From: Dr. H. Paul Shuch (n6tx_at_setileague.org)
Date: Sun Jan 19 2003 - 06:18:39 PST
At 08:54 PM 1/18/03 +0000, David Woolley wrote:
>> signal having a suppressed carrier, might we also consider using a =20
>> frequency hopping method to increase the signal energy?
>I don't see how this increases signal energy.
I could be wrong, David, but I interpreted this as referring to frequency
shift keying, which of course contains more total signal energy than on-off
keying. To benefit from the energy advantage, however, the bandwidth of
the receiver must be sufficient to integrate both the mark and the space
frequencies. It is debatable whether this will improve SNR, as the wider
receiver bin width generates a noise penalty.
--------------------------------
H. Paul Shuch, Ph.D., CFII, FBIS, FRCA
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
n6tx_at_setileague.org www.setileague.org
Project Argus station FN11LH
"We Know We're Not Alone!"
This archive was generated by hypermail 2.1.2 : Sun Jan 19 2003 - 06:36:32 PST