apt137 Decode APT signals from NOAA weather satellites. Links http://www.ncdc.noaa.gov/oa/pod-guide/ncdc/docs/klm/html/c4/sec4-2.htm http://noaasis.noaa.gov/NOAASIS/pubs/Users_Guide-Building_Receive_Stations_March_2009.pdf https://en.wikipedia.org/wiki/Automatic_Picture_Transmission