Another solution to the high voltage problem at the
insulated end elements of F12, KLM, and X7 / X9
antennas would be to install a relay to short the
center of the end elements to the boom when
you want to use the tower as a vertical, leaving
the relay OPEN when you use the beam.
On Thu, 07 Feb 2002 16:52:06 "Howard Klein" <email@example.com> writes:
> SNIP K2HK
> What effect does grounding the elements have on the performance of
> >the beam?
> SNIP N4KG
> >MOST = All Cushcraft and HyGain tribanders and monobanders
> >except for the Log Cell DE's in the X7, X9, TH11, all Mosley
> >beams except for the insulated DE's and LP antennas.
> But of course I was thinking of the exceptions. I use an X-9 on a 70
> tower which I shunt feed. I rarely have arcing problems unless
> goes out of whack. This occasionally happens when we get some winds
> blows my shunt wire around or gets my feed lines swinging in the
> Fortunately my Acom shunts down quickly and does send the arc fault
> msg. I
> use a Gamma match but find I need better than a 5K vacuum var. I
> measure the
> capacitive value in the order of 300pfs.
> Howard M. Klein, K2HK
> ARRL Life Member
> DXCC Honor Roll
> 362 Confirmed Countries
> A1 Operators' Club
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