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Re: [TowerTalk] 6 or 8 ele 20 meter beam

To: <towertalk@contesting.com>
Subject: Re: [TowerTalk] 6 or 8 ele 20 meter beam
From: "Mike Ryan" <mryan001@tampabay.rr.com>
Date: Thu, 2 Feb 2017 16:36:00 -0500
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
You guys are talking the size that Dan, N4GNR is accustomed to.  His is 10 
elements on a 120ft boom.  Did I mention that the boom was Rohn 25 tower?  - 
Mike

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Jim 
Thomson
Sent: Thursday, February 02, 2017 3:58 PM
To: towertalk@contesting.com
Subject: [TowerTalk] 6 or 8 ele 20 meter beam

Date: Wed, 1 Feb 2017 12:12:24 -0700
From: W0MU Mike Fatchett <w0mu@w0mu.com>
To: Towertalk <towertalk@contesting.com>
Subject: [TowerTalk] 6 or 8 ele 20 meter beam

I am looking to side mount and maybe rotate a 6 or 8 element 20 meter beam 
would anyone care to share their designs?  I have a bunch of aluminum itching 
to become an antenna!

W0MU

##  side mount on what type of tower ?    Maybe rotate  ?   If it
is fixed in direction,  you are stuck in one direction, with half power points 
well  below 48 degs. 

##  dave is right, stacking a pair of small yagis  would provide the same aprx 
amount of gain.  A pair of 204BAs, at 40 lb each, is
a lot easier than  60-88 ft long boom monsters.   Then you can use
the typ  top – bottom – both config.   The monster yagi, at the wrong
height for that particular  time of day leaves you with no options. 

##  with a boom in the 60-88 ft long range, the  tq issue on the tower has to 
be dealt with.  Along with ice + snow loading, ice + wind at the same time.
If the swr is off a bit, then what, haul the monster back down ?   Any type of 
feedline  or balun issue, and again, it has to come back down.   There is  big, 
then
there is too big. 

Jim  VE7RF

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