I was fooling around with the USRP / WBX on the 2 meter band tonight when I suddenly stumbled upon some very strong SSTV transmission. It turned out to be the OZ9STV robot located only a few kilometers from me. That explained why I had more than 40 dB SNR even though I was only using a bad whip antenna indoors.
Neither my Linux computer nor my iMac had any SSTV decoder software installed but a quick search lead me to MultiScan, which is a free and very well functioning SSTV app for the Mac. The receiver I used was the Simple GNU Radio FM Receiver posted few weeks ago.
I have recorded a few transmissions from the robot. This beacon image is transmitted twice every hour if there has been no activity for at least 3 minutes:
Otherwise, the robot transmits the last four images received every 10 minutes:
Next time I will also include the USRP spectrum in the broadcast.