[TowerTalk] 15 Meter and 40 Meter on the same tower?

[Cqtestk4xs at aol.com]

Not always so.  Out in KH6, I had three KT36XAs at 30 60 and 90 feet  which 
were independently rotated from a 4 le M2 40 meter Yagi with linear  
loading at 80 feet.  As I rotated the 40 meter Yagi there would be no  change in 
the SWR for 15 meter on the lower two, but on the upper one, 10 feet  away, 
the SWR would rise about .3-.4 depending which way they were facing.   So 
there was interaction.
 
Bill K4XS
 
 
In a message dated 6/2/2013 10:36:44 P.M. Coordinated Universal Time,  
john at kk9a.com writes:

What 40m  beam?  If it has shortened elements it is probably not resonant 
on  
15m and I would not expect a problem.  I have a 2el 40m Optibeam  about 15' 
below one of my homebrew 5el 15m beams and I do not see any  interaction.

John  KK9A



To:towertalk at contesting.com
Subject:[TowerTalk] 15  Meter and 40 Meter on the same tower?
From:Everett Jackson  <wz8p at wz8p.com>
Date:Sun, 02 Jun 2013 11:26:12  -0400
List-post:<towertalk at contesting.com">mailto:towertalk at contesting.com>

I  have a 135 ft rotating tower.
I am wanting to put a 5 element 15 meter  beamon a 36 ft boom
and a 3 element 40 meter beam on a 46 ftboom on the  same tower.

How much space is need between them? Or is this just not a  good idea to
start with?

73,
Everett - WZ8P  

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