Re: L-Band at Ceduna
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From: <stingay_at_email.protected>
Date: Mon, 18 Jun 2007 08:40:56 +1000
Hi Brett and Aidan,
That's looking very promising! Well done. 1000 Jy is not too bad.
Cheers, Steven
On 6/18/07, Brett Reid <Brett.Reid_at_utas.<!--nospam-->edu.au> wrote:
>Hi,
>Aidan and I have installed a test reflector (1.5m offset satellite dish)
>at the vertex of the 30m dish and an L band receiver from Hobart. We
>aligned the dish optically so that the ray from the center of the feed
>goes to the center of the offset dish and on to the center of the
>subreflector. We checked the alignment at 12 GHz using the Optus D1
>satellite and the small K band feed used for satellite TV. We were
>pleased with a beam width and alignment demonstrated with this test.We
>then changed over to the L-band feed. The first scans were pleasing with
>a system temperature obtained of around 1000 Jy. No further alignment
>has been done. We know that a larger dish will collect more of the
>signal. The vertex tube is 2m internal diameter and our experimental
>1.5m reflector does not fill this.
>
>The 2 channel plot that Aidan performed is attached. The 2 channels are
>linears. The frequency is 1400 MHz, The bandwidth is 64MHz. We intend to
>try linear to circular conversion through the quadrature hybrid in the
>morning once we have wound a test helix.
>
>Both the L-band feed and extra reflector should be easily removed for
>other frequency use.
>
>Pictures are to come.
>
>Regards,
>Brett and Aidan
>
>--
>Brett Reid
>Observatory Manager, Radio Telescopes
>University of Tasmania
>School of Mathematics and Physics
>phone + 61 3 6248 5285
>email brett.reid_at_utas.<!--nospam-->edu.au
>web http://www-ra.phys.utas.edu.au/~breid/
>
>
>
Date: Mon, 18 Jun 2007 08:40:56 +1000
Hi Brett and Aidan,
That's looking very promising! Well done. 1000 Jy is not too bad.
Cheers, Steven
On 6/18/07, Brett Reid <Brett.Reid_at_utas.<!--nospam-->edu.au> wrote:
>Hi,
>Aidan and I have installed a test reflector (1.5m offset satellite dish)
>at the vertex of the 30m dish and an L band receiver from Hobart. We
>aligned the dish optically so that the ray from the center of the feed
>goes to the center of the offset dish and on to the center of the
>subreflector. We checked the alignment at 12 GHz using the Optus D1
>satellite and the small K band feed used for satellite TV. We were
>pleased with a beam width and alignment demonstrated with this test.We
>then changed over to the L-band feed. The first scans were pleasing with
>a system temperature obtained of around 1000 Jy. No further alignment
>has been done. We know that a larger dish will collect more of the
>signal. The vertex tube is 2m internal diameter and our experimental
>1.5m reflector does not fill this.
>
>The 2 channel plot that Aidan performed is attached. The 2 channels are
>linears. The frequency is 1400 MHz, The bandwidth is 64MHz. We intend to
>try linear to circular conversion through the quadrature hybrid in the
>morning once we have wound a test helix.
>
>Both the L-band feed and extra reflector should be easily removed for
>other frequency use.
>
>Pictures are to come.
>
>Regards,
>Brett and Aidan
>
>--
>Brett Reid
>Observatory Manager, Radio Telescopes
>University of Tasmania
>School of Mathematics and Physics
>phone + 61 3 6248 5285
>email brett.reid_at_utas.<!--nospam-->edu.au
>web http://www-ra.phys.utas.edu.au/~breid/
>
>
>
--
* * * * * * * * * * * * * * * * * * * * * * * * * *
Assoc. Prof. Steven Tingay
Swinburne SKA Project Leader
Centre for Astrophysics and Supercomputing
Faculty of Information and Communication Technologies
Swinburne University of Technology
Mail H39
P.O. Box 218
Hawthorn, Vic 3122
Australia
Ph +61 (0)3 9214 8758
Fax +61 (0)3 9214 8797
Email stingay_at_astro.<!--nospam-->swin.edu.au
s.tingay_at_optusnet.<!--nospam-->com.au
Steven.Tingay_at_gmail.<!--nospam-->com
Received on 2007-06-18 08:41:53