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Re: Topband: Signals in noise

To: <>
Subject: Re: Topband: Signals in noise
From: "Larry Emery" <>
Date: Sat, 27 Mar 2004 15:04:03 -0500
List-post: <>
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" <>
To: <>
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.
phenomenon with which I am sure almost all topbanders are familiar.
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
filter) is not always the best strategy!

You can download a copy of the article free for the next week or so at    click on "Journals" and register (which is fairly

Jerry   AI6L

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