[TowerTalk] Gizmotchy's

[Jim Hargrave]

   >-----Original Message-----
   >From: towertalk-bounces at contesting.com
   >[mailto:towertalk-bounces at contesting.com]On Behalf Of Larry Banks
   >Sent: Thursday, April 09, 2009 16:19
   >To: Dan Zimmerman N3OX; towertalk at contesting.com
   >Subject: Re: [TowerTalk] Gizmotchy's
   >
   >
   >Hi Dan,
   >
   >You said this far better that I did!  Thanks for the better explanation.
   >
   >For the record, I used a 2M yagi at 45° for a few years to "optimize"
   >(compromise?) both SSB and FM.  Worked.  Turned out is was great for
   >directing Fox Hunts -- with the tricks the foxes did.
   >
   >73 -- Larry -- W1DYJ

Larry,

I have a better idea. I have a 14 element Hygain 2m beam. I installed a TV
antenna rotor mounted horizontal at the midpoint of the Boom and rotate the
beam vertical for FM and horizontal for SSB and anywhere in between for
possible phasing. I modified the rotor and installed limit switches and do
not use a control box. I just added a On/OFF/ON switch to the my main
controller. It has operated great for the past 20 years.

   * 73's Jim W5IFP *

   >
   >
   >----- Original Message -----
   >From: "Dan Zimmerman N3OX" <n3ox at n3ox.net>
   >To: <towertalk at contesting.com>
   >Sent: Thursday, April 09, 2009 11:52 AM
   >Subject: Re: [TowerTalk] Gizmotchy's
   >
   >
   >> >
   >>> If it's really both
   >>> horizontally and vertically polarized (not circular)
   >>
   >>
   >> Anything that's not elliptically/circularly polarized is
   >just linearly
   >> polarized, and the "ratio" of vertical to horizontal response
   >just depends
   >> on the tilt of the elements with respect to horizontal and vertical.
   >>
   >> A yagi rotated 45 degrees from horizontal or vertical using
   >its boom as
   >> the
   >> axis is a linearly polarized antenna that responds equally to
   >horizontal
   >> and
   >> vertical signals.  But if you have an ionospheric fade going with
   >> polarization rotation of a linearly polarized wave, it's going to work
   >> exactly like any other linearly polarized antenna.  When the
   >incoming wave
   >> is cross polarized with the antenna, you get maximum fading.
   >>
   >> So no matter how fancy it gets, if it's not designed for
   >> elliptical/circular
   >> polarization, it has *one* tilted polarization.
   >>
   >> 73
   >> Dan
   >> _______________________________________________
   >>
   >>
   >>
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