Scott,
Congratulations on the progress you're making on your new antenna system.
Adding a KT34-XA only 14 feet below your C-51XR at 52 feet will seriously
degrade the performance of both antennas. My advice: don't do it!
If you need a dedicated antenna for Carribean/S.America, place it on another
tower or pole many wavelengths away from your new tower.
Good luck with the rest of your project.
73
Frank
W3LPL
---- Original message ----
>Date: Tue, 9 Sep 2008 09:48:52 -0500
>From: "Scott Dickson, W5WZ" <W5WZ@arrl.net>
>Subject: [TowerTalk] Interactions btwn stacks and other antenna on same tower
>To: <towertalk@contesting.com>
>
>Thanks to all who have offered help both here and via direct correspondence
>as I've planned and pondered my station build.
>
>
>
>My tower and antenna project is moving along; we stacked 116' of Rohn 55G on
>Saturday. Guy wires are Phillystan, with 20 feet of EHS at the lower ends
>to attach to the guy posts. The next order of business is to mount the
>antennae. I have been planning for 2 years to install the 3 Force 12
>antennae in a similar fashion to what W5IZ formerly had and what VE1JF
>currently has. Now I have acquired a KLM KT-34XA that I want to mount fixed
>toward the Carribean/S.America.
>
>
>
>I understand that the better solution would be monobanders, stacked to
>optimize each band. However, that is not currently possible, and thus is
>not part of the question at this time.
>
>
>
>
>
>
>
>As I have zero antenna modeling experience, MY QUESTION IS:
>
>* * *What effect will the addition of the KT-34XA have at 14' below the
>bottom antenna in the 3-high stack? The bottom C51XR at 52' will be fixed
>toward Europe, and the KT-34XA at 38' will be fixed toward Caribbean.
>
>
>
>
>
>For further understanding:
>
>My plans for antenna installation are:
>
>Force 12 C-51XR at 118 feet, rotating on M2 2800 - Covers 10, 15, 20 & 40
>meters
>
>Force 12 C-31XR at 85 feet, fixed toward Japan - Covers 10, 15, & 20 meters
>
>Force 12 C-51XR at 52 feet, fixed toward Europe - Covers 10, 15, 20 & 40
>meters
>
>KLM KT-34XA at 38 feet, fixed toward Caribbean - Covers 10, 15, & 20 meters
>
>
>
>Antenna Switching will be accomplished via Array Solutions SixPack(s)
>
>
>
>Antenna phasing/stacking will be accomplished via Array Solutions StackMatch
>boxes
>
>--3 antennas for 10, 15, 20 using the 3 Force 12 tribanders. Because all
>antenna will not rotate, my installation will initially provide for
>upper-lower to Europe, and upper-middle to Japan.
>
>--2 antenna for 40 meters, allowing for upper-lower to Europe, and upper
>only to Japan
>
>
>
>The KLM KT-34XA at 38 feet, fixed toward Caribbean will not be included in
>any of the 4 stacked sets.
>
>
>
>View my HFTA output graphs and terrain profiles at:
>
>http://w5wz.com/main/page_terrain_profiles__hfta.html
>
>
>
>To Europe
>
>40 meter stack -- 2 over 2 at 118'/52'
>
>20 meter stack -- 3 over 3 at 118'/52'
>
>15 meter stack -- 4 over 4 at 118'/52'
>
>10 meter stack -- 7 over 7 at 118'/52'
>
>
>
>To Japan
>
>40 meter stack -- 2 over 2 at 118'/85'
>
>20 meter stack -- 3 over 3 at 118'/85'
>
>15 meter stack -- 4 over 4 at 118'/85'
>
>10 meter stack -- 7 over 7 at 118'/85'
>
>
>
>To South America
>
>40 meter -- 2 elements at 118'
>
>20 meter -- 3 elements at 118' or 5 elements at 38'
>
>15 meter -- 4 elements at 118' or 5 elements at 38'
>
>10 meter -- 7 elements at 118' or 5 elements at 38'
>
>
>
>
>
>--Scott Dickson, W5WZ
>
>--Calhoun, Louisiana
>
>-- www.W5WZ.com <http://www.w5wz.com/>
>
>
>
>--Member of Louisiana Contest Club
>
>-- www.LouisianaContestClub.org <http://www.louisianacontestclub.org/>
>
>
>
>_______________________________________________
>
>
>
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