August 2011 - AMSAT-BB - mailman.amsat.org

Re: AMSAT-BB Digest, Vol 6, Issue 492
by Louis McFadin 28 Aug '11

28 Aug '11

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, amsat-bb-request(a)amsat.org wrote: > Send AMSAT-BB mailing list submissions to > amsat-bb(a)amsat.org > > 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 > amsat-bb-request(a)amsat.org > > You can reach the person managing the list at > amsat-bb-owner(a)amsat.org > > 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 <john(a)papays.com> > To: amsat-bb(a)amsat.org > Subject: [amsat-bb] CM86/CM96 rare grid activation this Saturday > August 27. > Message-ID: <630032.57810.qm(a)smtp104.sbc.mail.bf1.yahoo.com> > 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 <cfrimmer(a)gmail.com> > To: amsat-bb(a)amsat.org > Subject: [amsat-bb] ARISSat-1 > Message-ID: <4E585DAA.2020503(a)gmail.com> > 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 <clintbradford(a)mac.com> > To: AMSAT BB <amsat-bb(a)amsat.org> > Subject: [amsat-bb] Re: ARISSAT-1 > Message-ID: <7CEFEB35-E86A-4CFC-953D-6A9087035AB1(a)mac.com> > 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" <domenico.i8cvs(a)tin.it> > To: <karn(a)ka9q.net>, "R Oler" <orbitjet(a)hotmail.com> > Cc: Amsat BB <amsat-bb(a)amsat.org> > 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" <karn(a)philkarn.net> > To: "R Oler" <orbitjet(a)hotmail.com> > Cc: "Amsat BB" <amsat-bb(a)amsat.org> > 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 AMSAT-BB(a)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 > > > > ------------------------------ > > Message: 5 > Date: Sat, 27 Aug 2011 12:33:34 +0100 > From: Pete MI0VAX <petemi0vax(a)gmail.com> > To: amsat-bb(a)amsat.org > Cc: cfrimmer(a)gmail.com > Subject: [amsat-bb] Re: ARISSat-1 > Message-ID: > <CANwro_OLKvppVxGBurTwYy4gVhL8NfYBddTjEw5-_YgL0vx8aw(a)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 <cfrimmer(a)gmail.com> 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 AMSAT-BB(a)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 >> > > > ------------------------------ > > Message: 6 > Date: Sat, 27 Aug 2011 07:50:09 -0500 > From: Clayton Coleman W5PFG <kayakfishtx(a)gmail.com> > To: AMSAT <amsat-bb(a)amsat.org> > Subject: [amsat-bb] Southwest Texas Grids - August 22/23 SUCCESS! > Message-ID: > <CAPovOwcZFRpC-+eM2Cj0adF_H-viK8VjspENr5e9_WD44X2yPg(a)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 <pushbiker2004(a)yahoo.co.uk> > To: amsat-bb(a)amsat.org > Subject: [amsat-bb] Arissat-1 transponder LAST NIGHT OVER UK > Message-ID: > <1314455190.10216.YahooMailClassic(a)web27103.mail.ukl.yahoo.com> > 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]" > <kenneth.g.ransom(a)nasa.gov> > To: Carl Rimmer <cfrimmer(a)gmail.com>, "amsat-bb(a)amsat.org" > <amsat-bb(a)amsat.org> > Subject: [amsat-bb] Re: ARISSat-1 > Message-ID: > <CBB2346C58D9B14983E5AEFE4B3458868EFAA9937B(a)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: amsat-bb-bounces(a)amsat.org [amsat-bb-bounces(a)amsat.org] On Behalf Of Carl Rimmer [cfrimmer(a)gmail.com] > Sent: Friday, August 26, 2011 9:59 PM > To: amsat-bb(a)amsat.org > 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 AMSAT-BB(a)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 > > > ------------------------------ > > Message: 9 > Date: Sat, 27 Aug 2011 22:07:31 +0800 > From: James McBride <fjamesa(a)telstra.com> > To: amsat-bb(a)amsat.org > Subject: [amsat-bb] Re: ARISSat-1 > Message-ID: <4E58FA23.5090202(a)telstra.com> > 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<cfrimmer(a)gmail.com> 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 AMSAT-BB(a)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(a)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 > > > ------------------------------ > > Message: 10 > Date: Sat, 27 Aug 2011 13:22:58 -0400 (EDT) > From: Douglas Quagliana <dquagliana(a)aol.com> > To: cfrimmer(a)gmail.com, amsat-bb(a)amsat.org > Subject: [amsat-bb] Re: ARISSat-1 > Message-ID: <8CE32F5195685F9-AD0-11D97(a)webmail-d017.sysops.aol.com> > 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 <cfrimmer(a)gmail.com> > To: amsat-bb <amsat-bb(a)amsat.org> > 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" <k7trkradio(a)charter.net> > To: <amsat-bb(a)amsat.org> > 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 amsat-bb(a)amsat.org. 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

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W6NBC Quadrifilar Antenna
by Thomas Doyle 28 Aug '11

28 Aug '11

I would like to talk with someone who has actually built a W6NBC quadrifilar helix. I want to make sure I have sorted out the errors in the article and the .PDF file embedded note. 73 W9KE tom ...

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rotor ???
by Bob- W7LRD 28 Aug '11

28 Aug '11

Forgot to mention software is satpc32 Bob

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Edusat failure..?
by Gi. AB2VY 28 Aug '11

28 Aug '11

Hi to all, after about 2 weeks from deployment , Edusat satellite appears not to have transmit any single radio signal from space on the spectrum of UHF and S-Band, No news or report from University of Rome , who coordinate in part the project http://www.gaussteam.com/ , only the notice of succesful launch.. but not other Mission Failed?? 73 de Giulio AB2VY (watching IRENE coming here in NJ..)

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smal sat
by nick pugh k5qxj 28 Aug '11

28 Aug '11

I will be attending Small Sat who else is attending ? nick

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rotor ???
by Bob- W7LRD 28 Aug '11

28 Aug '11

Hello I need some ideas in trouble shooting my LVB tracker problem. The computer quit talking to the tracker. The doppler part is ok, to the 910. when I try to "park" the antenna...nothing. My LVB uses a serial port on the computer. Ideas please. 73 Bob W7LRD Seattle

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ARISSat1 Telemetry
by Michael A. Connors 28 Aug '11

28 Aug '11

I believe that there is at least one frame of emergency power telemetry in this attached file, the others I believe indicated high power. I believe that the voltage indicated was about 35.6 while in emergency power mode. I could only hear the satellite for about 3 minutes. It was only 10° elevation at the apex from my QTH in New Mexico. My antenna system is a small horizonially polarized 7 element cheap yagi and mast mounted pre-amp. I hope this information helps indicate the health of the satellite. It almost seems like a software bug and not a battery problem. The satellite seems to switch to low power unnecessarily when the voltage the telemetry indicated is greater than 35. Regards, Mike, KI7AB

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ARISSat-1 Pass Over DO33 2011-08-28
by B J 28 Aug '11

28 Aug '11

No CW beacon was heard. FM downlink was acquired at 0312 UTC with at least S7 and no fading but some noise. MET = 49 minutes IHU temp = +39 degrees C (not sure about final integer due to noise) Control panel temp = +28 degrees C Battery voltage = 35.70 Volts Battery current = -12 mA Transmission stopped at 0313 and resumed at 0315 with ID and greeting. 73s Bernhard VA6BMJ @ DO33FL

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XE1AO IN DK88
by Omar Alvarez 28 Aug '11

28 Aug '11

Thank you for all the QSO in AO-27 at 20:03 UTC 2011-08-27. The QSO will be upload to LotW as XE1AO next monday afternoon after work. If someone need the print QSL please email me; not SASE or green stamp is required. Mi log with the arrow antenna anf FT-60R: CO6CBF 20:03 UTC KD8KSN 20:03 K4FEG 20:04 WC7V 20:04 AA5PK 20:04 N9IP 20:05 KG7EZ 20:05 AJ5C 20:07 KI6YAA 20:08 Regards Omar XE1AO DK89df ******************************** M.C. Omar Alvarez Cárdenas Facultad de Telematica, U de C 316 1075 xe1aom(a)ucol.mx omar_ac(a)hotmail.com ********************************

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Apology
by WILLIAMS MICHAEL 27 Aug '11

27 Aug '11

Joe (K3SZH), I'm sorry. Will you forgive me? Life is short, and this hobby should be enjoyed to its fullest. 73, Mike (K9QHO)

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