[amsat-bb] Re: AO=51 and Yagi Polarization
clintbrad4d at earthlink.net
Wed Jan 2 18:39:00 PST 2008
Don't know what I'm doin' wrong...I regularly hit 30 degree elevation and higher passes alone and for demos in front of clubs - and cannot discern with my ears any benefit when rotating the Arrow.
And I still get excited about this...What a wonderful aspect of this marvelous hobby!
From: "Zachary Schrempp" <zach.km7i at gmail.com>
Subj: Re: [amsat-bb] Re: AO=51 and Yagi Polarization
Date: Wed Jan 2, 2008 5:32 pm
To: "Garie Halstead K8KFJ" <khyberpass65 at yahoo.com>
cc: "Clint Bradford" <clintbrad4d at earthlink.net>, amsat-bb at amsat.org
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.
On Jan 2, 2008 4:39 PM, Garie Halstead K8KFJ <khyberpass65 at yahoo.com> wrote:
> Clint Bradford <clintbrad4d at earthlink.net> wrote:
> > You are talking about the two satellites I regularly access using a
> > handheld 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
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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