[amsat-bb] ARISSat-1 Pass Over DO33 2011-08-17
I acquired the FM downlink signal at 0600 UTC and heard part of the diagnostic message and the ID. The signal initially wasn't clear but it improved by 0602 with little noise, strength of at least S8, and no fading. At 0602, the following was transmitted after the ID and greeting: MET = 65 minutes IHU temp. = +41 deg. C Control panel temp. = +56 deg. C Battery voltage = ?? The transmission appeared to stop at that point and nothing further was heard. 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
[amsat-bb] Edusat
Hi all, We understand that the Edusat spacecraft from Italy has been successfully launched today from Yasny on a DNEPR launcher. It has apparently been granted an experimental licence by the Italian Telecommunications Ministry to transmit on 435.750MHz but this frequency was not submitted for coordination by the the IARU Frequency Coordination Panel. We understand that it may only be transmitting when over Rome and that it will use 9k6 GMSK 73 Graham G3VZV ___ 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
[amsat-bb] ARISSat-1 – telemetry top submitters
http://www.dk3wn.info/p/?p=22435 73 de Roland PY4ZBZ ___ 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
[amsat-bb] Re: ARISSat-1 – telemetry top submitters
Nice page On Aug 17, 2011, at 5:58 AM, Roland Zurmely wrote: http://www.dk3wn.info/p/?p=22435 73 de Roland PY4ZBZ ___ 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
[amsat-bb] Re: Edusat
Hi Graham, G3VZV Edusat has been built by students of the university La Sapienza in Roma Italy but since no technical informations has been released and it transmit only telemetry in GMSK when over Roma it seems that Edusat is not of interest for the satellite amateur community but without the coordination of the IARU Frequency Coordination Panel it seems that Edusat is another bad strategy to use our frequency for private use without to pay for. http://www.ansa.it/scienza/notizie/rubriche/spazioastro/2011/08/12/visualizz a_new.html_755683043.html http://www.ansa.it/web/notizie/rubriche/scienza/2011/08/17/visualizza_new.ht ml_754699718.html 73 de i8CVS Domenico - Original Message - From: g.shirvi...@btinternet.com To: AMSAT BB amsat-bb@amsat.org Sent: Wednesday, August 17, 2011 12:01 PM Subject: [amsat-bb] Edusat Hi all, We understand that the Edusat spacecraft from Italy has been successfully launched today from Yasny on a DNEPR launcher. It has apparently been granted an experimental licence by the Italian Telecommunications Ministry to transmit on 435.750MHz but this frequency was not submitted for coordination by the the IARU Frequency Coordination Panel. We understand that it may only be transmitting when over Rome and that it will use 9k6 GMSK 73 Graham G3VZV ___ 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
[amsat-bb] Re: ARISSat-1 â telemetry top submitters
Thanks Mike and Roland, I was curious about the relative value that our telemetry had to the project (i.e. was there a deluge, not enough, just right). A question for all, for a few days now my ARISSatTLM has been reporting the Kursk as being (I believe, I'm not at home to check right now) something like Kursk-944.x or perhaps it was Kursk-444.x (some real low number compared to previous in my log) and it has not reported any new Kursk frames for the past 3 days or so at least on the ARISSatTLM display. I see from Mike's page that my Kursk to Telem ratio is lower than many. Is the Kursk data affected by the battery state, or is my ARISSatTLM perhaps hung up on that and needs a restart? Anyone else, what are the latest Kursk frames that you are seeing? Thanks and 73, Jerry N0JY http://www.dk3wn.info/p/?p=22435 73 de Roland PY4ZBZ ___ 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
[amsat-bb] Re: ARISSat-1 – telemetry top submitters
G'day Jerry, I don't think there's anything wrong with your ARISSatTLM, as I've only been getting KURSK-944s since the 13th. My last 'proper good' experiment frame was: 2011/08/11-08:12:48 Received Kursk frame 2 with MET=650105 len=516. Satellite MET around then was: 2011/08/11-08:12:54 Received telemetry frame with MET=653412 Len=371 I missed the 12th, and on the 13th the telemetry and experiment MET had reset: 2011/08/13-04:34:16 Received telemetry frame with MET=2514 Len=371 ... 2011/08/13-04:34:24 Received Kursk frame 3 with MET=944 len=516. Do we have C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.3? 2011/08/13-04:34:24 No. Saving to C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.3. And from that point on, I have only received KURSK-944 frames (which are still auto-forwarding). 2011/08/17-05:30:04 Received Kursk frame 5 with MET=944 len=48. Do we have C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.5? 2011/08/17-05:30:04 Yes. C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.5 exists. 73, Ben VK2FBRB On Wed, Aug 17, 2011 at 11:08 PM, n...@lavabit.com wrote: A question for all, for a few days now my ARISSatTLM has been reporting the Kursk as being (I believe, I'm not at home to check right now) something like Kursk-944.x or perhaps it was Kursk-444.x (some real low perhaps hung up on that and needs a restart? Anyone else, what are the latest Kursk frames that you are seeing? ___ 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
[amsat-bb] Re: MARK AUSTIN KB1GRV
You can leave some thoughts online for Mark's family at: http://obituaries.bangordailynews.com/obituaries/bangordailynews/obituary.aspx?page=lifestorypid=153127129 Kenneth - N5VHO -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Jeff KB2M Sent: Tuesday, August 16, 2011 7:50 PM To: amsat-bb@amsat.org Cc: kb...@amsat.org Subject: [amsat-bb] Re: MARK AUSTIN KB1GRV This is very sad news. I met Mark in person in 2002 or so on one of my many trips to Bar Harbor Maine. We became acquainted by sending text messages via MIR then ISS. Marks love of the MIR/ISS packet network was very profound. Last time I had dinner with Mark while passing through Ellsworth on my way to work on the Bucks Harbor ARSR4 radar he gave me an 8x10 picture of him with the race car he was involved in. I just went out in the garage and found it and plan on framing it and hanging it in my shack. Mark will be missed on the ISS. 73 Jeff kb2m -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Pete Norris Sent: Tuesday, August 16, 2011 13:31 PM To: amsat-bb@amsat.org Cc: kb...@amsat.org Subject: [amsat-bb] MARK AUSTIN KB1GRV Hi all:I received this from Phil, N1EP. I thought there would be a number of you that might like to know.Pete, K1HZU Hello Folks, If you have not heard already, local (Franklin/Ellsworth) ham Mark Austin, KB1GVR, became a silent key on August 8. Graveside services will be this Thursday, Aug 18, at 11AM at Woodbine cemetery in Ellsworth. Mark was very prolific in space communications. In 2002, he told me that he was listening to his scanner, I think in 1997, and heard Russian voices coming over the speaker about every hour and 36 minutes. He discovered the voices were from cosmonauts on board the Mir Space Station. He then started recording their SSTV broadcasts and then went out and bought his first computer so he could see the pictures he had previously recorded from the Soviet slow scan TV transmissions. That inspired him to earn his ham ticket so he could talk to the cosmonauts. And talk, he did. Since then, Mark has become well known aboard the space shuttles and International Space Station by many astronauts and cosmonauts. Not only has Mark talked to them on voice mode, but became extremely proficient at using the space station and satellites to communicate digitally. He even discovered a new way of using one particular satellite to extend communication capability. Mark had the opportunity to meet some of the spacemen he had befriended on-the-air when he made visits to Mission Control in Houston and to Kennedy Space Center, where he also was thrilled to watch a shuttle launch. His enthusiasm with space communications inspired many hams to give it a try, including myself. His advice was spot on so that I twice successfully made voice contacts to the space station. I also had fun with Oscar-14 with Mark's tips. If you operated an APRS station in Maine, you would recognize the KB1GVR call sign, as Mark was also an avid APRS fan. Mark's other pastimes included racing and flying with his brother in his plane where his same determination brought him lots of success, rewards, and joy. The walls of Marks home were decorated with the many ham radio and racing certificates and awards he had earned and his vast collection of space communications QSL cards is amazing, as many EAWA members can attest to as Mark has brought them in for display in the past. Mark was only 50 years old, but in his too-short life, he accomplished a lot. As N1DP said on last night's Washington County ARES Net, Godspeed Mark. We will miss you. 73, Phil Duggan, N1EP ___ 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 ___ 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
[amsat-bb] Re: ARISSat-1 – telemetry top submitters
Hi Jerry, ... let me explain what the graph means. All these data are based on the STP telemetry files from the AMSAT-FTP server (Kursk / Spacecraft). Every telemetry frame exist only once. So the graph represents NOT really the amount of submitted frames per sender. If 10 stations listen to ARISSat and every station is forwarding the telemetry to the server - only one packet wins. Maybe the first one (due to the speed of internet connection or whatever). That means if you live in New Zealand - you have a greater chance to see your submitted packets on the server as we in Europe or you in the US. I can confirm the second issue - regarding the KURSK files. There are no new telemetry data on my hard disk since August 13. I know that I have received KURSK data but they did not appear in the telemetry directory. But you can see on the AMSAT FTP server that the latest KURSK frames are from Aug 16 - so they are transferred to the server... 73, Mike DK3WN -Ursprüngliche Nachricht- Von: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] Im Auftrag von n...@lavabit.com Gesendet: Mittwoch, 17. August 2011 15:08 An: Roland Zurmely Cc: AMSAT Betreff: [amsat-bb] Re: ARISSat-1 – telemetry top submitters Thanks Mike and Roland, I was curious about the relative value that our telemetry had to the project (i.e. was there a deluge, not enough, just right). A question for all, for a few days now my ARISSatTLM has been reporting the Kursk as being (I believe, I'm not at home to check right now) something like Kursk-944.x or perhaps it was Kursk-444.x (some real low number compared to previous in my log) and it has not reported any new Kursk frames for the past 3 days or so at least on the ARISSatTLM display. I see from Mike's page that my Kursk to Telem ratio is lower than many. Is the Kursk data affected by the battery state, or is my ARISSatTLM perhaps hung up on that and needs a restart? Anyone else, what are the latest Kursk frames that you are seeing? Thanks and 73, Jerry N0JY http://www.dk3wn.info/p/?p=22435 73 de Roland PY4ZBZ ___ 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 ___ 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
[amsat-bb] KB1GVR
I think Mark was My first 2 way packet contact on ISS and also NO 44 . Thought I had a qsl card from Him but can't find it . He was one of the few that could reach NO-44 when no one else was getting there . Miss You on the birds Mark . Congrats Kevin , not much traffic on NO-44 ( w3ado-1 ) I guess because it's so hard to reach . Will look for You there. Jerry WB5LHD ___ 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
[amsat-bb] Re: KB1GVR
Congrats Kevin , not much traffic on NO-44 ( w3ado-1 ) I guess because it's so hard to reach . No, it can hear a 5W HT (when close), but the problem is that it's battery is dead. It can save up enough energy during a mid-day pass to maybe support one or two successful packets. But any other packets simply kill it back to zero. That is what is so sad. There are a few dozen people who operte permanent beacons on the channel just so they can be heard, but in so doing, the unattended beacons are killing the battery that real-live people could actually use. If we could just get all the UNATTENDED stations on the ISS and PCSAT (w3ado-1) uplink to be silent so that the manned stations wouidl have less congestion (or more power on PCSAT), then maybe 1 or two packets per pass couild be successful via PCSAT (again, though, only during mid-day when the sun is right on its best angle to the best panel). You can hear the problem on every packet. There is not even enough battery amps to finish a complet4e packet. Bob, Wb4APR ___ 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
[amsat-bb] Re: ARISSAT-1 report
Hi Graham, Hope you are enjoying your trip. I also have heard breaks in transmission, but believed this was normal. (I have only begun properly monitoring the sat last night due to the track taking it overhead UK very late and as it got earlier the batteries gave up so it was off - only now is it barely still illuminated when passing) 73 Pete Mi0VAX On Mon, Aug 15, 2011 at 3:17 PM, g.shirvi...@btinternet.com wrote: Hi All, Just popped outside from the IARU Region 1 Conference meeting to catch an ARISSAT pass. Good signals with an Arrow and a FCD and also using a G0MRF prototype filter amplifier with 5v being supplied by the Dongle. (Thanks David for the loan) Voice telemetry reported MET of 41 mins - which corresponds very well to when it left eclipse over the Pacific. Battery volts 35.74 and current -4ma I just failed to identify a ZS station using the transponder! The signal had no fading but several occasional ~ 100 msec breaks in transmission were noted. best 73 from sunny ZS6 land Graham G3VZV ___ 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
[amsat-bb] Beaconers
Bob is absolutely right, the people beaconing on 145.825 are ruining it for others. Which reminds me of the spanking I got for using FM on the SSB birds, I am sure there would be a lot bigger stink if people were affecting those satellites and not just the poor forgotten and obviously abused NO-44, and the countless people trying to talk to beacons on the ISS... I like my call showing up on the ISS/NO-44 page just as much as the next guy, but I do it myself not while I am at work or sleeping. Thanks by the way for the recent fun contacts on the ISS, I am sure the beacon comments were just as well veiwed as the Qso's... Kevin KF7MYK ___ 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
[amsat-bb] Re: ARISSat-1 telemetry top submitters
Hi all, According to my logs the last Kursk frame I received on the 0405UT pass on 12 August was 720206. The first Kursk frame on the 12 August 2035UT pass was 944. The interesting thing was that it apparently treated this as a valid frame. i.e it accumulated and combined all five parts. All Kursk frames from that point onward have been treated as exists and ignored. 2011/08/12-20:36:44 Received Kursk frame 5 with MET=944 len=48. Do we have C:\ARISSatTLM\Kursk\KURSK-944.5? 2011/08/12-20:36:44 No. Saving to C:\ARISSatTLM\Kursk\KURSK-944.5. 2011/08/12-20:36:44 Checking for all five parts. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.1: OK. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.2: OK. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.3: OK. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.4: OK. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.5: OK. 2011/08/12-20:36:44 Combining KURSK parts into C:\ARISSatTLM\Kursk\KURSK-944.EXP. 2011/08/12-20:36:44 Done combining. 2011/08/12-20:36:44 Forwarding from ZL2BX to telemetry.arissattlm.org frame type E 2011/08/12-20:36:50 Received telemetry frame with MET=1589 Len=371 2011/08/12-20:36:50 Forwarding from ZL2BX to telemetry.arissattlm.org frame type T 2011/08/12-20:36:58 Received Kursk frame 1 with MET=944 len=516. Do we have C:\\ARISSatTLM\Kursk\KURSK-944.1? 2011/08/12-20:36:58 Yes. C:\ARISSatTLM\Kursk\KURSK-944.1 exists. 2011/08/12-20:36:58 Forwarding from ZL2BX to telemetry.arissattlm.org frame type E 73 Alan ZL2BX -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Ben Bishop Sent: Wednesday, 17 August 2011 14:36 To: AMSAT Cc: n...@lavabit.com Subject: [amsat-bb] Re:ARISSat-1 – telemetry top submitters G'day Jerry, I don't think there's anything wrong with your ARISSatTLM, as I've only been getting KURSK-944s since the 13th. My last 'proper good' experiment frame was: 2011/08/11-08:12:48 Received Kursk frame 2 with MET=650105 len=516. Satellite MET around then was: 2011/08/11-08:12:54 Received telemetry frame with MET=653412 Len=371 I missed the 12th, and on the 13th the telemetry and experiment MET had reset: 2011/08/13-04:34:16 Received telemetry frame with MET=2514 Len=371 2011/08/13-04:34:24 Received Kursk frame 3 with MET=944 len=516. Do we have C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.3? 2011/08/13-04:34:24 No. Saving to C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.3. And from that point on, I have only received KURSK-944 frames (which are still auto-forwarding). 2011/08/17-05:30:04 Received Kursk frame 5 with MET=944 len=48. Do we have C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.5? 2011/08/17-05:30:04 Yes. C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.5 exists. 73, Ben VK2FBRB On Wed, Aug 17, 2011 at 11:08 PM, n...@lavabit.com wrote: A question for all, for a few days now my ARISSatTLM has been reporting the Kursk as being (I believe, I'm not at home to check right now) something like Kursk-944.x or perhaps it was Kursk-444.x (some real low perhaps hung up on that and needs a restart? Anyone else, what are the latest Kursk frames that you are seeing? ___ 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 - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1392 / Virus Database: 1520/3840 - Release Date: 08/17/11 ___ 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
[amsat-bb] Re: Turn off AGC when receiving BPSK-1000
Hi Phil, This is a great reminder. Thus far, my data has been collected with the TS-2000x using a mid setting for AGC; and with the HDSDR software set to AGC Med when using/playing back Funcube Dongle data. I've set both to OFF now, since it's possible I wonder if anybody has experimented with AGC settings and the HDSDR decoding? Might be worth running a recording through a few times at various settings..hrm. In any event, Phil...THANK YOU for making this code real. I have seen it print data when the signal was visibly in the dirt which is impressive and fun to see. 73! Mark N8MH At 02:31 PM 8/16/2011 -0700, Phil Karn wrote: I forgot to offer some advice when receiving the ARISSat-1 BPSK-1000 telemetry beacon: turn off your receiver AGC if at all possible. If you can only choose between fast and slow, pick slow. If this causes a large variation in audio level, reduce the gain to avoid clipping on the peaks. A sound card A/D is 16 bits so you have plenty of dynamic range; don't be afraid to use it. Ideally the background noise level should be constant with the signal going up and down. This greatly helps the demodulator and decoder to distinguish signal from noise. The error correction uses the Viterbi algorithm, and one of its big features is the ability to distinguish between strong and weak bits; a strong '1' or '0' is considered less likely to be in error than a weak '1' or '0'. The decoder can even accept I don't know for a limited number of bits. The decoder can still fix errors in strong bits. But it can fix more of them in the weak bits and still more in the I don't knows (known technically as erasures). This is especially important when the signal fades deeply, as it often does with ARISSat-1. With the AGC off, the audio signal level falls during a fade and the decoder can recognize it as a burst of erasures or near-erasures. As with many questions in life, I don't know or I think it's X but I'm not sure are better answers than being sure of the wrong answer. 73, Phil ___ 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
[amsat-bb] Edusat and Kentucky
Looks like Edusat will be partially controlled here from the U.S., right down the road in Kentucky. This is Dr. Ben Malphrus KJ4HJV of the Morehead Space Science program.Sounds like they are preparing to test a Femtosat deployment system. I should point out, this is where Bob Twiggs is currently teaching. http://www.youtube.com/watch?v=ljnK2LVi9hw Charlie Cantrill KI4RDT ___ 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
[amsat-bb] ARRISSat-1 Heard Passing Over Cuba
On Wednesday, August 17 heard a very weak ARISSat-1 on 2M 145.950 FM pass over northeast Camaguey, Cuba for less than thirty seconds in SSTV mode. Minutes later it was tracking northeast towards northern Cat island, The Bahamas at 2242 UTC. Azimuth 139, Elevation +22 according to my satellite tracking program. 73's Mike Schaffer KA3JAW Tampa, Florida EL87 ___ 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
[amsat-bb] Re: Turn off AGC when receiving BPSK-1000
Hi Mark, Phil, That's interesting. I have collected all my passes on the TS2000 with the AGC on and set to the longest setting. This is mainly because I often record the signal level every 0.5 seconds during a pass which requires the AGC to be on and the longest setting irons out any short fades. I will turn the AGC off and look at the statistics over a few passes but given that with the AGC on I get almost all the available frames I don't expect to see much difference. It will be interesting to see. 73 Alan ZL2BX -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Mark L. Hammond Sent: Wednesday, 17 August 2011 20:36 To: Phil Karn; Amsat - BBs Subject: [amsat-bb] Re: Turn off AGC when receiving BPSK-1000 Hi Phil, This is a great reminder. Thus far, my data has been collected with the TS-2000x using a mid setting for AGC; and with the HDSDR software set to AGC Med when using/playing back Funcube Dongle data. I've set both to OFF now, since it's possible I wonder if anybody has experimented with AGC settings and the HDSDR decoding? Might be worth running a recording through a few times at various settings..hrm. In any event, Phil...THANK YOU for making this code real. I have seen it print data when the signal was visibly in the dirt which is impressive and fun to see. 73! Mark N8MH At 02:31 PM 8/16/2011 -0700, Phil Karn wrote: I forgot to offer some advice when receiving the ARISSat-1 BPSK-1000 telemetry beacon: turn off your receiver AGC if at all possible. If you can only choose between fast and slow, pick slow. If this causes a large variation in audio level, reduce the gain to avoid clipping on the peaks. A sound card A/D is 16 bits so you have plenty of dynamic range; don't be afraid to use it. Ideally the background noise level should be constant with the signal going up and down. This greatly helps the demodulator and decoder to distinguish signal from noise. The error correction uses the Viterbi algorithm, and one of its big features is the ability to distinguish between strong and weak bits; a strong '1' or '0' is considered less likely to be in error than a weak '1' or '0'. The decoder can even accept I don't know for a limited number of bits. The decoder can still fix errors in strong bits. But it can fix more of them in the weak bits and still more in the I don't knows (known technically as erasures). This is especially important when the signal fades deeply, as it often does with ARISSat-1. With the AGC off, the audio signal level falls during a fade and the decoder can recognize it as a burst of erasures or near-erasures. As with many questions in life, I don't know or I think it's X but I'm not sure are better answers than being sure of the wrong answer. 73, Phil ___ 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 - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1392 / Virus Database: 1520/3841 - Release Date: 08/17/11 ___ 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
[amsat-bb] ARISSat clock and TLM records
Now that the ARISSat clock seems to be resetting on a regular basis I am wondering how this will affect the TLM and Kursk data which I am capturing and uploading. It seems to me that the only way of collating the data is by the time of upload to telemetry.arissattlm.org Dick G4BBH ___ 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
[amsat-bb] ISS School QSO
I am portable in Alabama and do not have access to my past e-mail. A post a day or so ago had information about a school that had a scheduled QSO with the ISS on August 18. I am at a camp in Alabama and would love to at least monitor the conversation coming from the ISS. Would someone repost the info or contact me directly with a copy of the post. 73, James W5AOO l...@wt.net ___ 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
[amsat-bb] Official Word for the 70cm Antenna?
Mike Schaffer KA3JAW Tampa, Florida EL87 What is the official AMSAT/ARISSat1 team finding on the ARISSat-1 70cm quarter-wave receive antenna on the bottom of the satellite? I have not heard updated news about that since the jettison occurred. Was it the dummy load or was the dummy load taken off and the flight antenna installed to deployment while in the ISS ,but later accidentally broken off when the cosmonauts hand carried it through the Pirus hatch? ___ 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
[amsat-bb] Re: Decoding wideband recordings
Thanks Bruce. I think I need to go get a preamp and filter! And try again. 73, tom n4zpt On 8/14/2011 12:06 PM, Bruce Robertson wrote: On Sat, Aug 13, 2011 at 7:07 PM, Phil Karnk...@philkarn.net wrote: On 8/10/11 8:24 PM, Tom Azlin N4ZPT wrote: I have a Fun Cube Dongle so I would Phil. Thanks and 73, Tom n4zpt Okay, everybody make and keep your wideband I/Q recordings and I'll work on an enhancement to my demodulation/decoding software to process them. It may not run in real time on slower machines because of the need to search a wider frequency range, but this won't matter if it can work on a recording. I can probably speed things up by including an orbit model in the modem to predict Doppler open-loop, but this will take time to implement and it will still be vulnerable to small errors in the elements and/or your clock, especially around closest approach. So record the date and time of your recordings and the current eleset at that time. For those who have not noted this feature, HDSDR will open a recording scheduler if you right click on the 'record' button. It saves files with UTC time appended. The tricky part is that you have to set the scheduler manually in local time. I've been thinking it would be a nifty hack to make a FCD recorder for a set of satellites using a very small computer, like the BeagleBoard. It seems to me that a daily cron job with 'Predict' would just about do what was necessary, especially now that we have a commandline tool for the FCD. The only part that would take some fiddling would be piping the USB sound card into a file with the proper headers for HDSDR. 73, Bruce VE9QRP ___ 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
[amsat-bb] Re: ARISSat-1 telemetry top submitters
Alan, The last KURSK segment I received were 741858 on the 12th August. My educated guess is that because ARISSAT1 is resetting during every eclipse the KURSK experiment is not able to obtain the MET and use it as a file name. Hence it is defaulting to 944. 73 Colin VK5HI -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Alan Cresswell Sent: Thursday, 18 August 2011 05:49 To: 'Ben Bishop'; 'AMSAT' Subject: [amsat-bb] Re: ARISSat-1 telemetry top submitters Hi all, According to my logs the last Kursk frame I received on the 0405UT pass on 12 August was 720206. The first Kursk frame on the 12 August 2035UT pass was 944. The interesting thing was that it apparently treated this as a valid frame. i.e it accumulated and combined all five parts. All Kursk frames from that point onward have been treated as exists and ignored. 2011/08/12-20:36:44 Received Kursk frame 5 with MET=944 len=48. Do we have C:\ARISSatTLM\Kursk\KURSK-944.5? 2011/08/12-20:36:44 No. Saving to C:\ARISSatTLM\Kursk\KURSK-944.5. 2011/08/12-20:36:44 Checking for all five parts. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.1: OK. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.2: OK. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.3: OK. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.4: OK. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.5: OK. 2011/08/12-20:36:44 Combining KURSK parts into C:\ARISSatTLM\Kursk\KURSK-944.EXP. 2011/08/12-20:36:44 Done combining. 2011/08/12-20:36:44 Forwarding from ZL2BX to telemetry.arissattlm.org frame type E 2011/08/12-20:36:50 Received telemetry frame with MET=1589 Len=371 2011/08/12-20:36:50 Forwarding from ZL2BX to telemetry.arissattlm.org frame type T 2011/08/12-20:36:58 Received Kursk frame 1 with MET=944 len=516. Do we have C:\\ARISSatTLM\Kursk\KURSK-944.1? 2011/08/12-20:36:58 Yes. C:\ARISSatTLM\Kursk\KURSK-944.1 exists. 2011/08/12-20:36:58 Forwarding from ZL2BX to telemetry.arissattlm.org frame type E 73 Alan ZL2BX -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Ben Bishop Sent: Wednesday, 17 August 2011 14:36 To: AMSAT Cc: n...@lavabit.com Subject: [amsat-bb] Re:ARISSat-1 – telemetry top submitters G'day Jerry, I don't think there's anything wrong with your ARISSatTLM, as I've only been getting KURSK-944s since the 13th. My last 'proper good' experiment frame was: 2011/08/11-08:12:48 Received Kursk frame 2 with MET=650105 len=516. Satellite MET around then was: 2011/08/11-08:12:54 Received telemetry frame with MET=653412 Len=371 I missed the 12th, and on the 13th the telemetry and experiment MET had reset: 2011/08/13-04:34:16 Received telemetry frame with MET=2514 Len=371 2011/08/13-04:34:24 Received Kursk frame 3 with MET=944 len=516. Do we have C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.3? 2011/08/13-04:34:24 No. Saving to C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.3. And from that point on, I have only received KURSK-944 frames (which are still auto-forwarding). 2011/08/17-05:30:04 Received Kursk frame 5 with MET=944 len=48. Do we have C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.5? 2011/08/17-05:30:04 Yes. C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.5 exists. 73, Ben VK2FBRB On Wed, Aug 17, 2011 at 11:08 PM, n...@lavabit.com wrote: A question for all, for a few days now my ARISSatTLM has been reporting the Kursk as being (I believe, I'm not at home to check right now) something like Kursk-944.x or perhaps it was Kursk-444.x (some real low perhaps hung up on that and needs a restart? Anyone else, what are the latest Kursk frames that you are seeing? ___ 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 - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1392 / Virus Database: 1520/3840 - Release Date: 08/17/11 ___ 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
[amsat-bb] Re: Turn off AGC when receiving BPSK-1000
On 8/17/11 1:36 PM, Mark L. Hammond wrote: In any event, Phil...THANK YOU for making this code real. I have seen it print data when the signal was visibly in the dirt which is impressive and fun to see. You're most welcome. It was a lot of work mainly because there were so many options in the design that were hard to nail down. Nobody really knew how fast the fading would be, or how long the data frames should or would be, or how fast the telemetry values would change, or the frequency and phase response of all the SSB receivers people would use to receive the telemetry, or the accuracy of the A/D clocks in their computers, or the type and speed of their CPUs, or the experience level of the operators and whether they'd used automatic or manual tuning. I did know that there would be fading, probably very deep. I knew the orbit would be that of the ISS so I knew the passes would be short with fierce Doppler. I knew that the beacon would operate in a broadcast mode so latency wasn't a major concern. So I went for a conservative, robust design. I didn't try to maximize the data rate or minimize latency as I might have on a Pacsat being used for interactive and store-and-forward user communications. Those things might have made the signal much less robust especially by impairing its fade resistance. I think my emphasis on fade resistance has definitely paid off, but I'm less happy with its tolerance (or lack thereof) of various frequency errors, from Doppler correction to off-frequency A/D clocks in computer sound interfaces. But that's one of the reason we fly these things, to get that kind of experience for the next time. Another thing this mission (and many previous amateur satellites) shows is that the one thing we really, really need on our small satellites is a good attitude determination and control system. One would make *so* many problems just go away: We could mount microwave antennas on a nadir-facing surface and provide consistent, predictable, strong, wideband signals to ground stations during a pass. We could mount our solar panels on rotating booms to track the sun and generate far more power from a given number of (very expensive) cells than we now get by hedging our bets and covering every outside surface. We could predict and control spacecraft heat flows and temperatures far more easily. We'd know where our cameras are pointing and we could take pictures of predetermined targets. The problem consists of two parts: attitude determination and attitude control. For determination I keep thinking that we should be able to do a lot with small, light and inexpensive CCD cameras. With proper light baffling it should be possible to see stars even in the daytime, and onboard software with a star chart could figure out which they are. For attitude control, I think control moment gyros are the way to go. (They're somewhat different from momentum wheels in that they operate at constant speed.) This is largely a mechanical problem: designing flywheels and motors that are small, lightweight, can store a lot of angular momentum, draw minimal power, and be precisely moved around to control the direction and magnitude of the overall spacecraft angular momentum vector. We'd still need magnetorquing coils to dump excess momentum, but the cm gyros would provide quick and accurate control of spacecraft attitude. -Phil ___ 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
[amsat-bb] Re: ARISSat-1 telemetry top submitters
Hi Colin, Yes, the other interesting thing is that recently ARISsat has been coming out of eclipse not too long before the start of my morning passes. On those occasions I have received anything up to 19 consecutive data frames (or about 3 minutes) before I receive the first Kursk frame. 73 Alan ZL2BX -Original Message- From: Colin Hurst [mailto:cjhu...@bigpond.net.au] Sent: Thursday, 18 August 2011 01:21 To: 'Alan Cresswell'; 'Ben Bishop'; 'AMSAT' Subject: RE: [amsat-bb] Re: ARISSat-1 telemetry top submitters Alan, The last KURSK segment I received were 741858 on the 12th August. My educated guess is that because ARISSAT1 is resetting during every eclipse the KURSK experiment is not able to obtain the MET and use it as a file name. Hence it is defaulting to 944. 73 Colin VK5HI -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Alan Cresswell Sent: Thursday, 18 August 2011 05:49 To: 'Ben Bishop'; 'AMSAT' Subject: [amsat-bb] Re: ARISSat-1 telemetry top submitters Hi all, According to my logs the last Kursk frame I received on the 0405UT pass on 12 August was 720206. The first Kursk frame on the 12 August 2035UT pass was 944. The interesting thing was that it apparently treated this as a valid frame. i.e it accumulated and combined all five parts. All Kursk frames from that point onward have been treated as exists and ignored. 2011/08/12-20:36:44 Received Kursk frame 5 with MET=944 len=48. Do we have C:\ARISSatTLM\Kursk\KURSK-944.5? 2011/08/12-20:36:44 No. Saving to C:\ARISSatTLM\Kursk\KURSK-944.5. 2011/08/12-20:36:44 Checking for all five parts. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.1: OK. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.2: OK. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.3: OK. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.4: OK. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.5: OK. 2011/08/12-20:36:44 Combining KURSK parts into C:\ARISSatTLM\Kursk\KURSK-944.EXP. 2011/08/12-20:36:44 Done combining. 2011/08/12-20:36:44 Forwarding from ZL2BX to telemetry.arissattlm.org frame type E 2011/08/12-20:36:50 Received telemetry frame with MET=1589 Len=371 2011/08/12-20:36:50 Forwarding from ZL2BX to telemetry.arissattlm.org frame type T 2011/08/12-20:36:58 Received Kursk frame 1 with MET=944 len=516. Do we have C:\\ARISSatTLM\Kursk\KURSK-944.1? 2011/08/12-20:36:58 Yes. C:\ARISSatTLM\Kursk\KURSK-944.1 exists. 2011/08/12-20:36:58 Forwarding from ZL2BX to telemetry.arissattlm.org frame type E 73 Alan ZL2BX -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Ben Bishop Sent: Wednesday, 17 August 2011 14:36 To: AMSAT Cc: n...@lavabit.com Subject: [amsat-bb] Re:ARISSat-1 – telemetry top submitters G'day Jerry, I don't think there's anything wrong with your ARISSatTLM, as I've only been getting KURSK-944s since the 13th. My last 'proper good' experiment frame was: 2011/08/11-08:12:48 Received Kursk frame 2 with MET=650105 len=516. Satellite MET around then was: 2011/08/11-08:12:54 Received telemetry frame with MET=653412 Len=371 I missed the 12th, and on the 13th the telemetry and experiment MET had reset: 2011/08/13-04:34:16 Received telemetry frame with MET=2514 Len=371 . 2011/08/13-04:34:24 Received Kursk frame 3 with MET=944 len=516. Do we have C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.3? 2011/08/13-04:34:24 No. Saving to C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.3. And from that point on, I have only received KURSK-944 frames (which are still auto-forwarding). 2011/08/17-05:30:04 Received Kursk frame 5 with MET=944 len=48. Do we have C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.5? 2011/08/17-05:30:04 Yes. C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.5 exists. 73, Ben VK2FBRB On Wed, Aug 17, 2011 at 11:08 PM, n...@lavabit.com wrote: A question for all, for a few days now my ARISSatTLM has been reporting the Kursk as being (I believe, I'm not at home to check right now) something like Kursk-944.x or perhaps it was Kursk-444.x (some real low perhaps hung up on that and needs a restart? Anyone else, what are the latest Kursk frames that you are seeing? ___ 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 - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1392 / Virus Database: 1520/3840 - Release Date: 08/17/11 ___ 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 - No virus found in this message. Checked by AVG - www.avg.com
[amsat-bb] Re: Turn off AGC when receiving BPSK-1000
I have no option to turn off AGC with the FT-736R. I had been running on the Medium setting (my default) and have switched to Slow now. I'm not sure to say because it's rather subjective just watching, but I think it has slightly improved capture especially at AOS and LOS as well as when I have de-sensing due to my other VHF stations so rudely beaconing their APRS and WL2K info without regard to the science going on! ;-) Jerry N0JY On 8/17/2011 6:24 PM, Alan Cresswell wrote: Hi Mark, Phil, That's interesting. I have collected all my passes on the TS2000 with the AGC on and set to the longest setting. This is mainly because I often record the signal level every 0.5 seconds during a pass which requires the AGC to be on and the longest setting irons out any short fades. I will turn the AGC off and look at the statistics over a few passes but given that with the AGC on I get almost all the available frames I don't expect to see much difference. It will be interesting to see. 73 Alan ZL2BX __ Information from ESET NOD32 Antivirus, version of virus signature database 6386 (20110817) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ___ 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
[amsat-bb] Us Vi
Hi all..a last minute work trip has placed me in St Thomas, us virgin islands for the next 2 days. No arrow but I have the handheld and was on the 2pm pass of ao27. Will try to be on some of the high angle passes of 27, so50 and echo time permitting. Anyone know the grid sqr here? John WP2/VA3BL Sent wirelessly from my BlackBerry device on the Bell network. Envoyé sans fil par mon terminal mobile BlackBerry sur le réseau de Bell. ___ 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
[amsat-bb] Re: ARISSat-1 telemetry top submitters
Alan, I noted that yesterday as well. 73 Colin. -Original Message- From: Alan Cresswell [mailto:alancressw...@xtra.co.nz] Sent: Thursday, 18 August 2011 11:16 To: 'Colin Hurst'; 'Ben Bishop'; 'AMSAT' Subject: RE: [amsat-bb] Re: ARISSat-1 telemetry top submitters Hi Colin, Yes, the other interesting thing is that recently ARISsat has been coming out of eclipse not too long before the start of my morning passes. On those occasions I have received anything up to 19 consecutive data frames (or about 3 minutes) before I receive the first Kursk frame. 73 Alan ZL2BX -Original Message- From: Colin Hurst [mailto:cjhu...@bigpond.net.au] Sent: Thursday, 18 August 2011 01:21 To: 'Alan Cresswell'; 'Ben Bishop'; 'AMSAT' Subject: RE: [amsat-bb] Re: ARISSat-1 telemetry top submitters Alan, The last KURSK segment I received were 741858 on the 12th August. My educated guess is that because ARISSAT1 is resetting during every eclipse the KURSK experiment is not able to obtain the MET and use it as a file name. Hence it is defaulting to 944. 73 Colin VK5HI -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Alan Cresswell Sent: Thursday, 18 August 2011 05:49 To: 'Ben Bishop'; 'AMSAT' Subject: [amsat-bb] Re: ARISSat-1 telemetry top submitters Hi all, According to my logs the last Kursk frame I received on the 0405UT pass on 12 August was 720206. The first Kursk frame on the 12 August 2035UT pass was 944. The interesting thing was that it apparently treated this as a valid frame. i.e it accumulated and combined all five parts. All Kursk frames from that point onward have been treated as exists and ignored. 2011/08/12-20:36:44 Received Kursk frame 5 with MET=944 len=48. Do we have C:\ARISSatTLM\Kursk\KURSK-944.5? 2011/08/12-20:36:44 No. Saving to C:\ARISSatTLM\Kursk\KURSK-944.5. 2011/08/12-20:36:44 Checking for all five parts. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.1: OK. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.2: OK. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.3: OK. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.4: OK. 2011/08/12-20:36:44 C:\ARISSatTLM\Kursk\KURSK-944.5: OK. 2011/08/12-20:36:44 Combining KURSK parts into C:\ARISSatTLM\Kursk\KURSK-944.EXP. 2011/08/12-20:36:44 Done combining. 2011/08/12-20:36:44 Forwarding from ZL2BX to telemetry.arissattlm.org frame type E 2011/08/12-20:36:50 Received telemetry frame with MET=1589 Len=371 2011/08/12-20:36:50 Forwarding from ZL2BX to telemetry.arissattlm.org frame type T 2011/08/12-20:36:58 Received Kursk frame 1 with MET=944 len=516. Do we have C:\\ARISSatTLM\Kursk\KURSK-944.1? 2011/08/12-20:36:58 Yes. C:\ARISSatTLM\Kursk\KURSK-944.1 exists. 2011/08/12-20:36:58 Forwarding from ZL2BX to telemetry.arissattlm.org frame type E 73 Alan ZL2BX -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Ben Bishop Sent: Wednesday, 17 August 2011 14:36 To: AMSAT Cc: n...@lavabit.com Subject: [amsat-bb] Re:ARISSat-1 – telemetry top submitters G'day Jerry, I don't think there's anything wrong with your ARISSatTLM, as I've only been getting KURSK-944s since the 13th. My last 'proper good' experiment frame was: 2011/08/11-08:12:48 Received Kursk frame 2 with MET=650105 len=516. Satellite MET around then was: 2011/08/11-08:12:54 Received telemetry frame with MET=653412 Len=371 I missed the 12th, and on the 13th the telemetry and experiment MET had reset: 2011/08/13-04:34:16 Received telemetry frame with MET=2514 Len=371 . 2011/08/13-04:34:24 Received Kursk frame 3 with MET=944 len=516. Do we have C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.3? 2011/08/13-04:34:24 No. Saving to C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.3. And from that point on, I have only received KURSK-944 frames (which are still auto-forwarding). 2011/08/17-05:30:04 Received Kursk frame 5 with MET=944 len=48. Do we have C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.5? 2011/08/17-05:30:04 Yes. C:\Users\Ben\Desktop\ARISSatTLM\Kursk\KURSK-944.5 exists. 73, Ben VK2FBRB On Wed, Aug 17, 2011 at 11:08 PM, n...@lavabit.com wrote: A question for all, for a few days now my ARISSatTLM has been reporting the Kursk as being (I believe, I'm not at home to check right now) something like Kursk-944.x or perhaps it was Kursk-444.x (some real low perhaps hung up on that and needs a restart? Anyone else, what are the latest Kursk frames that you are seeing? ___ 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 - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1392 / Virus Database: 1520/3840 - Release Date: 08/17/11 ___ Sent via
[amsat-bb] Re: Us Vi
Well, first of all, your job sucks HI HI .. The grid square is FK78. Hope to hear you on the 10:18 UTC pass of AO-51. 73 Mike K5TRI On 8/17/2011 8:56 PM, newsrad...@gmail.com wrote: Hi all..a last minute work trip has placed me in St Thomas, us virgin islands for the next 2 days. No arrow but I have the handheld and was on the 2pm pass of ao27. Will try to be on some of the high angle passes of 27, so50 and echo time permitting. Anyone know the grid sqr here? John WP2/VA3BL Sent wirelessly from my BlackBerry device on the Bell network. Envoyé sans fil par mon terminal mobile BlackBerry sur le réseau de Bell. ___ 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
[amsat-bb] Re: Turn off AGC when receiving BPSK-1000
On 8/17/11 4:24 PM, Alan Cresswell wrote: That's interesting. I have collected all my passes on the TS2000 with the AGC on and set to the longest setting. This is mainly because I often record the signal level every 0.5 seconds during a pass which requires the AGC to be on and the longest setting irons out any short fades. The main thing is that the gain remain constant, or nearly so, during each fade so that the random series of 0's and 1's produced during the fade on thermal noise is mostly seen as 'weak' 0's and 'weak' 1's. Increasing the gain during a fade makes those random bits seem stronger and more certain when they're still just random bits. That can make it harder for the Viterbi decoder to correct them as errors. A Viterbi decoder works much like a network routing algorithm that looks for the cheapest path to a destination. It finds the best path through a 'trellis', a pattern of links corresponding to all possible state transitions in the convolutional encoder that produced the transmitted signal. Out of every possible path the decoder finds the one that most closely matches the received sequence and declares it as the one that was most likely sent. It can still be wrong, and when it does it usually emits a burst of several dozen errors until the decoder gets back on the right path. In BPSK-1000, this error burst causes the HDLC decoder to abort the current frame or discard it with a CRC error. The Viterbi decoder tallies up the 'cost' of each link in a path to find its total 'path cost'. If a particular link assumes that a '0' was sent, then receiving a strong '0' is the best possible match so that results in the lowest possible cost for that link. A weak '0' gives a greater cost, a weak '1' an even greater cost, and a strong '1' gives the highest possible cost. Even if one link in a path has a high cost, the complete path will still be chosen as the winner if all the other paths are worse. When this happens, typically all the other links in the path will closely match the received sequence. So you really want to avoid classifying bits as 'strong' when you know the signal is gone and the bits can't possibly be right. That means not boosting the gain (and the noise level) during a fade. The noise level should be kept constant. -Phil ___ 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
[amsat-bb] South Texas Grid-peditions LotW
I've attempted to reconcile recent Texas grid-peditions in Logbook of the World. This includes my operations in EM01, EM02, EM03, EM04, EM10, EM11, EM12, EM22, DM94, DM95, DM96, EL29, and EL39. If you are waiting on a QSL via LotW and you don't see it, send me the QSO data and I will check to see that I uploaded our contact from the right location in TQSL. August 22-24 I am going to be in the neighborhood of EL07, DL98, DL99, and DM90 in Southwest Texas. My exact operating times are not ironed out but my intentions are to make passes of AO-27, AO-51, and potentially SO-50. As this is a work trip and satellite operations are a secondary task, I cannot confirm the dates and times where I'll make passes just yet. 73 Clayton W5PFG ___ 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
[amsat-bb] Re: ARISSat clock and TLM records
Hi Richard, Don't worry. All of the telemetry data sent to telemetry.arissattlm.org is timestamped with the UTC date and time when the receiving station received the telemetry. All received telemetry is saved to a .CSV file (one CSV file per day) with one line per telemetry frame. Each telemetry frame/line in the .CSV file is also timestamped with the UTC date and time when the receiving station received the telemetry. If you received any telemetry, please email your .CSV files to telemetry (at) arissattlm.org 73, Douglas KA2UPW/5 Richard Ferryman wrote: Now that the ARISSat clock seems to be resetting on a regular basis I am wondering how this will affect the TLM and Kursk data which I am capturing and uploading. It seems to me that the only way of collating the data is by the time of upload to telemetry.arissattlm.org Dick G4BBH ___ 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
[amsat-bb] Re: ARISSat-1 telemetry top submitters
All these data are based on the STP telemetry files from the AMSAT-FTP server (Kursk / Spacecraft). Every telemetry frame exist only once. If 10 stations listen to ARISSat and every station is forwarding the telemetry to the server - only one packet wins. Actually, the telemetry on the AMSAT-FTP server represents all of the frames that the ARISSatTLM telemetry server received from all of the ARISSatTLM users. Duplicate telemetry frames have not been removed. This is all of the raw data. Douglas KA2UPW/5 ___ 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
