From: Rich (rlt57_at_access4less.net)
Date: Thu Feb 27 2003 - 14:48:32 PST
----- Original Message -----
From: "Bill St. Arnaud" <bill.st.arnaud_at_canarie.ca>
To: <public@setileague.org>
Sent: Thursday, February 27, 2003 4:25 PM
Subject: SETI public: Newbie question: Has anyone looked at CBR as a
reference spectrum for SETI??
> As far as I understand it, to date all SETI searches in the optical or
radio domain are looking
> for a single carrier beacon. But we know that spread spectrum would be
much more efficient in
> noisy long distance media. The CBR spectrum would be an ideal universal
reference spectrum that
> might serve as a way to extract information from a spread spectrum
transmission. Even more
> outlandish would be to use the CBR as a holographic reference signal to
extract information.
>
> Has anyone looked into this?
>
> Bill
>
> ---------
> Bill.St.Arnaud_at_canarie.ca
> starnau_at_attglobal.net
> 613 944-5603
Hi Bill,
If spread spectrum was really that efficient, why don't Hams use it for
EME (Moon bounce comms)? ;)
CBR (Cosmic Background Radiation) has a massive frequency span. Much of
the lower part is
currently in use by all sorts of users (FM radio, TV, Radar etc) and it
would nightmare filtering them out.
It's a well known fact that ERP wise (power sent), slow narrowband CW
(Morse code/ off-on keying)
is the least expensive to communicate over great distances.
Rich<>
Don't you find it incredible that there are hundreds, (maybe thousands) of
people around the world who are sitting at computers right now writing virus
programs just so they can screw up your PC?
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