[TowerTalk] tri banders vs mono banders

[Jay Terleski]

The Application note I mentioned in a previous email is now available on
my web site.

http://www.arraysolutions.com

Goto products the to application notes.

I hope this helps clarify a proceedure for putting two dissimilar beams
into phase.

Jay, WX0B

Jay Terleski wrote:
> 
> All it takes is a two channel scope and the willingness to do it.
> 
> The proceedure will not take but an hour or two depending on access to
> the tower, and you can be certain all is in phase.
> 
> I helped the ham who successfully put the antenna in phase with the F12
> tri-bander. The model was off.  As I remember the model showed 160
> degrees difference and the actual was 180.  Pretty good for software.
> The bottom line was a delay line made from coax made it all play.
> 
> I won't detail the proceedure here but its straightforward.
> 
> I will try to put an app note on my site in the future.
> 
> Jay
> 
> Pete Smith wrote:
> >
> > At 09:45 AM 7/20/00 -0400, Jim Idelson wrote>
> >
> > Hi Jim -- I've seen Jay's answer and I largely concur.  However, phasing
> > between your tribander and the selected monobander below it can be tricky.
> > I recall a message on towertalk earlier this year from a guy who was
> > running a tribander with a monoband yagi, and he had to put in phase delay
> > (in the form of extra feedline) to make it work.  I think the tribander was
> > a Force 12 C-3 ... but you could probably find it in the archive.
> >
> > My impression is that considerations of this sort are what make phasing
> > dissimilar yagis such an iffy deal.  However, if you can accurately model
> > both antennas I don't see why you couldn't just cut and try the phasing of
> > the 2 feedpoints until you found the right delay to give you the desired
> > pattern.
> >
> > 73, Pete Smith N4ZR
> >
> > The World Contest Station Database
> > is back up and running at
> > http://www.qsl.net/n4zr
> >
> > --
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> 
> --
> Jay Terleski
> WX0B - Array Solutions
> www.arraysolutions.com

-- 
Jay Terleski
WX0B - Array Solutions
www.arraysolutions.com

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