Changing any element or spacing will effect the antenna pattern and
impedance. All of the elements work together to produce gain and F/B and
if you wish to make changes, you should model the antenna first. Random
changes will likely make the antenna worse. I have never operated 6m and I
wonder why F/B would be important on that band.
John KK9A
To: towertalk@contesting.com
Subject: [TowerTalk] Reflector element question...
From: Geoffrey Way <wayg@cape-vision.com>
Date: Fri, 10 Sep 2010 16:14:12 -0400
I'm converting an old Moseley CL-33 tribander into a 6m beam.
It has a 12 foot boom, so I'm following the suggested layout in the
ARRL antenna book for a 5-element design shown on p. 18-27 of
the 2007 (21st) edition.
My question is, if I have some extra length on the reflector element,
would I get any additional front to back ratio if it were longer? And,
is there a length that becomes too long, having some adverse effect?
Or is it just a case of no further benefit? Perhaps some other effect
that I am unaware of?
--
Geoff Way, KA1IOR
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|