That's slow scan TV from the ISS. Doesn't always transmit. For proof, the station passed directly overhead DFW last night (watched it from my window), and not a peep on 145.800. I've been using a program for my Android phone called Robot 36 to decode the signal. All you have to do is hold your phone up to the scanner speaker when you hear the signal, set it for sharpest image, fastest update rate, and PD 120 mode, and viola'....