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AO-40 in critical condition
From the AMSAT Bulletin board:
Dear All, AO-40 is in a very critical situation at the moment.. Our command team is working hard to get AO-40 back under fully control. Last night (Orbit #1488, 2004-01-27, 00:57, UTC MA 42) the battery voltage suddenly dropped from 26V to 14V. We currently believe, that in some kind of domino effect more battery cells died shortened. There is also a report that the Heat Pipes 4+X+Y temperature suddenly rise from 27°C to 92°C, when a few moments later the voltage went down. This report is not yet confirmed.. Several stations reported, that around this time the S-Band signal dropped rapidly. This would be consistent with the low bus voltage, preventing the S-TX from working properly. At the moment we assume that the IHU is still working. Command stations are trying to send send blind commands to the spacecraft in an attempt to switch over to the auxiliary battery. If that does not help, than the IHU will be reseted and loaded with some software to switch the relays. It may take some time, perhaps until the sun angle is getting better. 73s Peter DB2OS ---- Sent via . Opinions expressed are those of the author. Not an AMSAT member? Join now to support the amateur satellite program! To unsubscribe, send "unsubscribe amsat-bb" to |
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