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
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@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
This is a great paper and solid work. It doesnt have a chance of being implemented on an amateur radio budget or time scale to the point where a solid reliable platform can be flown.
What the satellite group needs is more Oscar 7's (or VO 52's) and Oscar 10...Arsene and Oscar IV were not bad concepts. Face it, we are not going to make "working the world" on an HT a viable proposition.
Robert WB5MZO
From: samudra.haque@gmail.com Date: Thu, 22 Oct 2009 15:16:25 -0400 To: amsat-bb@amsat.org 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 ?
_________________________________________________________________ Windows 7: It helps you do more. Explore Windows 7. http://www.microsoft.com/Windows/windows-7/default.aspx?ocid=PID24727::T:WLM...
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@amsat.org [mailto:amsat-bb-bounces@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@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@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.
__________ Information from ESET NOD32 Antivirus, version of virus signature database 4535 (20091023) __________
The message was checked by ESET NOD32 Antivirus.
participants (3)
-
Art McBride -
Rocky Jones -
Samudra Haque