Tough decisions. ARISSat-1 was taken to the ISS on a Progress vessel with 50-ohm terminations (dummy loads) installed on both antenna connectors. At the ISS, the terminations were to be removed and the 2M (long transmit) antenna and 70 cm (short receive) antenna installed. The ARISSat-1 tests used a coax cable to an ISS external antenna connected to the 2M connector on the top of the satellite.
The video of the spacewalk clearly showed the 2M antenna installed. >From a very brief head-on video shot, it appeared that the 70 cm antenna >wasn't installed. I don't remember the size of the terminator, so I can't say >if the 70 cm terminator was present, or if the antenna had been installed but >broken, or if the connector wasn't terminated. My *guess* is that the >terminator is still installed. If launched as is, I think the downlink on 2M should work with the telemetry (BPSK-1000, CW, FM voice recordings, and SSTV). What won't work is the U/v transponder. Watching the video made it very clear how hard it is to handle the satellite "carefully". So the risk (specifically mentioned by one of the cosmonauts) is that the solar panels won't survive taking the satellite back into the ISS to install the antenna and launch another day. One other potential scenario would be to remove the 70 cm terminator (if it is attached to the connector) and launching today. There is a *slim* chance that high-powered ground stations might be able to be heard by the U/v transponder. Tough decisions. 73, Steve N9IP -- Steve Belter -----Original Message----- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of B J Sent: Wednesday, August 03, 2011 11:36 AM To: amsat-bb@amsat.org Subject: [amsat-bb] ARISSat-1 Deployment Scrubbed Apparently, an antenna went missing so it's not known if ARISSat will be transmitting properly. Deployment might occur later during this EVA pending a decision from mission control. 73s Bernhard VA6BMJ @ DO33FL _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
