Topband: New 160M high performance receiving antenna at W3LPL

Tom W8JI w8ji at w8ji.com
Thu Feb 14 14:08:31 EST 2013


My question for this astute reflector is whether there is any reason 
multiple receivers can't be connected to the array - listening in the same 
or different directions. Simply by multiple layers of the same RF switch 
matrix with proper selection/phasing etc. Would a magic T be required from 
each element into the separate switch matrices?

Frank or Tom - are you already doing this? >>>>

You could split at every element, but unused splitter ports would require 
termination in case that element was used for another phasing hub. This 
could all be done at the array center, only one feeder to the element would 
be required. The other cables would be short, since they would all be at the 
hub.

My gut feeling is it would be pretty easy to build an adaptor module that 
would satisfy the splitting. I have not done that here, but I have 
considered it.

There is another phasing method that has no relay switching, but has eight 
directional ports. But that is too expensive and complicated.

I have done two-port sharing and independent selction for Beverage hubs, at 
least I have a box that allows two ports to feed any one of eight antenna 
ports (any port, not just unused ports). I built this box for economy of 
long cables. Since some antenna hubs are 2000 feet away, it would not make 
sense to run six or eight 2000-foot feeders from two or three hubs.

73 Tom




 



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