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Re: [TowerTalk] interaction between 15mono and tribander

To: "'Chuck'" <>, <>
Subject: Re: [TowerTalk] interaction between 15mono and tribander
From: "Felipe J. Hernandez" <>
Date: Sat, 8 Oct 2011 10:19:10 -0400
List-post: <">>
The Idea was to have a tribander in each tower, in the other tower 
There will be a stack for 20 at 118'/90 ft and a c3 at 50 ft.
Since the c3 is small it fits fine between the guys but in the 15 mtrs tower
I don't have
Room to fit the tribander since the skyhawk is considerably larger.

I just hate to leave out such an incredible performer, this is the original
Skyhawk design.

Back to the drawing board.


-----Original Message-----
From: Chuck [] 
Sent: Saturday, October 08, 2011 9:09 AM
Subject: Re: [TowerTalk] interaction between 15mono and tribander

This idea just occurred to me:

One way to do this might be to put a stacked antenna matchbox up there that 
would select "Upper," "Lower" or "Both" antennas and one could drive both 
antennas in phase on 15 meters.  The 15 would probably need a similar feed 
system to the tribander to ensure they are fed in-phase and there might need

to be some re-tuning done on the antennas due to their proximity.

Chuck W5PR

> It is probably not a good idea to have two 15m beams so close together. 
> It
> may work if they are pointing in different directions, perhaps that is 
> what
> you are trying to achieve.  A model will clearly show any interaction.  If
> you want more gain, I would just mount a second Skyhawk lower on the tower
> and phase them, which would also improve your signal on 10m and 20m.
> John KK9A
> To: <>
> Subject: [TowerTalk] interaction between 15mono and tribander
> From: "Felipe J. Hernandez" <>
> Date: Fri, 7 Oct 2011 15:53:45 -0400
> List-post: <">>
> Guys,
> How bad will it be in terms of interaction between a tribander (skyhawk) 
> and
> a ef-515 5 elem monobander
> About 12 feet apart? My concern is that the tribander would mess up the
> monobander on 15.
> CQ test... NP4Z
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