N4CSV wrote:
Hello all,
I am in the process of building my new SDR1000 boards into a full
blown transceiver and wanted to offer these remarks. One of the most
remarkable things about the SDR1000 is how the composite I believe
this would produce a very loud and clean signal, probably better than
anything out there at the moment. Could this be accomplished in
software? I don't know. Is it possible to produce a software clipper
that emulates an RF SSB clipper? Again, that I don't know. I believe a
good starting point to all this would be to adjust the ALC time
constants as I have outlined above. Then perhaps more could
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wscompand's running in the compressor mode is exactly that, a soft
limiter. It squares up the envelope considerably if you push
the control up to "10".
Here is what I am going to do, I am going to figure out the best
regression line at the place of maximum slope on this compression
curve. That slope will tell you how much gain is being applied at that
agnitude. If it is 10 dB, I am going to call it "10 dB of
compression". This will take a few minutes to figure out and when I
have a few minutes, I will do it. Don't let us forget. Using Frank's
description of the function, almost any of you who have had a little
calculus and remember that d(exp(f(x))/dx is exp(f(x))* f'(x) can do
this. ;-)
Bob
N4HY
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73,
Phil
N4CSV/NNN0RBC
