![]() Since then, new satellites have been launched to both augment or replace those that reached end-of-life. It was the greatest April Fool's non-joke ever. NASA launched the first weather satellite, TIROS (Television Infrared Observation Satellite) into space on April 1st, 1960. You can frequency demodulate the NOAA APT signal, create a WAV file, then use Martin Bernardi's "NOAA APT Decoder" program to give you beautiful images.It will (if I understand it correctly) already control your RTL-SDR and audio card to process the data and give you beautiful, synchronized images. The Wxtoimg program can give you beautiful images pretty-much automagically.There are two straightforward methods if you just want an image. This makes them a perfect target if you want to try out using Gnu Radio Companion (GRC) on something a little different. ![]() These are the Automatic Picture Transmission (APT) signals. Several of those transmit relatively low frequency (137 - 138 MHz) signals that contain low resolution visible and infrared imagery (roughly 4 km) of earth. The US' National Oceanic and Atmospheric Administration (NOAA) operates a fleet of satellites to look at earth's weather. I'm writing this article because I think it's fun. Gary Schafer, Blursday, Pandemic Quarantine Time, Still Probably December 2020
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