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Re: [TowerTalk] 80 Meter Quad Bandwidth

Subject: Re: [TowerTalk] 80 Meter Quad Bandwidth
Date: Thu, 6 Nov 2003 21:40:29 EST
List-post: <>
In a message dated 11/6/03 9:09:44 PM Eastern Standard Time, 
>>Two element quad with .15 wavelength spacing one element on each side of 
the tower in a "diamond" configuration (points up, down, L & R) bottom about 
off the ground, feeding the DE at a corner for vertical polarization.

1.  How much might the vertical tower in the middle of a                      
   vertically polarized quad degrade its performance?

2. What kind of a bandwidth should I expect?  Can I tune it for             
3.7 MHz and work from 3.5 to 3.9 MHz?

1. To find out, it would help to model that in software. It depends on 
dimensions and stuff around it. If there were right dimensions, the tower could 
as "dummy" director like in OWA antennas and widen the B/W.

2. That is normally too much B/W to expect. You could tune it for minimum SWR 
using tuner or matching, but gain and F/B would be off at extremes. Normally 
it is advisable to use loading stub or coils to insert with relays in both 
elements for lower end of the band.


See:  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.

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