[TowerTalk] TH11 Modeling and Question abt 20 meter Director

Mike Cizek mikew3mc at gmail.com
Sat Aug 27 08:28:15 PDT 2011

I would also be interested in an EZNEC model for the TH-11, if anybody
has one.   Thanks.


Mike W3MC

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Dennis W0JX
Sent: Saturday, 27 August, 2011 09:04
To: towertalk at contesting.com
Subject: [TowerTalk] TH11 Modeling and Question abt 20 meter Director

Does anybody out there have an EZNEC or other model of the TH-11? I am
curious as to why the 20 meter director is the second element from the
boom front end which makes the total 20 meter spacing 22 feet instead of
24 like on the TH6. What would happen if the 10 meter/20 meter element
was placed first and then the 17 meter/10 meter element second? I wonder
if this is just a compromise for impedance matching on 20 and 17 since
the 10 meter directors would essentially remain in place.

Theoretically, putting the 20 meter element out from should improve
bandwidth and increase the gain slightly.

73, Dennis W0JX/8

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