Topband: Feeding Elevated Beverages

[Jeff Maass]

We have an interesting challenge in installing a European Beverage 
at the Signal Point station in Curacao.

The station has a cliff behind it, in the direction of Europe. You can 
see it in the first photo at:
    http://home.columbus.rr.com/jmaass/Radio/PJ2T_Aerial.htm


It's a vertical rise for around 50 feet, followed by a slope up to a peak
perhaps 200-feet above the station, and then a slope down into 
a bowl-shaped valley. The European Beverage is fed at the 50-foot 
high point, runs up the slope for 600-feet to the ridge, and then 
back down 400-feet. 

The feedline is buried to the foot of the 50-foot cliff, and then rises
50-feet vertically, where it connects to the Beverage through a 
K1FZ  KB-1  9:1 transformer (isolated windings). The unburied, 
vertical feedline is thus parallel to the towers and the 160m inv-L, 
which is supported by the towers about 300-400 feet away.

The question is: do we need to do anything about preventing noise
pickup on the shield of the unburied, vertical coax? An RF choke
at the base of the cliff?  At the feedpoint? At the station?

With temporary feedline, it seems to work, but we'd like to make it 
as quiet as practical before we declare victory.

 Jeff Maass       jmaass at columbus.rr.com     Located near Columbus Ohio
         USPSA # L-1192       NROI/CRO    Amateur Radio K8ND
Maass' IPSC Resources:  http://home.columbus.rr.com/jmaass/index.html
Circleville USPSA/IPSC: http://home.columbus.rr.com/jmaass/pcsiipsc.htm