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RE: rotator
- Subject: RE: [amsat-bb] rotator
- From: Scott Avery <wa6lie@xxxxxxxxx>
- Date: Thu, 9 Dec 2004 18:44:06 -0800 (PST)
- Comment: DomainKeys? See http://antispam.yahoo.com/domainkeys
- DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; b=6R5VMCtcqQ7xZMnK3a2deewYHIEESrqfhzXBli9y1KELOX23SlGXzQivlUECJijVGEc8a+/HIE0JZDDQ3e3Pt/T2vGnMqpZel00FcdyyCZxvtgP8YPNpglwNX1iGFWpPe4FNJiSw0JnqE4ZuiAeR3uDPYwcd3O3EaFM0gJwiWKY= ;
- In-Reply-To: <s1b8becf.055@FSGWHUB.usna.edu>
Bob,
How come you make it seem so SIMPLE?
Is that because it is?
It is surprising how many people get away using a J
Pole antenna for LEO's! Not to mention Mobile
stations!
It isn't rocket science, amd Bob, you have proven that
putting up your PCSAT!
73, Scott WA6LIE
--- Robert Bruninga <bruninga@usna.edu> wrote:
> > but I am using an Alliance on its side for
> elevation.
>
> At the risk of repeating myself, (for any
> newcomers),
> remember that you do not need an elevation rotator
> for any LEO satellite, and there are currently no
> AMSATs
> that are not LEO.
>
> All LEO's are below 20 deg 67% of the time
> All LEO's are below 40 deg 90% of the time but 4 dB
> closer when above
> All LEO's are below 60 deg 98% of the time but 8 dB
> closer when above
>
> Thus a small 10dBi gain antenna pointed up about 10
> deg will give
> you almost a CONSTANT gain from THe horizon to
> OVERHEAD.
> And all existing LEO's can be heard easily with that
> 10 dB. THus
> no need for elevation at all. It only adds
> complexity, frustration
> and more to go wrong.
>
> de WB4APR, Bob
> ----
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