iPhone app calculates Gamma / X-Ray Photon Attenuation
The International Space Station is sending SSTV (Slow Scan TV) images on 145.8 MHz today through Friday. Here are two images I just copied from the 1938 UTC (2:48 PM EST) pass.
They were transmitted in PD120 mode, and copied using MultiMode Cocoa software (which I happened to write), on a netSDR receiver connected to a discone antenna (which is many years old, and missing several elements).
SSTV is a method of transmitting a picture using audio tones. It takes about two minutes to send an image. Hence the Slow part of Slow Scan TV.
What does SSTV sound like? Here’s a recording of the audio that produced the second image: http://radiohobbyist.org/blog/mypics/iss_sstv.mp3