archiv~1: Re: SETI ATNF clams up on 1.451 ghz hit.

Re: SETI ATNF clams up on 1.451 ghz hit.

Dr. H. Paul Shuch ( (no email) )
Sun, 22 Nov 1998 16:56:50 -0500

At 10:35 AM 11/21/98 -0800, Jim Ostrowski wrote:

>What are the chances, if this was all due a big hoax, that Dr. Norris
>would encounter
>a signal in the very same region of the sky quite near EQ Peg less than
>1 percent in deviation from the frequency asserted in someone's fantasy?

Considering the crowded nature of the electromagnetic spectrum in the
vicinity of our radio-polluting planet, those chances are very high indeed.
1 percent may not sound like much, but considering the frequency stability
and accuracy of the equipment used by even *amateur* radio astronomers, it
is a HUGE difference in frequency. Our equipment usually distinguishes one
part in 142 Million in frequency -- that's a channel bin-width (and
assumed signal bandwidth) of less than a *millionth* of a percent!
Correlating two signals a whole one percent apart is like saying I had a
near-midair-collision because there was another airplane in the sky over
Pensylvania while I was flying home Thursday.
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
email work:; home:

"We Know We're Not Alone!"