Hi,
Wouldn’t it be a possible solution if the SW could set the necessary settings to the SA, then perform a 200 kHz sweep, and then just set the new settings for the next 200kHz sweep – but still keeping the display window results for the previous 200kHz sweeps? When the frequency gets beyond 16Mhz just one setting would need to be sent to the device for the rest of the sweep.
This way the hard limitation of the device would be transparent to the user.