[amsat-bb] Re: Crossed yagis
kl7uw at acsalaska.net
Sun Dec 23 23:41:13 PST 2007
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
At 09:51 PM 12/23/2007, kc6uqh wrote:
>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
>----- 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
> > _______________________________________________
> > Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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>Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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Ed - KL7UW
BP40IQ 50-MHz - 10-GHz www.kl7uw.com
144-EME: FT-847, mgf-1801, 4x-xpol-20, 185w
DUBUS Magazine USA Rep dubususa at hotmail.com
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