Hand sweeping continuously is not so good, as the software will detect the changing signal as spur and remove it. So you need to pause your sweep regularly to let the software determine the signal is valid.
Also you could turn off the spur detection – of course you then may have issues with spurious and images appearing.
Max hold is available, which would avoid having to capture the trace and post-process it. With spur detect turned on it takes more patience to ‘fill in’ the trace though.
