax in the array.   The entire phasing harness is made of open wire ("ladder") line (which he made himself).  This keeps losses VERY low, as open wire line, properly made, is way less lossy than even the best coax/heliax/hardline.    Also, all driven elements are folded dipoles, so there is no loss in "gamma match" rods like in the average Yagi.  Since the folded dipole is a balanced feed dipole, the open wire line is a good way to feed these yagis.
There is a balun at the bottom where the transformation from open wire line to low loss coax takes place, then low loss coax goes to his shack. 
Click on the image to see more detail.    (The Yagis across the top are on 2 meters, all the rest are the 440 yagis, you can barely see their elements.)
73 and happy Monday,
WR8Y
slike: http://dl7apv.de/Neue%20Antennen/Neue%20Antennen.htm