[amsat-bb] Re: antenna question
Art McBride
kc6uqh at cox.net
Thu Oct 22 21:08:47 PDT 2009
Samudra,
You could use a polar mount and preset mast angle and azmuth before each
pass. That will give you a single axis control. Most antennas are moer that
30 degrees in beamwidth, the system only needs to be close +/- 15 degrees to
have max signal.
Art,
KC6UQH
-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Samudra Haque
Sent: Thursday, October 22, 2009 12:16 PM
To: Amsat-bb
Subject: [amsat-bb] Re: antenna question
While searching for public text concerning Amateur satellites and
phased array antennas, I came across this gem from our very own Tom
Clark, K3IO
http://mysite.verizon.net/w3iwi/electronic_scanning_antennas.pdf,
"Electronic Scanning Antennas for Amateur Spacecraft". I wonder if
this knowhow could be utilized for ground stations to have antennas
that could rapidly switch between different birds by a software reload
function and a intelligent switching matrix ?
How many of you would prefer (if a command station) to have
multi-access to satellites as they pass during conjunction but use a
small antenna farm selectively to access them _simultaneously_.
On Thu, Oct 22, 2009 at 3:06 PM, Samudra Haque <samudra.haque at gmail.com>
wrote:
> Hi, Amsat-BB
>
> Are there any antenna designs that use predominantly rotating
> sub-reflectors and a reflector for tracking LEO birds, in contrast to
> rotating the main antenna structure on booms in the AZ-EL directions ?
> I am aware of multi-LNB antenna arrangements, thought it would be
> interesting to find out ways to keep a fairly large reflector constant
> on the ground and use a smaller steerable sub-reflector or horn feed
> to aim the beam ?
>
> Any ideas ?
>
> Samudra N3RDX
>
_______________________________________________
Sent via AMSAT-BB at amsat.org. 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
__________ Information from ESET NOD32 Antivirus, version of virus signature
database 4535 (20091023) __________
The message was checked by ESET NOD32 Antivirus.
http://www.eset.com
__________ Information from ESET NOD32 Antivirus, version of virus signature
database 4535 (20091023) __________
The message was checked by ESET NOD32 Antivirus.
http://www.eset.com
More information about the AMSAT-BB
mailing list