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Re: [TowerTalk] Th6dxx swr

To: Lee Buller <k0wa@swbell.net>, Bob Ortasic <rortasic@neo.rr.com>, TowerTalk Reflector <towertalk@contesting.com>
Subject: Re: [TowerTalk] Th6dxx swr
From: Jim Lux <jimlux@earthlink.net>
Reply-to: Jim Lux <jimlux@earthlink.net>
Date: Wed, 15 Oct 2008 14:33:52 -0700 (GMT-07:00)
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>

-----Original Message-----
>From: Lee Buller <k0wa@swbell.net>
>Sent: Oct 15, 2008 9:55 AM
>To: Bob Ortasic <rortasic@neo.rr.com>, TowerTalk Reflector 
><towertalk@contesting.com>
>Subject: Re: [TowerTalk] Th6dxx swr
>
>Bob,
>
>I set the ones I have used for mid-band.  That gave me the best band coverage 
>on 20-15-10.  Make sure you waterproof the traps.  The balun should be good.  
>
>That low to the ground you will not get a good reading.  As the other feller 
>said....stand it up on the reflector vertically.  Watch out for overhead wires.
>
>Lee - K0WA
>


I did some NEC4 modeling of the effects..
See http://home.earthlink.net/~w6rmk/antenna/yagiht.htm

Resonant frequencies change by about 100kHz for a 20m 3 element yagi, comparing 
between 70ft and 6ft off the ground.  Pointing it up helps, soil properties 
also change the effect.

Jim, W6RMK
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