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[AMPS] True Or Not True #2

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Subject: [AMPS] True Or Not True #2
From: (Tom Rauch)
Date: Fri, 7 Sep 2001 20:11:16 -0400

> Sure - in the absence of QRM, it's a workable CW signal. 
> You can easily set up a simulation with a signal generator and an RMS-
> reading AC voltmeter. 

Zero dB S/N is a very workable CW signal for good weak signal 
CW ops. Many people can even dig below zero dB S/N if the noise 
is "rough" noise.

The reason is noise power is directly related to filter bandwidth, and 
CW is a very narrow mode. The brain, if trained properly, makes a 
good CW filter. The brain can discriminate against off-frequency 
noise as long as it has some type of frequency difference. 

If you restrict noise and signal to a very narrow BW, it gets tough 
to "filter" in your head because it all sounds the same. 
73, Tom W8JI 

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