Hi Catshot,
The SA44B is compatible with HDSDR. We provide the files and information necessary for setup on the SA44 downloads page. HDSDR can record the full bandwidth of the device continuously (~250kHz bandwidth) and can be played back through the HDSDR software.
Our software (Spike) can record sweeps indefinitely to a file which can be later brought back into the Spike software.
If you have programming experience, our spectrum analyzers all have a C interface and could easily interface a number of SDR programs with a bit of work. This also include professional environments such as Labview, Matlab, GNU radio, etc.
The SA44B is only compatible with our tracking generators. With the SA44/TG44 pair, you can sweep filters across the full frequency range.
Let me know if you have follow up questions.
Regards,
A.J.