Warren,
this looks like a good start. Are the elements isolated on the 4-40? I am
assuming that they are and ran a quick simulation that shows the shunt feed
working well at about the 50' level. If you give me dimensions and such I will
be glad to do any simulations for you.
I would not bother with the 35 foot mast- you want as much vertical height as
you can get to get the radiation resistance up.
Dave WX7G
----- Original Message -----
From: WarrenWolff@aol.com<mailto:WarrenWolff@aol.com>
To: towertalk@contesting.com<mailto:towertalk@contesting.com> ;
topband@contesting.com<mailto:topband@contesting.com>
Sent: Sunday, December 26, 2004 12:29 PM
Subject: Topband: New Antenna
Greetings,
I have a question about choices on 160 meters.
I expect to have a new home at Lake Havasu City next summer.
I will have a 60/70 foot fixed tower topped by a couple of OptiBeams
(16-4 and a 4-40).
About 100 feet away, I expect to have a 30/35 foot flag pole.
What is my best way to get on 160 with this arrangement? A couple
of ideas come to mind.
1) Shunt feed the tower
2) Use a wire between the top of the tower and the top of the
flagpole to use as top loading for vertical wire in the center
of it.
3) Extend an arm out from the top of the tower, say around 6-8
feet and drop some kind of vertical element to be base-fed.
Advice is needed; please donât say I am nuts.
Warren; W5KKW
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See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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