Pete and others,
I have been top loading my towers for several years with high power and have
not had any known incidents. Currently using Force 12 C31XR's. Maybe just dumb
luck.
73,
Howard..K2HK
HK> Date: Fri, 12 Sep 2008 01:31:39 -0400> To: towertalk@contesting.com> From:
n4zr@contesting.com> Subject: Re: [TowerTalk] Log Periodic Choice> > At 11:59
PM 9/11/2008, Gene Smar wrote:> >Another item you need to be aware of: all
elements of an LP are above > >ground. Therefore, they are not suitable for
top-loading a tower for use > >on the lowbands. They also represent a different
lightning risk than a > >grounded-element design. FWIW.> > Just a small
quibble, because I agree with everything else that Gene has > mentioned - my
yagis are all insulated element Force-12 designs, and they > work just fine as
top-loading on 160 at low power (~200 watts). There's a > risk of flash-over on
the top antenna when used this way with high power, > which W8JI suggested
could be mitigated with RF chokes of the proper size > from the element to
ground, which would effectively ground each element at > 1.8 MHz. In this
respect an LPDA would be easier to deal with than an > insulated-eleme
nt Yagi, which would require the chokes at each element.> > 73, Pete N4ZR> > >
_______________________________________________> > > >
_______________________________________________> TowerTalk mailing list>
TowerTalk@contesting.com> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|