[amsat-bb] Re: Crossed yagis

[Edward Cole]

To add to Arts reply:  this is illustrated in Fig. 8-11 (page 8-10) 
of The Satellite Experimenter's Handbook - Martin Davidoff, 2nd Ed. 
and available from the AMSAT Store.  This book provides in-depth 
information on a wide range of subjects from Leo to Heo.  There are a 
fair number of example formula to assist one in just about any 
question one can ask about satellites.

This is timely question as I am about to retrofit my M2-436CP42U/G to 
switch polarity.  My Heo array has been down for two years and now 
going back into service.  I Love to work on antennas when its 10F and 
snow is on the ground ;-)

A very best to everyone at Christmas and in the New Year!
Ed & Janet Cole
KL7UW

At 09:51 PM 12/23/2007, kc6uqh wrote:
>Andrew,
>Simplest way is to use relay or switch to add a 1/2 wavelenght of coax to
>one antenna phasing line. This will shift the phase by 180 degrees added to
>the 90 degree phase shift will reverse the rotation. You can also swap the
>phasing line connections  to the antennas, but this requires more contacts.
>For 70 cm and shorter wavelengths a coax type of relay should be used for
>best performance.
>
>Art, KC6UQH
>----- Original Message -----
>From: "Andrew Rich" <vk4tec at people.net.au>
>To: "Amsat-Bb at Amsat. Org" <amsat-bb at amsat.org>
>Sent: Sunday, December 23, 2007 7:39 PM
>Subject: [amsat-bb] Crossed yagis
>
>
> > What is the best way to set up phased crossed yagis ?
> >
> > Have an electric coax switch in the middle to switch from left to right
> > circ
> > polar ?
> >
> >
> >
> > 
> ----------------------------------------------------------------------------
> > Andrew Rich VK4TEC
> > vk4tec at people.net.au
> > http://www.tech-software.net
> >
> >
> > _______________________________________________
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> >
>
>_______________________________________________
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73,
Ed - KL7UW
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