Oh -- that explains a lot --
Particularly, why, during testing yesterday of SMT Hell bandwidths and
pixel durations, the optimum settings for decoding with Argo seemed to
come out with ratios that did not appear to be exactly related to
specified dot length.
Shouldn't the labelled dot length be in ratios of 2 then, rather than 3
?
Andy G4JNT
-----Original Message-----
From: Alberto di Bene [mailto:[email protected]]
Sent: 2001-02-26 12:37
To: [email protected]
Subject: LF: Re: 10 sec. dots
At 10s dot the FFT bin size is exactly 1/4 of the size at 3s
dot. So, if the noise power
is evenly distributed, and the wanted signal falls exactly in
a single bin, there is a 6 dB
S/N improvement from passing from one mode to the other. How
those 6 dB translate
into a visual gain is difficult to say, given also the higly
non-linear mapping between
magnitudes and color saturation in Argo.
73 Alberto I2PHD
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