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Asunto:[dxcolombia] rx antennas
Fecha:Jueves, 8 de Junio, 2006  10:33:12 (-0400)
Autor:Alexis Deniz M. 4M5DXgroup <yv5ssb @...net>

 

W8JI's Receiving Antennas

Conventional Beverage's ~580 feet long. Currently only two left, all others removed over the past two years due to lack of performance.  

Specifications @ 15 degree wave angle:

Every 45 degrees from NE to NW. Directivity factor 7.29 dB, Half-power Beamwidth 78 degrees

Arrays of Broadside Beverages 780 x 350 feet. Currently two duplicate systems (spaced ~1500 feet apart with antennas NE, E, SE, S, SW, W, and NW (28 individual Beverages make up this system):

Specifications @ 15 degree wave angle:

Europe, Africa, Asia/Japan, South America, ZL/South Pacific, VK/Pacific.

Directivity factor 13.8 dB, Half-power Beamwidth 42 degrees

 

Arrays of Verticals 70 x 330 feet. One system:

Specifications @ 15 degree wave angle:

ZL/South Pacific, Europe.

Directivity factor 13 dB, Half-power Beamwidth 47 degrees

350-foot diameter circular eight-element array. One system:

This array covers eight directions, spaced every 45 degrees around the compass. It has 22-foot tall top and base loaded elements. Over 1/4 mile of 75-ohm cable is used in this array (and 2500 feet of cable to reach the house).  

Each antenna element is made from 1-1/2 inch chain link fence top rail. The fence rail hinges on these wooden posts with a bolt through the bottom of the vertical rail. The top of the wooden post has a steel pin that fits in a hole in the metal railing, and it is lashed in place.

 

Specifications @ 15 degree wave angle:

All compass directions. Electrically rotatable.

Directivity factor 12.1 dB, Half-power Beamwidth 53 degrees