PhosphorSSTV

PhosphorSSTV decodes Slow Scan Television (SSTV) signals in real time using your iPhone's microphone. SSTV has been the amateur radio image transmission mode since the 1960s. From cold-war era picture transmissions to International Space Station passes, SSTV encodes images as audio tones between 1200–2300Hz. Each scanline is a sweep through frequency space, painting pictures one line at a time across the HF bands. Hold your phone near a shortwave radio tuned to an SSTV signal — or play a recor