[amsat-bb] Fwd: Mystery of the Lunar Ionosphere
Hi, While we are on the subject of the Moon and looking back at missions - take a look at the web pages I have forwarded.Should prove quite a talking point in terms of our hobby - ionosphere and radio communications on and around the Moon. Regards Ken Eaton GW1FKY ___ 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: AO-27 Status
The latest Keps I am aware of are those on Celestrak. Simon Brown, HB9DRV http://sdr-radio.com Ten little fingers, Ten tiny toes, The sweetest of smiles And a cute little nose. -Original Message- From: amsat-bb-boun...@amsat.org [mailto:amsat-bb-boun...@amsat.org] On Behalf Of Clint Bradford Sent: 14 November 2011 23:39 To: AMSAT BB Subject: [amsat-bb] AO-27 Status What set of Keplerian data is the most reliable for AO-27? And it seems that the West Coast US south-to-north passes are still up and running ... But is there any better info available - with the http://www.ao27.org/AO27/index.shtml site down? Clint Bradford, K6LCS ___ 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] Apologies: Re my Posting -Mystery of Lunar Ionosphere
Apologies, My posting on the subject should have included details of the address, but as it was forwarded it will perhaps have been filtered. Details are as follows. Ken Eaton GW1FKY NASA Science News for Nov. 14, 2011 How can a world without air have an ionosphere? Somehow the Moon has done it. Lunar researchers have been struggling with the mystery for years, and they may have finally found a solution. FULL STORY at _http://science.nasa.gov/science-news/science-at-nasa/2011/14nov_lunarionosphere/_ (http://science.nasa.gov/science-news/science-at-nasa/2011/14nov_lunarionosphere/) A video version of this story is available at _http://www.youtube.com/watch?v=_zSrP4MacFE_ (http://www.youtube.com/watch?v=_zSrP4MacFE) You are currently subscribed to snglist as: _gw1fky@amsat.org_ (mailto:gw1...@amsat.org) . This is a free service. ___ 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: Fwd: Mystery of the Lunar Ionosphere
Hi, While we are on the subject of the Moon and looking back at missions - take a look at the web pages I have forwarded.Should prove quite a talking point in terms of our hobby - ionosphere and radio communications on and around the Moon. Suddenly ham radio on the moon looks a whole lot more interesting. New propagation experiments to try to characterise the lunar ionosphere's RF properties. Only trouble is getting there. 73 de VK3JED / VK3IRL http://vkradio.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] DO and DO NOT with your RF connectors
Hi All, The following is a very interesting paper coming from GORE-TEX microwave test cables : DO HANDLING STORAGE 1) Keep connectors clean 2) Extend sleeve or connector nut 3) Cap when not in use 4) Store in provided box 5) Unroll any cable loops VISUAL INSPECTION 1) Inspect all connectors-including mates-carefully before every connection 2) Look for metal particles, debris, scratches, dents, loose pins, jammed collects, worn plating, damaged nuts CLEANING 1) First try compressed air only 2) Use pure isopropanol with cotton swabs 3) Clean connector threads 4) Dry with compressed air GAGING 1) Gage all connectors before first use and periodically thereafter 2) Clean and zero the gage before using MAKING CONNECTIONS 1) Align connectors carefully 2) Make preliminary connection lightly 3) Turn connector nut only to tighten 4) If possible, use a torque wrench for final connection 5) Use proper torque 6) Loosen and re-torque periodically 7) Prevent rotation of connector bodies -- DO NOT HANDLING STORAGE 1) Touch mating plane surfaces 2) Set connectors contact-end down 3) Allow free cable end to drop 4) Store loose in drawer 5) Pull out cable loops 6) Use cables to reposition equipment VISUAL INSPECTION 1) Use or connect to a damaged or dirty connector-ever CLEANING 1) Use any abrasives, chlorinated solvents, or lubricants 2) Get isopropanol onto plastic support beads 3) Blow into connectors 4) Tap connectors to remove debris GAGING 1) Use an out-of-spec connector 2) Hold gage by housing-use plunger barrel only MAKING CONNECTIONS 1) Apply bending force to connection 2) Overtighten preliminary connection 3) Connect by rotating the famale 4) Tighten past break point of torque wrench 5) Snap wrench more than once 6) Approach break point rapidly 7) Use an end wrench to tighten 73 de i8CVS Domenico ___ 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 Re-entry Prediction
Hello everybody, I did my guess before the end of the Chicken Little Competition... maybe a little too early to catch the correct date of re-entry. Anyway, I've noticed that your prediction, Mineo, seems to be optimistic towards the date of re-entry. I think that, close to that date, sat's height will decrease much faster than you've predicted thus the re-entry could be sooner than April 9th. I will be pleased to share my prediction with anybody is interested. 73s Fabio IW8QKU/5 Thanks, Mineo. Your work is interesting. If my memory is correct, the prediction shared at the AMSAT Symposium is for April 2012. Your results agree! 73, Mark N8MH At 11:13 AM 11/12/2011 +0900, Mineo Wakita wrote: I calculated and predicted the time of ARISSat-1 Re-entry. http://www.ne.jp/asahi/hamradio/je9pel/arissat5.htm JE9PEL, Mineo Wakita ___ 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: Status on re-activating Prospero
Apologies, Jan! We've now set up a blgo at: blogs.ucl.ac.uk/prospero-satellite It's still in it's infancy, and we need to add backdated information on the project, though it will have all the goings on of the project that we're going to publicise. Again, apologies for the silence. -Rr. PE0SAT wrote: Roger, Can you send us an update? A lot of people have spend time and energie on this and it would nice to hear how it ended? - Did you ever hear prospero? - Was it possible to send commands to prospero? - How was de setup your group used? - Are there some audio-, video clips, picture? - An article on the whole proces of re-activating prospero? - New data on the satellite? - etc, etc. 73 Jan PE0SAT Hi Roger, What became of the attempts to bring Prospero back to life? Can you give us an update? 73 Jan - PE0SAT -- --- Roger J A Duthie PhD Candidate Plasma Group Department of Space Climate Physics UCL, London w: +44(0)1483 204 100 ext 2299 m: +44(0)7938 55 70 44 ___ 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] CO6CBF/p EL91
Hi guys This afternoon (15 Nov) I will do a work travel to EL91. If anyone needs this grid, please drop me an email for a schedule and I will carry my homebrew portable setup. 73! Hector, CO6CBF EL92 *** Genius is one per cent inspiration, and ninety-nine per cent perspiration. -- Thomas A. Edison *** --- Free the Cuban Five! http://www.injusticia.cubaweb.cu/, http://www.antiterroristas.cu/ Participe en Universidad 2012, del 13 al 17 de febrero de 2012. Habana, Cuba. http://www.congresouniversidad.cu/ Consulte la Enciclopedia Colaborativa Cubana: http://www.ecured.cu/ ___ 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 (37772) decay
Greetings, First, thank you Mineo for reading the AMSAT Journal and making several of my papers available on your web site. My AMSAT Journal paper published in the March/April 2011 issue is actually still fairly valid for the scenarios shown in the paper. The solar flux has turned out to be somewhat higher than was used/predicted in the paper. This has caused the atmospheric densities to be higher which results in higher decay rates. When I wrote the paper I had this nagging feeling that stopping the release height scenarios at 370-km was not going to be high enough. We are very fortunate that the ISS was boosted to such a height before release of ARISSat-1 and not after release! There is a valuable lesson, I think, to be made with respect to predicting satellite decay dates far into the future. The future state of the atmosphere, i.e. the atmospheric density that the satellite will pass through is poorly predictable in the long-term, say starting greater than a week or two into the future. Predictions of satellite decay dates months in the future should be evaluated with the understanding that your date of prediction errors may be large. The errors are due to the future uncertainties of the orbital path which grow quickly with time in a prediction. The atmospheric density is not the only source of error. Your orbit model, the integrator, and the accounting of the gravitational and drag forces among others will affect your results. Predictions of satellite decay dates are not do-and-forget. The general process is to make a prediction, get new measured observations of the height in the future, and at some point re-do your prediction when the errors become significant to you. With that all said here is my current prediction using the same tools used in the AMSAT J. paper and produced as of 2011 November 13th. The decay of ARISSat-1 (37772) will happen nominally on 2012 January 30th with a 10% rule-of-thumb error allowance of 18 days around this date. The errors may be larger than the rule-of-thumb indicates! Jim, N8OQ ___ 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] 5 in EM55
Congrats to Leo W7JPI award #41 5 in EM55 WA4HFN Damon em55 for info on this award look me up onqrz.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] p/ from Dm67
Had 24 qso's from DM67 today, Ouray County Colorado about 12,000 feet. It was sunny and a balmy 18 degrees. One of the AO-27 passes was so low I was pointing the Arrow antenna straight down to the ground. QSO's with: AC0RA; N8RO; CO6CBF; XE1AO; W5PFG; KF7MYK; AJ5C; K7TEJ; KG7EZ; K4MOA; KB1RVT; WA3SWJ; NS7Q; KA6SIP; W0DHB; W0PTI; KL7XK; AND AC2GK/VE5. As always, if you need a QSL card for DM67, send me an email and I'll get you one in the mail. SASE not necessary. LoTW logs uploaded showing the correct grid. Jim Adams - K0BAM Delta Colorado Dm68 ___ 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
