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## Re: [Amps] IMD

 To: "amps@contesting.com" Re: [Amps] IMD Dan Mills Wed, 11 Jan 2012 01:40:31 +0000 mailto:amps@contesting.com>
 ```On Tue, 2012-01-10 at 13:39 -0500, Bill Fuqua wrote: > Wait, > Something is not right here. > How did you get the baseband envelope? I generated my square wave approximation in the obvious fashion (sum of series of sines), then stuffed it through a IIR hilbert transform (and appropriate delay) to get the I,Q pair, standard phasing method logic. Baseband envelope is then simply sqrt (I^2 + Q^2), being the magnitude of the resulting phasor. Basically I wrote a very simple minded SSB generator in software, had it write a half dozen data files, then loaded them into gnuplot to produce the graphs. You can get something very similar with the following mess: gnuplot> plot sin(x + pi/2.0) + 1.0/3* sin((3*x)+pi/2.0) + 1.0/5 * sin ((5*x)+pi/2.0) + 1.0/7 * sin ((7*x)+pi/2.0), sqrt((sin(x + pi/2.0) + 1.0/3* sin((3*x)+pi/2.0) + 1.0/5 * sin ((5*x)+pi/2.0) + 1.0/7 * sin ((7*x)+pi/2.0))**2 + (sin(x) + 1.0/3* sin((3*x)) + 1.0/5 * sin ((5*x)) + 1.0/7 * sin ((7*x)))**2),sin(x) + 1.0/3* sin((3*x)) + 1.0/5 * sin ((5*x)) + 1.0/7 * sin ((7*x)) I still say doing it in C was easier, mathcad, matlab, or octave would also be entirely possible. Now, what have I misunderstood about SSB? This has a direct impact on an exciter I am developing, so knowing if and where I am losing it would be a very good thing. Regards, Dan. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps ```
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