Last night, I went back to just a vertical yagi , single 11 eleme, from crossed yagis.
The copy was really good, like it was when I first tested it before I adde the second Yagi.
Just goes to show what the wrong polarisation can do
---------------------------------------------------------------------------- Andrew Rich VK4TEC [email protected] mailto:[email protected] http://www.tech-software.net
-----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of Zachary Schrempp Sent: Thursday, 3 January 2008 11:33 AM To: Garie Halstead K8KFJ Cc: Clint Bradford; [email protected] Subject: [SPAM] [amsat-bb] Re: AO=51 and Yagi Polarization Importance: Low
I have to agree with Gary. Being able to switch polarization of a linear-polarized Yagi will help, especially at lower elevation angles. At higher elevation angles the signal will be strong enough that it will be discernible on the Arrow regardless of the polarization. However, when the satellite is at lower elevation angles, the ability to switch the polarity so that it matches the signal coming from the satellite will provide a few extra dB of gain, which may be the difference between solid copy and noise. This has been my experience.
73, Zach KM7I
On Jan 2, 2008 4:39 PM, Garie Halstead K8KFJ [email protected] wrote:
Clint Bradford [email protected] wrote:
> You are talking about the two satellites I regularly access using ahandheld radio at about 2.5W and either an Arrow dual-band antenna
> or simply a longer duck.In my experiences, orienting the Arrow 90 degrees in either direction gives no discernable improvement on the RX signal: It's clear and wonderful no matter how I twist the Arrow.
My experience has been quite different Clint. There have been times
when I've noticed a drop in signal strength, rotated my Arrow antenna 90 degrees, to find the signal strength back up. I had been told earlier by an experienced sat op of the FM birds that there would be shifts in polarization during passes that I would have to correct for. It appeared to me his advice was correct.
73, Gary -K8KFJ- AMSAT #32574 Sat VUCC #125
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_______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb