Hello Jean-Pierre,
Thanks for running the grabber (which I frequently visited in the past
weeks).
I don't think that the dynamic range of the spectrum display in SpecLab
has changed that much,
but there may be some points to consider:
- use one of the FFT windows with a large stopband attenuation.
There is a nice comparison of different FFT windows here:
http://en.wikipedia.org/wiki/Window_function
( -> the "Hann" window is ok, but avoid the "Rectangular" window).
- reduce the soundcard volume (if you use a soundcard for input) so the
maximum peak level stays at least 6 dB below the clipping level (use one
of the "monitor scopes" to see this).
- the noiseblanker may help to reduce the effect of "dog-boning" if the
strong signal uses hard on/off-keying (quite likely for class-C amplifiers).
Besides that, V2.71 "beta 3" is available, but I wouldn't recommend it
for unattended operation because it is not thoroughly tested (yet).
Murphy will make sure it will crash only after something interesting
appeared on the screen ;-)
All the best for 2008 to everyone,
Cheers,
Wolf .
Jean-Pierre Méré schrieb:
Hello all on LF ,
For better managing the strong signals , I passed the grabber to the
version 2.7b20 of SpectrunLab ( thank you Wolf for this splendid tool )
I hope for that I did not make errors, that seems to function correctly
until there! one will be fixed tomorrow !
grabber at : http://jpmere.online.fr/Grabber/Grabber.htm
73 Jean-Pierre f1afj JN06ht
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