[TowerTalk] Stacking Antennas

[W0MU Mike Fatchett]

And sometimes it is nice to be able to fire off some RF in a couple of
different directions. 


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-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Pete Smith
Sent: Thursday, March 26, 2009 2:23 PM
To: TOWERTALK at contesting.com
Subject: Re: [TowerTalk] Stacking Antennas

A couple of things --

If you are using 75-ohm hardline, you may want to use it only for the run to
the base of the tower.  If you trim the hardline so that it is an electrical
multiple of a half wave at the lowest frequency you plan to use, it will
repeat whatever the input impedance is at the output end, meaning that you
can run 75-ohm to the stackmatch and 50-ohm from the stackmatch to the
antennas - I did this for a half-dozen years.

As for the Stackmatch, it is a nice piece of gear - but in my case, with
stacked tribanders, I have not found any occasion where the top antenna
alone is better than the stack.  On the other hand, the lower antenna alone,
with its somewhat higher takeoff angle, is better on my path to Europe
during the waning hours of a band opening.

73, Pete N4ZR

At 03:16 PM 3/26/2009, Dave Johnson wrote:
>You said "stack match".  If you are talking about the Array Solutions 
>Stack Match, you may want to check with Jay about using 75 ohm feed 
>line.  His system uses equal length of 50 ohm feed line from the relay 
>box on the tower to each antenna.  How sweet it is to be able to use 
>the high antenna alone, the low antenna alone or both antennas together.
>
>Dave - K4SSU
>
>
>----- Original Message -----
>From: <Cqtestk4xs at aol.com>
>To: <TOWERTALK at contesting.com>
>Sent: Thursday, March 26, 2009 2:03 PM
>Subject: Re: [TowerTalk] Stacking Antennas
>
>
> > In a message dated 3/26/2009 5:39:51 PM Greenwich Standard Time, 
> > nq4u at mtars.org writes:
> >
> > Plans  are to add a stack match.
> >
> > Both antennas will be fed with 75 ohm  hardline cut to proper 
> > length. Wire antennas will also be located on this  tower.
> >
> > Will there be some pattern distortion due to different  antenna spec's?
> >
> > What are some problems that others have had in  stacking two 
> > different antennas such as these?
> >
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > ~~~~~
> >
> >
> >
> >
> > Anecdotal here:
> >
> >>From what I've heard stacking dissimilar Yagis has been met with 
> >>mixed
> > success.  I'm not sure of the reasons.  Boom length and phasing  
> > problems come to mind.
> >
> > I've been stacking IDENTICAL antennas since the 80's and have always 
> > been successful.
> >
> > Bill KH7XS/K4XS
> > **************Great Deals on Dell 15" Laptops - Starting at $479
> > 
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> > leclick.net%2Fclk%3B213153745%3B34689725%3Bo)
> > _______________________________________________
> >
> >
> >
> > _______________________________________________
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> > TowerTalk at contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
>
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