[TowerTalk] tri banders vs mono banders

[Jay Terleski]

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

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