sync is at 1200hz and highest freq is about 2800hz
you can filter out the 0-1000hz and 2900hz and up.
tracking the iss this weekend with my aprs radio i see the bandwidth is about the same from 2m packet as sstv
as viewed on the sstv waterfall display.
73 Brad Ko6kL
looks like iss is still sending today.
I wonder what frequency the iss radio is receiving in between sending pics.... Hmmm