[Towertalk] Shunt Feed Tower

[n4kg@juno.com]

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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