I'm a new ham. The past few days, I've had a few nearby passes of the International Space Station. As it was going overhead, I managed to record what I believe to be 1200 baud AFSK transmissions from it (AX.25) - from it's 145.825MHz Packet Radio downlink. I have an audio file of one. I am trying to figure out how to decode it and haven't had any luck. I've tried QTMM from SourceForge (playing the recording into my computer microphone) - but got no decode.
I have an audio file which has three distinct burst of what appear to be data (with very little noise during these bursts). Both nights, these burst only occurred while the station was nearest to me. Thus, I'm positive I have good audio - just can't figure out how to demodulate!