dna@dsd.UUCP (05/23/84)
Posted: Tue May 22, 1984 7:29 AM PDT Msg: PGIE-1797-6899 From: MSWEETING To: AMSAT Subj: Oscar-11 status During the morning passes here at Surrey, the first successful attempt at commanding Oscar-11 has been made, following the rise in temperatures on board. The three commands to switch the beacon into audio feed-through mode were accepted within 2 seconds of each other and the uplink at 438MHz was inspected on the 145MHz downlink. Digital data transmitted through this path was successfully decoded and compared back in the groundstation, indicating that the receivers are functioning, but the command reliability is still poor, although good enough to switch back to telemetry using the feedback from the received audio. Further tests on the decoders on the spacecraft will be done when possible in the next few days. Further audio tests are also required. The rising temperature, and effect on command reliability, will determine whether we can boot the main computer and perform several other checks in the next few days. Roger G8NEF Posted: Tue May 22, 1984 7:48 AM PDT Msg: TGIE-1797-7123 From: MSWEETING To: AMSAT Subj: Uo11 status (funny noises) Sorry, folks! Due to the loss of our IPSS link for nearly 36 hours from Sunday through yesterday, (due initially to a power cut), we were unable to let you all know that we have succeeded in putting UoSAT-2 into a digital feed-through mode to investigate the command unreliability. The audio feed-through (described in the preceeding message which we have just sent) showed that the receiver on 438MHz is working adequately, if not well, and that further tests will have to be done in the near future to further characterise the situation. The digital loop-through tests are not producing sensible outputs as yet, indicating possilble problems with the receiver / decoder interface. We are currently analysing the results of this morning's latest efforts and will report when appropriate. Roger G8NEF