archive: Re: SETI Theoretical question

Re: SETI Theoretical question

Dr. H. Paul Shuch ( (no email) )
Sun, 20 Sep 1998 17:38:14 -0400

At 01:52 PM 9/19/98 +0100, David Woolley wrote:

>Translating it just fast enough to compensate for the earth's rotation,
>will actually keep the source in beam longer and allow longer integration
>times. I believe this is what Arecibo does.
>

Yes, it is. But remember that Arecibo is a spherical, not a parabolic,
reflector. They do not lose gain in the process of deflecting the feed, so
they can track sidereal motion for perhaps three hours. (I'm working from
memory here -- it may be more). We would get only minutes of tracking
before our feed was so far from the focal point that dish performance began
to degrade.

-----------------------------------------------------------------
H. Paul Shuch, Ph.D. Executive Director, The SETI League, Inc.
433 Liberty Street, PO Box 555, Little Ferry NJ 07643 USA
voice (201) 641-1770; fax (201) 641-1771; URL http://www.setileague.org/
email work: n6tx@setileague.org; home: drseti@usa.net

"We Know We're Not Alone!"