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The RSP1 was measuring with a 500Hz FFT bin size where the tinySA measured with a 30kHz resolution filter bandwidth.

The snow has fallen and is sticking around... so I'm playing catch up on the electronics and RF engineering projects from last winter post the outdoor projects last year that scope creeped into this year.?

Looks like this TinySA project has really developed into a broader range of options and is really neat reading through from a higher level detail. Looks like the Tapr-VNA has slowed down in contrast.? ?I'm starting to re-read and study more thoroughly the posts for this winter and to do some hands on work to actually make one of these TinySA's.? I'm also thinking about investing in a SB G6 so I have a 384kHz USB sound card also for wider band ultrasound recording and hoping to find a used one for a better price.? Wondering what the effect of a 384kHz sound card will be on the system also.?

For starters, I have two questions:

1. Have you made changes that reduced the dynamic range using the Si4432 vs the Si5351?? Seems where I left off following in detail last winter... you had a lower noise floor reported.? I may be wrong and need to read through again.? If this is a correct observation, was this due to settings like decimation or something in the design??

2. Reading regarding phase noise, is the 30kHz bandwidth the only issue and what limits this?? Would something like a Cross Correlation significantly improve performance (double up the spectrum analyzer modules like TSP#162 notes about 34min in and better @ 36min in)??

I'm going to have to study some more and see what effect using a GPSDO would be as I think was addressed already and maybe would be better for the calibration and I'm guessing thermal noise characterization to set values in the software.?

Wondering also what improvements will be like enclosing the modules better as I have the mini-lathe vertical slide so I can machine, like a horizontal mill, enclosures eventually.?

Thanks for sharing, excellent info!