[amsat-bb] Linear vs Circular Polarization

Richard Tejera Saguaroastro at cox.net
Wed Apr 12 22:51:36 UTC 2017


Domenici, I8cvs SK had published a pair of articles on making a switching relay between vertical, Horizontal, LHCP & RHCP. he sent me PDF's, which are in my to do someday folder. 

Contact me off list (email is good on QRZ), and I will send them to you. They are for 70cm, but certainly can be adapted for 2m easily enough.

Rick Tejera K7TEJ
Saguaro Astronomy Club
Thunderbird Amateur Radio Club

On April 12, 2017, at 14:11, Brady Gordon <ac0xr at lowswr.com> wrote:

Hi Everyone,

I'm working on building a pair of crossed yagis for 2m and 70cm, and I have
some questions.  I apologize if this has been discussed before, but I
couldn't find answers online so I was hoping you all could help me out.

First, it seems easiest to me to build an antenna system that can either
switch between vertical and horizontal linear polarizations, or between
right hand and left hand circular polarization.  Which would be more
useful?  And is it worth the extra effort to build an antenna system that
can switch between all four polarizations?

Also, I've been looking at the different ways of achieving circular
polarization.  I like the idea of using mechanical 1/4 wave separation
between the two yagis so I don't have to cut phasing lines.  Would it be
possible to switch polarizations by putting a relay at the feedpoint of one
of the yagis and switching which side of the driven element the center
conductor and shield of the coax goes to?  I've never seen this done
before, but it seems to me it would work.  Any thoughts?

Thanks and 73,
Brady AC0XR
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