Re: filter measurements with tinysa ultra
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Thanks for all the replies and guidance.
Agreed - I think Erik has covered noise pretty well and I'll be sure to follow his video and warnings (especially total power). This seems like the best approach using the Ultra.
Thanks for the note about a slow sweep and max hold. I hadn't thought of that.
I haven't gotten around to getting a nanoVNA yet. Maybe?it's time! It's definitely on my wish list.
Dave
On Mon, Mar 6, 2023 at 11:37?AM Roger Hartel < naples08@...> wrote: Erik published an article on the cautions that must be observed when using a noise source. The total power the SA can see is the result of all frequencies the noise source produces, not just the power at the frequency of interest. He published it within the last two weeks I think, but I didn¡¯t keep it. You can also use a well calibrated cheap SDR and computer for the same task. ? Sent from for Windows ? ? Can the tinysa ultra be used with a tracking generator or in some other swept mode? I see the video for the tinysa. Also I see the ultra has an "LO" checkbox. Would one use that LO out to drive a mixer or does the ultra accept an external LO? I'm interested in sweeping a filter. I've seen the noise-generator based method so perhaps that's the best approach.
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Dave Koberstein keep in touch:
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