Your logic seems sound to me.
2 things that I think could be happening.
1) Is the recording clean? Can you verify there wasn’t some sort of issue with the recording. The main issues being SSD write speeds not keeping up with the data rate, or UDP data loss. Are you using the I/Q recorder in Spike? It should indicate either of these issues. It will appear below the “Rate” label in the I/Q recorder if it occurs. It’s a hidden label by default.
2) Drop outs in the VSG60 output. Are you running the SM200C at the same time as the VSG60? If yes, that could certainly contribute. If you’ve been running other files at 50MS/s without issue, then I would lean towards #1
Is the recording only 2 seconds long? 🙂
If it’s a long file, are you using the “streaming” mode in the VSG60 software? If yes, that means it’s hitting the file all the time. Presumably you aren’t also doing other high speed file I/O while playing back on the VSG?
