January 2008 - AMSAT-BB - mailman.amsat.org

Re: AO-16 signal periodicity
by Mark L. Hammond 26 Jan '08

26 Jan '08

Here's a link to a graph and some audio files; I forgot them on the first send! Sorry. http://www.dk3wn.info/sat/afu/sat_ao16.shtml ________________ Interesting data from Mike DK3WN! Mark N8MH >From: "Mike Rupprecht" <mail(a)mike-rupprecht.de> >To: "'Mark L. Hammond'" <n8mh(a)embarqmail.com> >Subject: AW: AW: AW: AW: AW: Help needed--AO-16 telem >Date: Sat, 26 Jan 2008 16:27:02 +0100 >X-Mailer: Microsoft Office Outlook 12.0 >Thread-Index: AchgKvZ3P6FZ18PKRfSduIgzex5w3AAA8lvg > >Hi Mark, > >yes, I think it's the same situation here in europe. There are some stations >in the south of Europe with big stations and it seems they block the >transponder ... > >There is indeed an interval of 14 seconds, that means 4.28 rpm - right? > >73, Mike > > >-----Ursprüngliche Nachricht----- >Von: Mark L. Hammond [mailto:n8mh@embarqmail.com] >Gesendet: Samstag, 26. Januar 2008 15:52 >An: Mike Rupprecht >Betreff: Re: AW: AW: AW: AW: Help needed--AO-16 telem > >Thanks for the report, Mike! I'm glad you were able to make some contacts >via AO-16. > >The bird is quite busy here in the US, so making a QSO can be challenging >here, too. > >It's NICE to have AO-16 voice pileups on a "dead digital bird" :) > >73, > >Mark N8MH > >At 03:23 PM 1/26/2008 +0100, you wrote: >>Hi Mark, >> >>wow, great signals from AOS till LOS. >> >>Just worked (quite easy) some european stations (I6VMS, TA1D, OT4B and >RK3DXB). It's much QRM over Europe but with some discipline good QSO's are >possible. >> >>Thank you so much for all. >> >>73, Mike >> >> >> >> Mark L. Hammond [N8MH]

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AO-16 signal periodicity
by Mark L. Hammond 26 Jan '08

26 Jan '08

Interesting data from Mike DK3WN! Mark N8MH >X-BINDING: pd02.embarq.synacor.com >X_CMAE_Category: 0,0 Undefined,Undefined >X-CNFS-Analysis: v=1.0 c=1 a=eTZUOTcYMmIA:15 a=8N5pNyA62PUA:10 a=Aza6Yw9YCZ4R+/7toVlBpg==:17 a=kxRU16pYAAAA:8 a=I2cWxC-P83Qs_bLxeIkA:9 a=A3zKyMl3O8P-v7Y0GwoA:7 a=iJP2CJsKPvG24uzA3iAhMztdHWUA:4 a=cvn8laQl214A:10 a=50e4U0PicR4A:10 a=PthV78sun1KT-ggwoAEA:9 a=Jv9cjD3ahT8RivWRcPsqCSrGXB4A:4 a=1Vq_FK4TplAA:10 a=CxA2Utj4LuEA:10 a=jkCuhmbb9PDjgNrtS5MA:9 a=-s-skpXRXbqpOtPb:18 a=bliBVldoaqZXmdE7:18 >X-CM-Score: 0 >X-Scanned-by: Cloudmark Authority Engine >Authentication-Results: spam03.embarq.synacor.com smtp.mail=mail(a)mike-rupprecht.de; spf=unknown >X-RZG-CLASS-ID: mo07 >X-RZG-AUTH: j/gCopV6EOvJkd7l0rsPX3RjtBH0bSjW8tsupzwqwzrbunA3QB/qOO8SEA74nBp5hKxSoIyC >From: "Mike Rupprecht" <mail(a)mike-rupprecht.de> >To: "'Mark L. Hammond'" <n8mh(a)embarqmail.com> >Subject: AW: AW: AW: AW: AW: Help needed--AO-16 telem >Date: Sat, 26 Jan 2008 16:27:02 +0100 >X-Mailer: Microsoft Office Outlook 12.0 >Thread-Index: AchgKvZ3P6FZ18PKRfSduIgzex5w3AAA8lvg > >Hi Mark, > >yes, I think it's the same situation here in europe. There are some stations >in the south of Europe with big stations and it seems they block the >transponder ... > >There is indeed an interval of 14 seconds, that means 4.28 rpm - right? > >73, Mike > > >-----Ursprüngliche Nachricht----- >Von: Mark L. Hammond [mailto:n8mh@embarqmail.com] >Gesendet: Samstag, 26. Januar 2008 15:52 >An: Mike Rupprecht >Betreff: Re: AW: AW: AW: AW: Help needed--AO-16 telem > >Thanks for the report, Mike! I'm glad you were able to make some contacts >via AO-16. > >The bird is quite busy here in the US, so making a QSO can be challenging >here, too. > >It's NICE to have AO-16 voice pileups on a "dead digital bird" :) > >73, > >Mark N8MH > >At 03:23 PM 1/26/2008 +0100, you wrote: >>Hi Mark, >> >>wow, great signals from AOS till LOS. >> >>Just worked (quite easy) some european stations (I6VMS, TA1D, OT4B and >RK3DXB). It's much QRM over Europe but with some discipline good QSO's are >possible. >> >>Thank you so much for all. >> >>73, Mike >> >> >> >> Mark L. Hammond [N8MH]

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(no subject)
by John Hackett 26 Jan '08

26 Jan '08

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ANDE Awards have been mailed
by Henk, PA3GUO 26 Jan '08

26 Jan '08

Dear all, ANDE Awards have been mailed this weekend. Details are available here: http://www.ande-deorbit.com/status.shtml In case you did not sign up yet, there is still a chance to do so: http://www.ande-deorbit.com/submission.shtml Mailing may take a week or so, but you should expect them one of these days in your mailbox ! For those interested, on the website there is the full overview of all telemetry of the final days (incl. the very last one, by JA0CAW). Also all the TLE (kepler sets) since launch: http://www.ande-deorbit.com/ande_all_tle.txt Mike & Henk http://www.ande-deorbit.com

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AO-51 orbital questions
by Greg D. 26 Jan '08

26 Jan '08

Hi folks, I'm writing my monthly newsletter article for our ham club, and thought I'd talk a little about AO-51's recent challenges, experiments, and results. You think you understand this stuff, until you try to explain it to someone else... AO-51, I thought, is in a sun-synchronous polar orbit, right? I thought that sort of orbit is characterized by having the satellite fly over the same point on Earth at about the same time every day. If so, then why do we have periods of eclipse and periods of no eclipse? If it's not sun-synchronous, is it in some other special form of a polar orbit, or just in a polar orbit? And, about the battery temperature. I get the idea of turning on all the transmitters, so that we "radiate" some of that excess power into space in a more useful way - in the form of RF. But, it would seem that the difference is maybe a watt or so, at the most, which doesn't seem all that significant. And since the power amps are never all that efficient, aren't we mostly just moving the point of dissipation from the batteries to the transmitter modules? I can see how this would help the batteries, but how does it help the spacecraft overall? Is this because of how the thermal design was done? And, more to the point of all this power stuff, does the power really need to be dissipated? I mean, you can put a solar cell in the sun, with no load, and it's not going to explode from not having some place to dump it's charge. Is there a need to take a certain amount of power from the solar cells, in order to maintain their own health? Or, is this really due to the design and function of the battery charging circuitry? Finally, I seem to recall that the spacecraft entered the no-eclipse period before the last crash. Is that the right sequence? Any connection between the two events? Thanks for your help, and also to the command team for the latest configuration. Next good pass is tomorrow; time to fire up the old S-and receive system. Greg KO6TH _________________________________________________________________ Connect and share in new ways with Windows Live. http://www.windowslive.com/share.html?ocid=TXT_TAGHM_Wave2_sharelife_012008

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Re: Spoutnik 41-AMSAT-F
by Jean-L. RAULT 26 Jan '08

26 Jan '08

Bob Cutter a écrit : > Is it possible to get a QSL for a contact with > Spoutnik 41? > > I have seen the log on AMSAT-F. > > 73, Bob KI0G Yes Bob, it is. Just send me please your report with a self addressed enveloppe and 2 IRCs to my home address. 73 Jean-Louis F6AGR Former AMSAT-F president

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AO-16 with small stn.
by ANTHONY JAPHA 25 Jan '08

25 Jan '08

Drew asked for reports from portable/small stations using AO-16, so I offer my experience. Just had Qs with VE2AHD and K8ALM on a 17 degree pass here in FN30, New York City. I was inside my apartment (brick building with metal windows) on the 17th floor, with many obstructions outside. Using 2 FT-817s, 5 watts up into 3 el; preamp and 7 el down. This is my portable gear used inside (temp in the 20s today). Can't wait for spring! There may actually be very short windows--1 or 2 minutes--from here to G-land, etc. This looks like a great bird. I love the SSB downlink. Tnx to all who made it happen. 73, Tony, N2UN ANTHONY JAPHA tjjapha(a)earthlink.net EarthLink Revolves Around You.

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QSL Cards with AMSAT Logo
by Clint Bradford 25 Jan '08

25 Jan '08

I have already obtained permission to use our logo...Who has had a great experience with a QSL card maker who will print the AMSAT logo on the card? Clint Bradford, K6LCS / KAF3359 909-241-7666

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AO-51 Mode Change (NEW MODE V/US)
by Andrew Glasbrenner 25 Jan '08

25 Jan '08

This morning, January 25th, AO-51 was switched to a new mode. Currently both the S band downlink of 2401.200 and the 435.300 downlink are on and tied together to the 145.920 receiver. This creates a single repeater that can be heard on either downlink. In the past the satellite power budget would not allow simultaneous S and U downlinks for more than a few moments, but the current no eclipse season allows us try try this new combination. The L/U BBS and U band telemetry will be off during this period, except for brief periods when command stations will be collecting telemetry. During these passes, the S band downlink may be shut off temporarily. Give this new mode a try this weekend. If you like using S-band AND working lots of stations, this mode is for you. Currently we plan to run this mode through the end of the month. 73, Drew KO4MA AMSAT-NA VP Ops

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Re: AO-16 with small stn.
by John Marranca, Jr 25 Jan '08

25 Jan '08

Reid, et al: Yep...the 817 works great! In fact, on the 2120z pass, I worked you with an 817! What is annoying though, is the amount of QRM. Some of it actually sounds intentional. 73 de KB2HSH -- _______________________________ John Marranca, Jr PBX Technician/Shop Steward CWA Local 1122 BN Systems, Inc Orchard Park, NY (716)972-2006

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