Topband: Signals in noise

[Larry Emery]

I would believe that.  That explains why I prefer listening to very
weak stations with the filters opened to 700-800 Hz many times.

Of course it doesn't help much getting the freq super close when
spotting on packet  <8^))

Larry K1UO

----- Original Message -----
From: "Jerry T Dowell" <jerryandgail at earthlink.net>
To: <TOPBAND at contesting.com>
Sent: Saturday, March 27, 2004 1:09 PM
Subject: Topband: Signals in noise


There is an interesting article in Chinese Physics Letters Vol. 21,
No. 4,
p. 757 regarding enhancing detection of single tones by adding noise.
A
phenomenon with which I am sure almost all topbanders are familiar.
The
authors find that detectability can be enhanced by as much as almost 6
dB by
adding white noise. Using the denoiser on the DSP (or using the
narrowest
filter) is not always the best strategy!

You can download a copy of the article free for the next week or so at

www.iop.org    click on "Journals" and register (which is fairly
easy).

Jerry   AI6L

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