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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7557SJ63YEGDXYV6XYKYAVRW3I346W63/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "[email protected]", "message_id_hash": "7557SJ63YEGDXYV6XYKYAVRW3I346W63", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/7557SJ63YEGDXYV6XYKYAVRW3I346W63/?format=api", "sender": { "address": "w5did (a) mac.com", "mailman_id": "8518ca733a7241c79decfc3bd8568106", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/8518ca733a7241c79decfc3bd8568106/emails/?format=api" }, "sender_name": "Louis McFadin", "subject": "[amsat-bb] Re: AMSAT-BB Digest, Vol 6, Issue 492", "date": "2011-08-27T21:14:37Z", "parent": null, "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/736S7HKP44UGL5AFYJ25WT5AULKEBTZO/?format=api" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "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.\n\nOn Aug 27, 2011, at 3:00 PM, [email protected] wrote:\n\n> Send AMSAT-BB mailing list submissions to\n> \[email protected]\n> \n> To subscribe or unsubscribe via the World Wide Web, visit\n> \thttp://amsat.org/mailman/listinfo/amsat-bb\n> or, via email, send a message with subject or body 'help' to\n> \[email protected]\n> \n> You can reach the person managing the list at\n> \[email protected]\n> \n> When replying, please edit your Subject line so it is more specific\n> than \"Re: Contents of AMSAT-BB digest...\"\n> \n> \n> Today's Topics:\n> \n> 1. CM86/CM96 rare grid activation this Saturday August 27.\n> (John Papay)\n> 2. ARISSat-1 (Carl Rimmer)\n> 3. Re: ARISSAT-1 (Clint Bradford)\n> 4. Re: some exceedingly clever technology (i8cvs)\n> 5. Re: ARISSat-1 (Pete MI0VAX)\n> 6. Southwest Texas Grids - August 22/23 SUCCESS!\n> (Clayton Coleman W5PFG)\n> 7. Arissat-1 transponder LAST NIGHT OVER UK (paul robinson)\n> 8. Re: ARISSat-1 (Ransom, Kenneth G. (JSC-OC)[BARRIOS TECHNOLOGY])\n> 9. Re: ARISSat-1 (James McBride)\n> 10. Re: ARISSat-1 (Douglas Quagliana)\n> 11. SO67 - HO68 Status (Ted)\n> \n> \n> ----------------------------------------------------------------------\n> \n> Message: 1\n> Date: Fri, 26 Aug 2011 15:45:22 -0400\n> From: John Papay <[email protected]>\n> To: [email protected]\n> Subject: [amsat-bb] CM86/CM96 rare grid activation this Saturday\n> \tAugust 27.\n> Message-ID: <[email protected]>\n> Content-Type: text/plain; charset=\"us-ascii\"; format=flowed\n> \n> Hello. K G 6 N U B/p received a positive response from his CM86 /\n> CM96 grid activations last week from Santa Cruz California. To fill\n> unmet demands for these grids, especially CM86, he will be traveling\n> to the CM86/CM96 grid boundary this Saturday August 27th. For\n> those needing cards, a SASE sent the FCC ULS listed address is\n> appreciated, but not required. Expect a 3-12 month turnaround.\n> He always operates with 5W or less into a hand held yagi connected\n> to a full duplex radio. The operation plan is as follows:\n> \n> QTH: -122.0/37.0\n> ------------------------------------------------------\n> Object AOS (utc) LOS grid(s)\n> ------------------------------------------------------\n> SO-50 19:47 19:59 CM86/CM96\n> AO-27 20:04 20:15 CM86/CM96\n> AO-27 21:41 21:56 CM86\n> AO-51 22:10 22:22 CM86/CM96\n> AO-27 23:26 23:33 CM86\n> AO-51 23:47 00:02 CM86\n> AO-51 01:30 01:39 CM86(maybe)\n> \n> \n> 73,\n> John K8YSE\n> \n> \n> \n> ------------------------------\n> \n> Message: 2\n> Date: Fri, 26 Aug 2011 22:59:54 -0400\n> From: Carl Rimmer <[email protected]>\n> To: [email protected]\n> Subject: [amsat-bb] ARISSat-1\n> Message-ID: <[email protected]>\n> Content-Type: text/plain; charset=ISO-8859-1; format=flowed\n> \n> I was having a really good pass gpong from my NW-SE and I had copied 6 \n> frames of Telemetry and 5 frames of KURSK data when the bird just went \n> silent. It never came back during this pass. It was the 08-27-2011 \n> 0241 UTC pass over Lake Erie. I am curious if anyone has heard it since \n> than. That is probably the best I have copied it since day one. The \n> frames where forwarded. The MET was 55' 33\". Bat Voltage = 35.668; Bat \n> Current = -16 ma. I've never heard it just go silent like that and not \n> come back up.\n> \n> Carl W8KRF\n> \n> \n> ------------------------------\n> \n> Message: 3\n> Date: Fri, 26 Aug 2011 20:38:56 -0700\n> From: Clint Bradford <[email protected]>\n> To: AMSAT BB <[email protected]>\n> Subject: [amsat-bb] Re: ARISSAT-1\n> Message-ID: <[email protected]>\n> Content-Type: text/plain; CHARSET=US-ASCII\n> \n>>> ... I was having a really good pass ... went silent ... 08-27-2011 0241 UTC pass over Lake Erie ...\n> \n> All the more reason for EVERYONE to report their work on the OSCAR Status site at ...\n> \n> http://oscar.dcarr.org/\n> \n> Our reports help not only \"meager\" fellow hams, but also the control operators of the various satellites \n> up there!\n> \n> Clint, K6LCS\n> http://tinyurl.com/ARISSAT1-STATUS\n> \n> \n> ------------------------------\n> \n> Message: 4\n> Date: Sat, 27 Aug 2011 09:13:29 +0200\n> From: \"i8cvs\" <[email protected]>\n> To: <[email protected]>, \"R Oler\" <[email protected]>\n> Cc: Amsat BB <[email protected]>\n> Subject: [amsat-bb] Re: some exceedingly clever technology\n> Message-ID: <000001cc6489$5f28ac60$0401a8c0@b3o7f1>\n> Content-Type: text/plain;\tcharset=\"iso-8859-1\"\n> \n> Hi Phil, KA9Q\n> \n> What you describes using both magnetorquers ,momentum wheels\n> and CCD video cameras for the attitude control system is what\n> was made on AO40 but it was a big satellite and not a microsatellite.\n> \n> 73\" de\n> \n> i8CVS Domenico\n> \n> ----- Original Message -----\n> From: \"Phil Karn\" <[email protected]>\n> To: \"R Oler\" <[email protected]>\n> Cc: \"Amsat BB\" <[email protected]>\n> Sent: Friday, August 26, 2011 6:54 PM\n> Subject: [amsat-bb] Re: some exceedingly clever technology\n> \n> \n>> On 8/24/11 8:11 PM, R Oler wrote:\n>>> \n>>> http://onorbit.com/node/3709\n>> \n>> Thrusters are necessary for orbit control, but for attitude control\n>> (which I think we really need) you'd *really* prefer something that\n>> doesn't consume a fuel.\n>> \n>> These attitude control systems come in basically two types:\n>> magnetorquers and reaction wheels. Magnetorquers exchange angular\n>> momentum with the earth by acting on its magnetic field, but they tend\n>> to be slow, imprecise and require complex control and sensing systems\n>> including a magnetometer far enough from the spacecraft to get away from\n>> its own magnetic fields.\n>> \n>> Reaction wheels come in two kinds: momentum wheels and control moment\n>> gyros. Momentum wheels change speed while control moment gyros don't.\n>> The latter seem much more common in spacecraft but I'd investigate both.\n>> They're good for quick, accurate pointing like you'd need to keep an\n>> antenna pointed down or a solar panel pointed at the sun.\n>> \n>> Having both a magnetorquer and a set of wheels can be advantageous as\n>> the magnetorquer can be used occasionally to dump accumulated angular\n>> momentum from the wheels should it build up from small external torques.\n>> \n>> Controlling attitude also means measuring it, and for this I keep\n>> thinking about small, cheap CCD video cameras. If we could build good\n>> enough sunshades we could snap pictures of star fields and look them up\n>> in a database. If you can match multiple stars in an image, then a\n>> single image could fix the attitude of the spacecraft. But I'd want to\n>> put a camera on each surface if possible. They could also sense the sun\n>> and the earth, though that's not as simple as it might seem. The sun\n>> usually overloads a CCD and produces streaks while the earth is very\n>> large in LEO. It might be possible to recognize the limb of the earth\n>> and get better precision that way. A lot would depend on the software\n>> processing these images, and it would be a challenge to write.\n>> \n>> -Phil, KA9Q\n>> \n>> _______________________________________________\n>> Sent via [email protected]. Opinions expressed are those of the author.\n>> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n> \n> \n> \n> ------------------------------\n> \n> Message: 5\n> Date: Sat, 27 Aug 2011 12:33:34 +0100\n> From: Pete MI0VAX <[email protected]>\n> To: [email protected]\n> Cc: [email protected]\n> Subject: [amsat-bb] Re: ARISSat-1\n> Message-ID:\n> \t<CANwro_OLKvppVxGBurTwYy4gVhL8NfYBddTjEw5-_YgL0vx8aw@mail.gmail.com>\n> Content-Type: text/plain; charset=ISO-8859-1\n> \n> Hi Carl,\n> \n> I've seen this recently myself too.. On the occasions when it happened here\n> over the UK, the bird \"should\" have been in high power mode, but after\n> looking at telemetry it appears that it had switched into low power mode\n> much earlier that than usual, from memory the footprint was only half in\n> eclipse. Also noticed that before it cuts off that there is usually 10-15 or\n> so seconds of a silent carrier. On another occasion it cut out halfway\n> through a SSTV transmission - this I'm almost certain shouldn't have\n> happened due to the way the firmware was written.\n> \n> Perhaps a bad solar panel contributing to low voltage when approaching\n> eclipse? I had noticed one of the panel temps was over 75c on several\n> passes.\n> \n> It certainly looks like there is some intermittent problems beginning to\n> raise their head, lets hope it's not a steady decline in the bird's\n> performance as gathering the SSTV pics, telemetry etc has been a very\n> enjoyable change to the usual FM/SSB activity.\n> \n> 73 de Pete\n> \n> Mi0VAX\n> \n> \n> On Sat, Aug 27, 2011 at 3:59 AM, Carl Rimmer <[email protected]> wrote:\n>> I was having a really good pass gpong from my NW-SE and I had copied 6\n>> frames of Telemetry and 5 frames of KURSK data when the bird just went\n>> silent. It never came back during this pass. It was the 08-27-2011 0241\n>> UTC pass over Lake Erie. I am curious if anyone has heard it since than.\n>> That is probably the best I have copied it since day one. The frames\n> where\n>> forwarded. The MET was 55' 33\". Bat Voltage = 35.668; Bat Current = -16\n>> ma. I've never heard it just go silent like that and not come back up.\n>> \n>> Carl W8KRF\n>> _______________________________________________\n>> Sent via [email protected]. Opinions expressed are those of the author.\n>> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> \n>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>> \n> \n> \n> ------------------------------\n> \n> Message: 6\n> Date: Sat, 27 Aug 2011 07:50:09 -0500\n> From: Clayton Coleman W5PFG <[email protected]>\n> To: AMSAT <[email protected]>\n> Subject: [amsat-bb] Southwest Texas Grids - August 22/23 SUCCESS!\n> Message-ID:\n> \t<CAPovOwcZFRpC-+eM2Cj0adF_H-viK8VjspENr5e9_WD44X2yPg@mail.gmail.com>\n> Content-Type: text/plain; charset=ISO-8859-1\n> \n> I want to thank all who supported my efforts to activate DL98/DL99 on the\n> Texas/Mexico border. I also made quite a few contacts from EL07 in Laredo,\n> Texas. Despite two border patrol inspection stations and three border\n> patrol \"drive-by's\" while I was operating, the boundary operation went\n> smoothly. APRS coverage was fairly poor for most of the trip unless I was\n> in between major metropolitan areas in the Interstate 35 corridor.\n> \n> My SO-50 operations weren't as smooth as on AO-27 and AO-51 because they\n> were unplanned and I was working them from whatever place I was on the road\n> at AOS. Sometimes it was *not* a great location.\n> \n> Overall I ended up making 102 contacts from grids EM00, EM01, EM02, EL07,\n> EL08, EL09, DL98, and DL99. I've already uploaded these contacts to Logbook\n> of the World. If you would like a paper card, please email me the QSO\n> details or go the usual direct/SASE route.\n> \n> 73,\n> Clayton\n> W5PFG\n> EM21\n> \n> \n> ------------------------------\n> \n> Message: 7\n> Date: Sat, 27 Aug 2011 15:26:30 +0100 (BST)\n> From: paul robinson <[email protected]>\n> To: [email protected]\n> Subject: [amsat-bb] Arissat-1 transponder LAST NIGHT OVER UK\n> Message-ID:\n> \t<[email protected]>\n> Content-Type: text/plain; charset=iso-8859-1\n> \n> 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\n> ?\n> \n> ------------------------------\n> \n> Message: 8\n> Date: Sat, 27 Aug 2011 09:31:39 -0500\n> From: \"Ransom, Kenneth G. (JSC-OC)[BARRIOS TECHNOLOGY]\"\n> \t<[email protected]>\n> To: Carl Rimmer <[email protected]>, \"[email protected]\"\n> \t<[email protected]>\n> Subject: [amsat-bb] Re: ARISSat-1\n> Message-ID:\n> \t<CBB2346C58D9B14983E5AEFE4B3458868EFAA9937B@NDJSSCC01.ndc.nasa.gov>\n> Content-Type: text/plain; charset=\"us-ascii\"\n> \n> Looks like the satellite entered eclipse about that time. The solar panels are all that is powering the satellite now.\n> \n> Kenneth - N5VHO\n> \n> ________________________________________\n> From: [email protected] [[email protected]] On Behalf Of Carl Rimmer [[email protected]]\n> Sent: Friday, August 26, 2011 9:59 PM\n> To: [email protected]\n> Subject: [amsat-bb] ARISSat-1\n> \n> I was having a really good pass gpong from my NW-SE and I had copied 6\n> frames of Telemetry and 5 frames of KURSK data when the bird just went\n> silent. It never came back during this pass. It was the 08-27-2011\n> 0241 UTC pass over Lake Erie. I am curious if anyone has heard it since\n> than. That is probably the best I have copied it since day one. The\n> frames where forwarded. The MET was 55' 33\". Bat Voltage = 35.668; Bat\n> Current = -16 ma. I've never heard it just go silent like that and not\n> come back up.\n> \n> Carl W8KRF\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n> \n> \n> ------------------------------\n> \n> Message: 9\n> Date: Sat, 27 Aug 2011 22:07:31 +0800\n> From: James McBride <[email protected]>\n> To: [email protected]\n> Subject: [amsat-bb] Re: ARISSat-1\n> Message-ID: <[email protected]>\n> Content-Type: text/plain; charset=ISO-8859-1; format=flowed\n> \n> Hi all,\n> I found this morning in VK6 (approx. 03:45 UTC) the MET counter said \n> 21min 45 sec, which is approx. the time ARISSat-1 would have come back \n> into Sunlight. Strange thing is it was on High Power - got plenty of \n> telemetry frames but was discharging at a great rate of knots.. Looking \n> at the data it would seem there was more discharging than charging going \n> on over it's first 21 minutes. 1 panel said 45v, the others were around \n> 15v so the part that was facing direct sunlight was good. I will get \n> another chance perhaps in a few hours to see if it's still alive when \n> not in sunlight and will try to grab some more telemetry.\n> \n> I have a jpg screenshot of telemetry with the position info from earlier \n> if anyone would like it.\n> \n> 73\n> James VK6FJA\n> \n> \n> On 27/08/2011 7:33 PM, Pete MI0VAX wrote:\n>> Hi Carl,\n>> \n>> I've seen this recently myself too.. On the occasions when it happened here\n>> over the UK, the bird \"should\" have been in high power mode, but after\n>> looking at telemetry it appears that it had switched into low power mode\n>> much earlier that than usual, from memory the footprint was only half in\n>> eclipse. Also noticed that before it cuts off that there is usually 10-15 or\n>> so seconds of a silent carrier. On another occasion it cut out halfway\n>> through a SSTV transmission - this I'm almost certain shouldn't have\n>> happened due to the way the firmware was written.\n>> \n>> Perhaps a bad solar panel contributing to low voltage when approaching\n>> eclipse? I had noticed one of the panel temps was over 75c on several\n>> passes.\n>> \n>> It certainly looks like there is some intermittent problems beginning to\n>> raise their head, lets hope it's not a steady decline in the bird's\n>> performance as gathering the SSTV pics, telemetry etc has been a very\n>> enjoyable change to the usual FM/SSB activity.\n>> \n>> 73 de Pete\n>> \n>> Mi0VAX\n>> \n>> \n>> On Sat, Aug 27, 2011 at 3:59 AM, Carl Rimmer<[email protected]> wrote:\n>>> I was having a really good pass gpong from my NW-SE and I had copied 6\n>>> frames of Telemetry and 5 frames of KURSK data when the bird just went\n>>> silent. It never came back during this pass. It was the 08-27-2011 0241\n>>> UTC pass over Lake Erie. I am curious if anyone has heard it since than.\n>>> That is probably the best I have copied it since day one. The frames\n>> where\n>>> forwarded. The MET was 55' 33\". Bat Voltage = 35.668; Bat Current = -16\n>>> ma. I've never heard it just go silent like that and not come back up.\n>>> \n>>> Carl W8KRF\n>>> _______________________________________________\n>>> Sent via [email protected]. Opinions expressed are those of the author.\n>>> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n>>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>>> \n>> _______________________________________________\n>> Sent via [email protected]. Opinions expressed are those of the author.\n>> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n> \n> \n> ------------------------------\n> \n> Message: 10\n> Date: Sat, 27 Aug 2011 13:22:58 -0400 (EDT)\n> From: Douglas Quagliana <[email protected]>\n> To: [email protected], [email protected]\n> Subject: [amsat-bb] Re: ARISSat-1\n> Message-ID: <[email protected]>\n> Content-Type: text/plain; charset=\"us-ascii\"\n> \n> \n> \n> \n> Telemetry came into the Internet telemetry server up until 02:43:37 UTC Aug 27. Then there's no\n> further telemetry until 3:35:46 UTC.\n> \n> If you are receiving telemetry, please turn on the forwarding to the Internet telemetry\n> server, and also please email in your .CSV files to telemetry at arissattlm dot org.\n> \n> Douglas KA2UPW/5 \n> \n> \n> \n> \n> \n> \n> -----Original Message-----\n> From: Carl Rimmer <[email protected]>\n> To: amsat-bb <[email protected]>\n> Sent: Fri, Aug 26, 2011 10:09 pm\n> Subject: [amsat-bb] ARISSat-1\n> \n> \n> I was having a really good pass gpong from my NW-SE and I had copied 6 \n> frames of Telemetry and 5 frames of KURSK data when the bird just went \n> silent. It never came back during this pass. It was the 08-27-2011 \n> 0241 UTC pass over Lake Erie. I am curious if anyone has heard it since \n> than. That is probably the best I have copied it since day one. The \n> frames where forwarded. The MET was 55' 33\". Bat Voltage = 35.668; Bat \n> Current = -16 ma. I've never heard it just go silent like that and not \n> come back up.\n> \n> Carl W8KRF\n> \n> \n> \n> \n> \n> \n> ------------------------------\n> \n> Message: 11\n> Date: Sat, 27 Aug 2011 11:54:42 -0700\n> From: \"Ted\" <[email protected]>\n> To: <[email protected]>\n> Subject: [amsat-bb] SO67 - HO68 Status\n> Message-ID: <F78C6EA03BAC437DB19630942D74BBF5@HamComputer>\n> Content-Type: text/plain;\tcharset=\"us-ascii\"\n> \n> The SA AMSAT site states:\n> \"SO67 suffered another anomaly which means that all amateur activity has\n> been suspended.\"\n> I think the translation is RIP SO67\n> As for HO68, the CAMSAT web page is no longer there\n> I take that as RIP HO68\n> \n> TK\n> K7TRK\n> \n> \n> \n> \n> ------------------------------\n> \n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT member? Join now to support the amateur satellite program!\n> http://amsat.org/mailman/listinfo/amsat-bb\n> \n> \n> End of AMSAT-BB Digest, Vol 6, Issue 492\n> ****************************************\n\n\n\nLou McFadin\nW5DID\nARISS US Hardware manager\n\n\n", "attachments": [] }