I *assume* you mean an 80 FOOT trylon self supporting tower.
You neglected to indicate on what FREQUENCY you are trying
to match the tower.
It should make a GREAT shunt vertical for 160M where the
top loading should be close to an electrical Quarter Wavelength.
Matching on 80M will be 'tricky' (i.e. I've never actually tried to
match a grounded HALF WAVE vertical).
Tom N4KG
On Tue, 22 Oct 2002 "Jim Johnson - KC4HW" <jim@kc4hw.net> writes:
> Hello Everyone,
>
> Need a little help with shunt feeding a 80 trylon self supporting
> tower. On
> this tower there is a 4 elements for 20m on 36' boom with 4 elements
>
> interlaced for 15m. At 87' is 5 elements for 10m on 24' boom and at
> 95'
> is 2 element on 40m.
>
> The shunt wire (12 gauge) is at 65' space approximately 4' from the
> tower. Have determined that the approximately capacitance at the
> feed
> point is 280pf, however the lowest SWR appears to be about 3 to 1.
>
> Can anyone suggestion something to improve this situation?
>
> Thanks!
>
> Jim Johnson, KC4HW
> Melbourne, Florida
> http://www.kc4hw.net
> DXCluster RF Connection: 144.95
> Telnet://kc4hw.homelinux.net:8000
> _______________________________________________
> AN Wireless Self Supporting Towers at discounted prices,
> See http://www.mscomputer.com
>
> Wireless Weather Stations now $349.95. Call Toll Free,
> 888-333-9041 for additional information.
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