Decoding 137MHz signals from passing satellites to get images with a $10 SDR

3 hours ago

Weather satellites use APT signals for automated picture transmission since the 1960s, which can be received with affordable RTL-SDR dongles and specialized antennas like QFH for under $50.
Essential software includes GQRX for signal reception with corrected frequency settings and WxtoImg for constructing images, utilizing a virtual audio setup on Mac via Soundflower for real-time processing.
Key hardware involves a QFH antenna for better reception, built from PVC pipes and copper wire, and calibration using a local NOAA weather radio station to adjust frequency offsets.

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