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Re: Topband: BOG Antenna?

To: Top Band group <topband@contesting.com>
Subject: Re: Topband: BOG Antenna?
From: steve d <kc8qvo@yahoo.com>
Date: Thu, 9 Nov 2006 12:35:25 -0800 (PST)
List-post: <mailto:topband@contesting.com>
Gary, I studied a similar setup a while ago. Only, I was going to go for the 
wire above ground and the zig-zags in a vertical plane. The wire was to be 500 
feet long and be attached to a rope about 100 some feet long.
   
  The issue with this kind of antenna (the BOG and terminated, as well as 
unterminated beverages) is that the antenna works on the principal of the wave 
passing lengthwise over the wire to induce current along the wire. That current 
is what passes through the transmittion line into the radio. The longer the 
wire the stronger the current (to a point), and thus the stonger the recieved 
signal (using a preamp is a must though as the signal is quite weak). When you 
take that strait length of wire and bent it the radio waves can no longer 
travel along the length of the wire. Radio waves travel in a strait line, so 
any curve or zig-zag in the antenna wire will render it useless. The point of 
the BOG and Beverage antennas is to be directive, high gain recieving antennas. 
Once you bend the wire to any significant degree the antenna looses its 
directivity and sensitivity. 
   
  What I did instead in my situation was build a K9AY switching loop system. It 
will recieve in 4 different directions, or, rather, will null out 4 different 
directions (the lobes are rather broad, not incredibly directive). The recieve 
performence is NOT going to be what you would get out of Beverages, but it will 
be better than all but the best transmitting antennas (if you are running a 4 
square or 9 circle you need no RX antenna HIHI, a full size vertical or dipole 
WAYYYY up probably would work just fine on RX too, the vertical might be a 
little noisy though).
   
  Also remember, there is no harm in trying something new! Thats what this 
hobby is all about. Experiment, learn, and have fun doing it!
  
Steve, KC8QVO 
   
   

 
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