Is this a little mistake about the radio dial? I think they confused
MHz with kHz...
> Although an alien transmission could be
> carried on billions of possible
> frequencies, SETI limits itself to a small
> part of the radio spectrum, around 1420
> to 1660 megahertz, the numbers on the
> right side of an AM radio dial, Adams
Worse yet, it is absolutely incorrect. There is nothing about the medium or
the sky noise that favors these frequencies. Highest SNR is achieved over a
larger range than this (about 1-10 GHz at least). In fact, from a gain
standpoint, the same geometric aperture has greater sensitivity at 8 GHz, for
example, although its figure of merit is lower if the same sensitivity limit
The 'water hole' sounds romantic but it has no basis . It is a remnant of the
days--unfortunately slow to pass--when 'magic frequencies' were passed off as
a solution to our lack of technological savvy in making man channel MCSA's.