> Thanks, > > maybe I didn't make myself clear: > > LEO (low earth orbit) from 400 to 2000km or something like that > HEO (high earth orbit) >20000km > > Going from 310 to 700km in a year is not doing us anything. We need a > highly elliptical orbit (Apogee ~60000km, Perigee 900km) similar to AO-40 > to allow for cross continental communication. > > Stefan VE4NSA >
On January 23 I was on UL mode with a DL and an Italian station i was just testing my new L Band amp and it was my 802 QSO on AO-40 my last one snif snif. The rest is old story who can be shared only with those guys who enjoy one of the best AMSAT satellite. For those who just start to flirt with satellite here is how the story end On 25 January 2004, telemetry from the main battery was observed to go to an extremely low voltage by Stacey Mills (amateur radio call sign W4SM), a member of the Command Team. This caused the onboard Internal Housekeeping Unit (IHU) computer to cut power to the transponder payloads. Just prior to the loss of control of the satellite, the auxiliary battery came online in parallel with the main battery. When the main battery failed, it effectively short-circuited the auxiliary battery, killing the spacecraft. Many attempts were made to disconnect the main battery, but insufficient voltage was available to drive the relays. One day an open-circuit failure may occur in the main battery, in which case the spacecraft may come to life again. Though the command team believe that the main battery failure was probably a consequence of damage done during the event, and it is likely that similar damage was done to the auxiliary battery, making an eventual recovery of AO-40 unlikely. What the story does not tell it is possible that a manual command was the culprit here but all the folks who work on the AO-40 project are also human and perfectible as you and me. It is a refreshing breeze to start to hear HEO again so sorry for those who pass by to the eternal DX cluster. "-" Luc Leblanc VE2DWE Quebec provincial Hamfest HTTP://www.hamfest.qc.ca DSTAR urcall VE2DWE WAC BASIC CW PHONE SATELLITE _______________________________________________ Sent via [email protected]. 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
