If the ARISSat-1 satellite goes into eclipse, and the battery has failed, the software doesn't get to decide when to shut down. The lights are out with no power.
On Aug 27, 2011, at 3:00 PM, [email protected] wrote: > Send AMSAT-BB mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > http://amsat.org/mailman/listinfo/amsat-bb > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of AMSAT-BB digest..." > > > Today's Topics: > > 1. CM86/CM96 rare grid activation this Saturday August 27. > (John Papay) > 2. ARISSat-1 (Carl Rimmer) > 3. Re: ARISSAT-1 (Clint Bradford) > 4. Re: some exceedingly clever technology (i8cvs) > 5. Re: ARISSat-1 (Pete MI0VAX) > 6. Southwest Texas Grids - August 22/23 SUCCESS! > (Clayton Coleman W5PFG) > 7. Arissat-1 transponder LAST NIGHT OVER UK (paul robinson) > 8. Re: ARISSat-1 (Ransom, Kenneth G. (JSC-OC)[BARRIOS TECHNOLOGY]) > 9. Re: ARISSat-1 (James McBride) > 10. Re: ARISSat-1 (Douglas Quagliana) > 11. SO67 - HO68 Status (Ted) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Fri, 26 Aug 2011 15:45:22 -0400 > From: John Papay <[email protected]> > To: [email protected] > Subject: [amsat-bb] CM86/CM96 rare grid activation this Saturday > August 27. > Message-ID: <[email protected]> > Content-Type: text/plain; charset="us-ascii"; format=flowed > > Hello. K G 6 N U B/p received a positive response from his CM86 / > CM96 grid activations last week from Santa Cruz California. To fill > unmet demands for these grids, especially CM86, he will be traveling > to the CM86/CM96 grid boundary this Saturday August 27th. For > those needing cards, a SASE sent the FCC ULS listed address is > appreciated, but not required. Expect a 3-12 month turnaround. > He always operates with 5W or less into a hand held yagi connected > to a full duplex radio. The operation plan is as follows: > > QTH: -122.0/37.0 > ------------------------------------------------------ > Object AOS (utc) LOS grid(s) > ------------------------------------------------------ > SO-50 19:47 19:59 CM86/CM96 > AO-27 20:04 20:15 CM86/CM96 > AO-27 21:41 21:56 CM86 > AO-51 22:10 22:22 CM86/CM96 > AO-27 23:26 23:33 CM86 > AO-51 23:47 00:02 CM86 > AO-51 01:30 01:39 CM86(maybe) > > > 73, > John K8YSE > > > > ------------------------------ > > Message: 2 > Date: Fri, 26 Aug 2011 22:59:54 -0400 > From: Carl Rimmer <[email protected]> > To: [email protected] > Subject: [amsat-bb] ARISSat-1 > Message-ID: <[email protected]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > I was having a really good pass gpong from my NW-SE and I had copied 6 > frames of Telemetry and 5 frames of KURSK data when the bird just went > silent. It never came back during this pass. It was the 08-27-2011 > 0241 UTC pass over Lake Erie. I am curious if anyone has heard it since > than. That is probably the best I have copied it since day one. The > frames where forwarded. The MET was 55' 33". Bat Voltage = 35.668; Bat > Current = -16 ma. I've never heard it just go silent like that and not > come back up. > > Carl W8KRF > > > ------------------------------ > > Message: 3 > Date: Fri, 26 Aug 2011 20:38:56 -0700 > From: Clint Bradford <[email protected]> > To: AMSAT BB <[email protected]> > Subject: [amsat-bb] Re: ARISSAT-1 > Message-ID: <[email protected]> > Content-Type: text/plain; CHARSET=US-ASCII > >>> ... I was having a really good pass ... went silent ... 08-27-2011 0241 UTC >>> pass over Lake Erie ... > > All the more reason for EVERYONE to report their work on the OSCAR Status > site at ... > > http://oscar.dcarr.org/ > > Our reports help not only "meager" fellow hams, but also the control > operators of the various satellites > up there! > > Clint, K6LCS > http://tinyurl.com/ARISSAT1-STATUS > > > ------------------------------ > > Message: 4 > Date: Sat, 27 Aug 2011 09:13:29 +0200 > From: "i8cvs" <[email protected]> > To: <[email protected]>, "R Oler" <[email protected]> > Cc: Amsat BB <[email protected]> > Subject: [amsat-bb] Re: some exceedingly clever technology > Message-ID: <000001cc6489$5f28ac60$0401a8c0@b3o7f1> > Content-Type: text/plain; charset="iso-8859-1" > > Hi Phil, KA9Q > > What you describes using both magnetorquers ,momentum wheels > and CCD video cameras for the attitude control system is what > was made on AO40 but it was a big satellite and not a microsatellite. > > 73" de > > i8CVS Domenico > > ----- Original Message ----- > From: "Phil Karn" <[email protected]> > To: "R Oler" <[email protected]> > Cc: "Amsat BB" <[email protected]> > Sent: Friday, August 26, 2011 6:54 PM > Subject: [amsat-bb] Re: some exceedingly clever technology > > >> On 8/24/11 8:11 PM, R Oler wrote: >>> >>> http://onorbit.com/node/3709 >> >> Thrusters are necessary for orbit control, but for attitude control >> (which I think we really need) you'd *really* prefer something that >> doesn't consume a fuel. >> >> These attitude control systems come in basically two types: >> magnetorquers and reaction wheels. Magnetorquers exchange angular >> momentum with the earth by acting on its magnetic field, but they tend >> to be slow, imprecise and require complex control and sensing systems >> including a magnetometer far enough from the spacecraft to get away from >> its own magnetic fields. >> >> Reaction wheels come in two kinds: momentum wheels and control moment >> gyros. Momentum wheels change speed while control moment gyros don't. >> The latter seem much more common in spacecraft but I'd investigate both. >> They're good for quick, accurate pointing like you'd need to keep an >> antenna pointed down or a solar panel pointed at the sun. >> >> Having both a magnetorquer and a set of wheels can be advantageous as >> the magnetorquer can be used occasionally to dump accumulated angular >> momentum from the wheels should it build up from small external torques. >> >> Controlling attitude also means measuring it, and for this I keep >> thinking about small, cheap CCD video cameras. If we could build good >> enough sunshades we could snap pictures of star fields and look them up >> in a database. If you can match multiple stars in an image, then a >> single image could fix the attitude of the spacecraft. But I'd want to >> put a camera on each surface if possible. They could also sense the sun >> and the earth, though that's not as simple as it might seem. The sun >> usually overloads a CCD and produces streaks while the earth is very >> large in LEO. It might be possible to recognize the limb of the earth >> and get better precision that way. A lot would depend on the software >> processing these images, and it would be a challenge to write. >> >> -Phil, KA9Q >> >> _______________________________________________ >> 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 > > > > ------------------------------ > > Message: 5 > Date: Sat, 27 Aug 2011 12:33:34 +0100 > From: Pete MI0VAX <[email protected]> > To: [email protected] > Cc: [email protected] > Subject: [amsat-bb] Re: ARISSat-1 > Message-ID: > <canwro_olkvppvxgburtwyy4gvhl8nfybddtjew5-_ygl0vx...@mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > Hi Carl, > > I've seen this recently myself too.. On the occasions when it happened here > over the UK, the bird "should" have been in high power mode, but after > looking at telemetry it appears that it had switched into low power mode > much earlier that than usual, from memory the footprint was only half in > eclipse. Also noticed that before it cuts off that there is usually 10-15 or > so seconds of a silent carrier. On another occasion it cut out halfway > through a SSTV transmission - this I'm almost certain shouldn't have > happened due to the way the firmware was written. > > Perhaps a bad solar panel contributing to low voltage when approaching > eclipse? I had noticed one of the panel temps was over 75c on several > passes. > > It certainly looks like there is some intermittent problems beginning to > raise their head, lets hope it's not a steady decline in the bird's > performance as gathering the SSTV pics, telemetry etc has been a very > enjoyable change to the usual FM/SSB activity. > > 73 de Pete > > Mi0VAX > > > On Sat, Aug 27, 2011 at 3:59 AM, Carl Rimmer <[email protected]> wrote: >> I was having a really good pass gpong from my NW-SE and I had copied 6 >> frames of Telemetry and 5 frames of KURSK data when the bird just went >> silent. It never came back during this pass. It was the 08-27-2011 0241 >> UTC pass over Lake Erie. I am curious if anyone has heard it since than. >> That is probably the best I have copied it since day one. The frames > where >> forwarded. The MET was 55' 33". Bat Voltage = 35.668; Bat Current = -16 >> ma. I've never heard it just go silent like that and not come back up. >> >> Carl W8KRF >> _______________________________________________ >> 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 >> > > > ------------------------------ > > Message: 6 > Date: Sat, 27 Aug 2011 07:50:09 -0500 > From: Clayton Coleman W5PFG <[email protected]> > To: AMSAT <[email protected]> > Subject: [amsat-bb] Southwest Texas Grids - August 22/23 SUCCESS! > Message-ID: > <capovowczfrpc-+em2cj0adf_h-vik8vjspenr5e9_wd44x2...@mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > I want to thank all who supported my efforts to activate DL98/DL99 on the > Texas/Mexico border. I also made quite a few contacts from EL07 in Laredo, > Texas. Despite two border patrol inspection stations and three border > patrol "drive-by's" while I was operating, the boundary operation went > smoothly. APRS coverage was fairly poor for most of the trip unless I was > in between major metropolitan areas in the Interstate 35 corridor. > > My SO-50 operations weren't as smooth as on AO-27 and AO-51 because they > were unplanned and I was working them from whatever place I was on the road > at AOS. Sometimes it was *not* a great location. > > Overall I ended up making 102 contacts from grids EM00, EM01, EM02, EL07, > EL08, EL09, DL98, and DL99. I've already uploaded these contacts to Logbook > of the World. If you would like a paper card, please email me the QSO > details or go the usual direct/SASE route. > > 73, > Clayton > W5PFG > EM21 > > > ------------------------------ > > Message: 7 > Date: Sat, 27 Aug 2011 15:26:30 +0100 (BST) > From: paul robinson <[email protected]> > To: [email protected] > Subject: [amsat-bb] Arissat-1 transponder LAST NIGHT OVER UK > Message-ID: > <[email protected]> > Content-Type: text/plain; charset=iso-8859-1 > > rpt 5/7 sig last night via the transponder called cq a few times heard a EA > station that was weak but didnt manage to work him.Its not easy to work but > possable. 2E1EUB > ? > > ------------------------------ > > Message: 8 > Date: Sat, 27 Aug 2011 09:31:39 -0500 > From: "Ransom, Kenneth G. (JSC-OC)[BARRIOS TECHNOLOGY]" > <[email protected]> > To: Carl Rimmer <[email protected]>, "[email protected]" > <[email protected]> > Subject: [amsat-bb] Re: ARISSat-1 > Message-ID: > <cbb2346c58d9b14983e5aefe4b3458868efaa99...@ndjsscc01.ndc.nasa.gov> > Content-Type: text/plain; charset="us-ascii" > > Looks like the satellite entered eclipse about that time. The solar panels > are all that is powering the satellite now. > > Kenneth - N5VHO > > ________________________________________ > From: [email protected] [[email protected]] On Behalf Of > Carl Rimmer [[email protected]] > Sent: Friday, August 26, 2011 9:59 PM > To: [email protected] > Subject: [amsat-bb] ARISSat-1 > > I was having a really good pass gpong from my NW-SE and I had copied 6 > frames of Telemetry and 5 frames of KURSK data when the bird just went > silent. It never came back during this pass. It was the 08-27-2011 > 0241 UTC pass over Lake Erie. I am curious if anyone has heard it since > than. That is probably the best I have copied it since day one. The > frames where forwarded. The MET was 55' 33". Bat Voltage = 35.668; Bat > Current = -16 ma. I've never heard it just go silent like that and not > come back up. > > Carl W8KRF > _______________________________________________ > 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 > > > ------------------------------ > > Message: 9 > Date: Sat, 27 Aug 2011 22:07:31 +0800 > From: James McBride <[email protected]> > To: [email protected] > Subject: [amsat-bb] Re: ARISSat-1 > Message-ID: <[email protected]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Hi all, > I found this morning in VK6 (approx. 03:45 UTC) the MET counter said > 21min 45 sec, which is approx. the time ARISSat-1 would have come back > into Sunlight. Strange thing is it was on High Power - got plenty of > telemetry frames but was discharging at a great rate of knots.. Looking > at the data it would seem there was more discharging than charging going > on over it's first 21 minutes. 1 panel said 45v, the others were around > 15v so the part that was facing direct sunlight was good. I will get > another chance perhaps in a few hours to see if it's still alive when > not in sunlight and will try to grab some more telemetry. > > I have a jpg screenshot of telemetry with the position info from earlier > if anyone would like it. > > 73 > James VK6FJA > > > On 27/08/2011 7:33 PM, Pete MI0VAX wrote: >> Hi Carl, >> >> I've seen this recently myself too.. On the occasions when it happened here >> over the UK, the bird "should" have been in high power mode, but after >> looking at telemetry it appears that it had switched into low power mode >> much earlier that than usual, from memory the footprint was only half in >> eclipse. Also noticed that before it cuts off that there is usually 10-15 or >> so seconds of a silent carrier. On another occasion it cut out halfway >> through a SSTV transmission - this I'm almost certain shouldn't have >> happened due to the way the firmware was written. >> >> Perhaps a bad solar panel contributing to low voltage when approaching >> eclipse? I had noticed one of the panel temps was over 75c on several >> passes. >> >> It certainly looks like there is some intermittent problems beginning to >> raise their head, lets hope it's not a steady decline in the bird's >> performance as gathering the SSTV pics, telemetry etc has been a very >> enjoyable change to the usual FM/SSB activity. >> >> 73 de Pete >> >> Mi0VAX >> >> >> On Sat, Aug 27, 2011 at 3:59 AM, Carl Rimmer<[email protected]> wrote: >>> I was having a really good pass gpong from my NW-SE and I had copied 6 >>> frames of Telemetry and 5 frames of KURSK data when the bird just went >>> silent. It never came back during this pass. It was the 08-27-2011 0241 >>> UTC pass over Lake Erie. I am curious if anyone has heard it since than. >>> That is probably the best I have copied it since day one. The frames >> where >>> forwarded. The MET was 55' 33". Bat Voltage = 35.668; Bat Current = -16 >>> ma. I've never heard it just go silent like that and not come back up. >>> >>> Carl W8KRF >>> _______________________________________________ >>> 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 >>> >> _______________________________________________ >> 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 > > > ------------------------------ > > Message: 10 > Date: Sat, 27 Aug 2011 13:22:58 -0400 (EDT) > From: Douglas Quagliana <[email protected]> > To: [email protected], [email protected] > Subject: [amsat-bb] Re: ARISSat-1 > Message-ID: <[email protected]> > Content-Type: text/plain; charset="us-ascii" > > > > > Telemetry came into the Internet telemetry server up until 02:43:37 UTC Aug > 27. Then there's no > further telemetry until 3:35:46 UTC. > > If you are receiving telemetry, please turn on the forwarding to the Internet > telemetry > server, and also please email in your .CSV files to telemetry at arissattlm > dot org. > > Douglas KA2UPW/5 > > > > > > > -----Original Message----- > From: Carl Rimmer <[email protected]> > To: amsat-bb <[email protected]> > Sent: Fri, Aug 26, 2011 10:09 pm > Subject: [amsat-bb] ARISSat-1 > > > I was having a really good pass gpong from my NW-SE and I had copied 6 > frames of Telemetry and 5 frames of KURSK data when the bird just went > silent. It never came back during this pass. It was the 08-27-2011 > 0241 UTC pass over Lake Erie. I am curious if anyone has heard it since > than. That is probably the best I have copied it since day one. The > frames where forwarded. The MET was 55' 33". Bat Voltage = 35.668; Bat > Current = -16 ma. I've never heard it just go silent like that and not > come back up. > > Carl W8KRF > > > > > > > ------------------------------ > > Message: 11 > Date: Sat, 27 Aug 2011 11:54:42 -0700 > From: "Ted" <[email protected]> > To: <[email protected]> > Subject: [amsat-bb] SO67 - HO68 Status > Message-ID: <F78C6EA03BAC437DB19630942D74BBF5@HamComputer> > Content-Type: text/plain; charset="us-ascii" > > The SA AMSAT site states: > "SO67 suffered another anomaly which means that all amateur activity has > been suspended." > I think the translation is RIP SO67 > As for HO68, the CAMSAT web page is no longer there > I take that as RIP HO68 > > TK > K7TRK > > > > > ------------------------------ > > _______________________________________________ > Sent via [email protected]. Opinions expressed are those of the author. > Not an AMSAT member? Join now to support the amateur satellite program! > http://amsat.org/mailman/listinfo/amsat-bb > > > End of AMSAT-BB Digest, Vol 6, Issue 492 > **************************************** Lou McFadin W5DID ARISS US Hardware manager _______________________________________________ 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
