[Towertalk] Shunt Feed Tower

[Jim Johnson - KC4HW]

Sorry looking to match at 1845...

On 22 Oct 02, at 22:44, n4kg@juno.com wrote:

> 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
> > _______________________________________________
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> > 
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> > 
> 
> 
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Jim Johnson, KC4HW
Melbourne, Florida
http://www.kc4hw.net
DXCluster RF Connection: 144.95
Telnet://kc4hw.homelinux.net:8000