Fwd: A SpurFinder suggestion
Bob Wood
From: Steve Schupbach <steve.s...@senariotek.com>
Date: Mon, Jan 18, 2010 at 11:23 AM
Subject: A SpurFinder suggestion
To: raw...@rawood.com
R. A. Wood Associates,
I’m a really big fan of SpurFinder. It really does a nice job! I think I’ve bought three copies over the years.
I do have a suggestion however:
It would really nice if there was an easy way to accurately compute the input and output frequencies at which a specific spur crosses the desired output frequency (a crossing spur). I imagine something as luxurious as simply clicking the specific spur in the “Spur Order Key” and having the “Input Frequency” slider and readout move to that frequency and seeing the “Output Frequency” readout show the corresponding output frequency. This may sound simple but it’s very valuable when you’re trying to measure high-order spurs at low levels. I have spent hours doing this during synthesizer design. For low-level spurs you have to use narrow resolution bandwidths on the spectrum analyzer to get the noise floor down to a useable level. This slows the sweep time so you have to use a narrow span. With high-order spurs, if you don’t know the cross-over frequency accurately the spur can just zoom through your narrow span as you try to tune it and you’ll never see it. Additional resolution of the frequencies would probably be necessary for this to really work.
Thanks for your consideration.
Steve Schupbach
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