From: Dr. H. Paul Shuch (n6tx_at_setileague.org)
Date: Wed Sep 29 2004 - 06:13:25 PDT
william edmondson wrote:
> the radioastronomy service has primary status in the
> band 1660.0-1670.0 MHz (this for the 2 OH main lines). (Quoted from Gerard)
Not that this "primary status" has afforded us much protection from
Iridium interference.
> So - we may be looking at the wrong frequencies. We'd have to think
> about where to look instead, and one "obvious" (??) place would be the
> 'mid-points' of the H/OH pairings. 1542.9025 and 1543.882 MHz These
> are nicely near each other, and bang in the middle of the water hole.
And, unfortunately, BADLY polluted by the swarm of navigation
satellites blanketing the Earth with RFI! But if we ignore that for
just a moment, I would respectfully suggest that the geometric mean
makes more sense than the algebraic mean (for reasons I can delve into
later). Thus, the two mid frequencies should actually be 1538.032 and
1538.936 MHz.
It's also worth considering the geometric mean of the two main hydroxyl
lines, which comes to 1666.380 MHz.
-- 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_at_setileague.org; home: drseti_at_cal.berkeley.edu "We Know We're Not Alone!"
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