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Re: [TowerTalk] Thoughts on towers and antennas

To: "Towertalk" <>
Subject: Re: [TowerTalk] Thoughts on towers and antennas
From: "Tony Brock-Fisher" <>
Date: Sat, 14 Aug 2010 07:55:24 -0400
List-post: <">>

With regards to the XA/40 interaction:

I have found that the new M2 version XA has a 40 meter resonance on the boom. 
This is due to the element mounts now being metal (conductive) which means the 
elements provide loading to tune the boom resonance down to 40. I have my 36XA 
9 feet from a 40-2CD. When the two are 90 degrees to each other (elements of 40 
parallel to boom of XA) the SWR on the 40 goes up to 2:1.

I strongly suggest when you build the XAs you insulate at least the D3 from the 
boom to shift the resonance. This could be done either by using the old KLM 
style plastic boom mount (available from DX Engineering) or by using an 
arrangement similar to the driven elements from M2.

A report on results of this would be important new information...


-Tony K1KP

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