UO-11 also wakes up from its nap…
Another old time satellite might be waking up from its sleep as it comes out of a period of eclipses. Joanne Maenpaa mentioned that UO-11’s telemetry beacon had been heard on 145.825, so I decided to try to give it a listen on its pass to the east. Despite the fact that it was fairly low, I heard the 1200 baud AFSK telemetry quite clearly. I don’t have the ability to decode it (couldn’t find any Mac programs that would), but I recorded a couple of minutes of it using Audacity on my mac anyway. Because someone might be able to decode it from this data, here’s the compressed .wav file:
Here’s a screen dump of Audacity, showing the 1200 and 2400 Hz carriers that make up the AFSK signal.
Addendum: Douglas Quagliana, KA2UPW did what I hoped someone would: ran my recording successfully through his own UO-11 decoder. From the email he sent me:
Hi Mark, Thanks for posting the recording! I downloaded your recording and ran it through my DSP soundcard UO-11 demodulator. Most of the data in your recording looks like this, although other sections are quite noisy. UOSAT-2 0711024074656 000000010001020002030003040004050005060006070007080008090009 100001110000120003130002140005150004160007170006180009190008 20000221000322000023000124000625000726000427000528000A29000B 30000331000232000133000034000735000636000537000438000B39000A 40000441000542000643000744000045000146000247000348000C49000D 50000551000452000753000654000155000056000357000258000D59000C 60800E615FC1620004633305644402651E0C662AC467000168000E69000F All of the columns of zeros are telemetry channels that have failed. This agrees with what Clive has previously reported. Earlier Clive reported: >The current status of the satellite, is that all the analogue >telemetry channels, 0 to 59 are zero, ie they have failed. >The status channels 60 to 67 are still working. The real >time clock is showing a large accumulated error [...] Last month the clock was about 74 days slow, but it is now about 81 days off. In the past UO-11 also used to send stored ASCII bulletins as well, but I think that capability of the satellite ended when the spacecraft computer turned off. Anyone know for sure?
Thanks alot Douglas for the decode.