On 1/30/2014 11:03 PM, Carl Braun wrote:
If I can't get the antenna to resonate using the L I'd say that I'd consider
shunt feeding the tower and work out an (omega) matching scheme to match the
tower to my target freq. If that's the case, do I mount my upper shunt arm on
the tower at 67' or at 90'?
Can I run a single drop wire into my panel and then switch the feed between two
matching networks? One for 160 and one for 80?
Please advise
Thanks
Carl AG6X
Carl,
Why not just run a slant wire to your shack and feed the bottom against
a ground system through an ATU. Don't expect any real drama on 80 meters
as the tower is probably to long electrically. ut a slant on any
frequency could be modeled to see what you choices are. The only way
this could change if you made a decoupling sleeve on the tower so the
radiator appear to be between 1/4 and 3/8 wave length. It can work as a
duo bander but it will require some extra work and a good vacuum switch
since the voltages may be high at the in/out switch point. Some
directive in the direction of the slant may occur but it should be be
slight. As far as a drop wire shunt is concerned: There should not be
any advantage of having the drop wire shunt arm much higher than the
approximated sweet point for you tower.
Herb Schoenbohm, KV4FZ
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