From: David Woolley (david_at_djwhome.demon.co.uk)
Date: Wed Jul 02 2003 - 23:12:10 PDT
> The choice of frequency is, in fact, governed, in part, by an ionospheric
> window that extends from about 10 meters to about 10 cm wavelength.
The upper frequency limit is atmospheric, rather than ionospheric and
is somewhat shorter than 1.5cm. The lower frequency limit for SETI
tends to be set by galactic noise.
DBS satellites operate at around 3cm, so the atmosphere and ionosphere
have to be transparent up to at least that sort of frequency.
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