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Re: [TowerTalk] F12 Delta 240 performance observation

To: "" <>
Subject: Re: [TowerTalk] F12 Delta 240 performance observation
From: SPWoo <>
Reply-to: SPWoo <>
Date: Wed, 19 Sep 2012 11:42:45 -0700 (PDT)
List-post: <">>
Hi John,

Thank you for the reply.  I haven't been able to confirm whether the beam has a 
20db F/B at the resonant frequency.  If that is really true I would consider 
moving the resonant frequency to the SSB portion.  However based on several 
replies I received it seemed the F/B is not only frequency dependent but also 
angle dependent.  Perhaps the F/B would be better at lower angles, whereas at 
higher angles the antenna becomes more omni-directional.  In any case without 
further proof that there is a lot to be gained by moving the frequency I won't 
bother with it, yet.  It's a lot of work tuning a high Q antenna since the 
performance characteristics change with antenna height.  73.

Best Regards,
Jonathan Woo
(970) 646-1711
20dB F/B would be incredible for a short 2el 40m beam AT the resonant
frequency.  You should have adjusted your beam for a higher frequency if
you mostly use the phone band. John KK9A 

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