Reply To: SM200B Frequency Trigger

Disabling IF filter: If the only tradeoffs were gnarly rolloff and uncalibrated amplitude, sure, but antialiasing is a considerable foot-gun, especially for swept signals like mine. I would probably not opt to disable IF filters for my application. After all, I was able to obtain a stable trigger with the filter in place, it was just in an unexpected location. It might be useful for other purposes… but it’s definitely a foot-gun and not motivated by this particular application so I wouldn’t mind if you kept the option restricted to the API layer.

As for independently controlling FMT FFT size, I think that’s worth the effort to expose. In a perfect world, it would do its own FFTs for the purposes of the preview, but since FMT configuration already happens in a separate dialog, you could probably get away with hijacking the RBW setting while the dialog was open if that’s significantly easier. In any case, a slider akin to a multimeter “resolution / speed” tradeoff slider (but with frequency resolution / time resolution) would be an elegant way to expose this setting and intuitively communicate both the “50% overlap” architecture from the manual and the 512-16384/power-of-2 nuance that you’ve mentioned in this thread. Of course, once that tradeoff is communicated you’ll have people like me asking for time resolutions finer than 512/2 but every step forward is worthwhile even if they can’t all be made at once.

Cheers,
J

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