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I think the basic idea (for AM) is that you let the SINAD program generate the 1kHz modulation tone and feed this (from the soundcard) to the signal generator as external AM modulation.

That way the modulation tone should always be on the same frequency as the notch filter in the DSP in the computer.

[QUOTE="G0HZU, post: 416642, member: 19109"] I think the basic idea (for AM) is that you let the SINAD program generate the 1kHz modulation tone and feed this (from the soundcard) to the signal generator as external AM modulation. That way the modulation tone should always be on the same frequency as the notch filter in the DSP in the computer. [/QUOTE]

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