- AMSAT-BB - mailman.amsat.org

TALK on P3E from Continent to Continent
by i8cvs 26 Aug '06

26 Aug '06

Congratulations to AMSAT-DL for the new page dedicated to P3E http://www.p3e-satellite.org/ 73" de i8CVS Domenico

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Re: STS-121 / STS-115
by Félim Doyle M3HIM 26 Aug '06

26 Aug '06

I guess you know by now that Enzo meant non-amateur up-/down-link frequencies. I think that Trevor M5AKA and others (me!) have posted some suggestions. However, as an insider perhaps you could publish a definitive list of good places to listen during launch and docking. See also www.dxtuners.com where the local Florida nodes tune in to launch frequencies. 73 de Félim M3HIM IO91ot Aylesbury, Buckinghamshire, UK ----- Original Message ----- From: "Ransom, Kenneth G. (JSC-OC)[BAR]" <kenneth.g.ransom(a)nasa.gov> To: "Vincenzo Mone" <vimone(a)alice.it>; "Amsat - BBs" <amsat-bb(a)amsat.org> Sent: Wednesday, July 05, 2006 6:58 PM Subject: RE: [amsat-bb] STS-121 > STS-121 does not have any amateur radio gear on board. > > > Kenneth - N5VHO > > -----Original Message----- > From: owner-AMSAT-BB(a)amsat.org [mailto:[email protected]] On > Behalf Of Vincenzo Mone > Sent: Wednesday, July 05, 2006 12:07 PM > To: Amsat - BBs > Subject: [amsat-bb] STS-121 > > Hi to the list, > pleas which are the up/downlink frequencies for the STS-121? > Thanks > > 73 de Enzo IK8OZV > EasyLog 5 BetaTester > EasyLog PDA BetaTester > WinBollet BetaTester > D.C.I. CheckPoint Regione Campania > Skype: ik8ozv8520 > > > > > *************************************** > > ***** GSM +39 338 9749786 ***** > ***** SMS +39 338 9749786 ***** > ***** FAX +39 328 7244294 ***** > *** 2nd e-mail: vimone(a)tin.it *** > *************************************** > ---- > 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! > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo(a)amsat.org > ---- > 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! > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo(a)amsat.org

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Re: Helical antennae for VHF, UHF & Microwave
by WILLIAMS MICHAEL 26 Aug '06

26 Aug '06

Felim, Here are some helix info websites. 1.http://www.qsl.net/ve3cvg/antennas/ Good antenna website plus 2400 MHz helix. 2.http://www3.sympatico.ca/b.zauhar/ A lot of info on this page with 2400 and 435 MHz helix projects. 3.http://www.g6lvb.com/index.htm Great site! Check out quadruple helix for AO40. 4.http://members.aol.com/k5oe/ Jerry's site has a lot of useful helix data. Check out the helix projects by clicking the home brew page at left bottom. 5.http://www.electric-web.org/2m_helix_antenna.htm VK5ZAI's 2 meter helix 6.http://webpages.charter.net/n4wyk/ Click satellite website then click 2401 MHz helix at left. 7. The 2006 ARRL Handbook has a excellent "L" band helix project. If I can be of any further assistance, please email. 73, Mike K9QHO AMSAT 33589

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Re: AMSAT-BB Digest, Vol 1, Issue 24
by Ellis 26 Aug '06

26 Aug '06

Hmmm. What happened to the ECHO voltages on 13 August? see http://www.coloradosatellite.net/echo/graph.php There were three 'excursions'. This may have already been discussed to death, but I can't see anything obvious in the list messages. Peter VK1KEP Date: Fri, 25 Aug 2006 14:01:54 -0400 From: "Bobby Lacey" <amsat(a)duaneallman.net> Subject: [amsat-bb] Re: ECHO To: <amsat-bb(a)amsat.org> Message-ID: <00c901c6c870$97d181a0$0e00000a@rosehill> Content-Type: text/plain; charset="us-ascii" Patrick, Have you checked out http://www.coloradosatellite.net/echo/graph.php ? 73 Bobby - KF4GTA EM80 http://www.bobbylacey.com/KF4GTA

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Re: ECHO
by Armour, Randy (ITS) 26 Aug '06

26 Aug '06

I think the database is already available... see recent post from Bobby - KF4GTA. Have you checked out http://www.coloradosatellite.net/echo/graph.php 73 Bobby - KF4GTA However, there seem to be only a few records in the database. We have 10 records in July and 6 records in August. I am not sure if older records in the database are deleted on a frequent basis. Or, maybe nobody is taking the time to upload telemetry data. Randy - KI4LMR -----Original Message----- From: amsat-bb-bounces(a)amsat.org [mailto:[email protected]] On Behalf Of Patrick Green Sent: Friday, August 25, 2006 2:09 PM To: amsat-bb(a)amsat.org Subject: [amsat-bb] Re: ECHO Perhaps the TLM data could be dropped into a central database such how APRS data is into APRS-IS/findu. This could give fancy reporting and alert command stations that aren't near their stations to perhaps look at the next pass of TLM, etc if there is an issue. Just an idea. 73 de Pat --- KA9SCF Amsat #35741 On 8/25/06, Andrew Glasbrenner <glasbrenner(a)mindspring.com> wrote: > > How about copying the telemetry yourself instead of asking someone else to > do it for you. It's there whenever the digital transmitter is, and you can > download software for free to decode it. > > 73, Drew KO4MA > _______________________________________________ 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

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More on GPS time (was Re: Accuracy?)
by George Henry 25 Aug '06

25 Aug '06

According to the US Naval Observatory web site and gpsinformation.net, the leap second offset is contained in the NAV message sent every 12.5 minutes, along with 2 correction values (time difference and rate of system time change referenced to the USNO master clock), allowing most current generation time receivers and software to calculate UTC to within better than 40 nanoseconds of the master clock. GPS time itself is automatically "steered" to USNO UTC on a daily basis to keep system time within 1 microsecond, but has generally been "within a few hundred nanoseconds" over the last several years, since selective availability was turned off. No doubt this is how my Motorola Oncore software supplies accurate UTC time info. George, KA3HSW >-----Original Message----- >>From: Ray McKnight <shortsheep(a)worldnet.att.net> >>Sent: Aug 25, 2006 1:16 AM >>To: George Henry <ka3hsw(a)earthlink.net> >>Subject: Re: [amsat-bb] Re: Accuracy? >> >>You are aware that GPS time and "earth" time are two different critters? >>The GPS constellation is not adjusted for leap seconds, so the time your >>GPS receiver displays is something like 13-14 seconds off actual earth time. >> >>Could make for some big problems trying to track a highly eliptical orbit >>or even LEO with that much error.

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REMINDER
by MARTHA SARAGOVITZ 25 Aug '06

25 Aug '06

This is a reminder that the AMSAT Office will be closed from Monday, August 28th - Friday, September 8th. I will back in the office September 11th. Here is my last nag for two weeks: 1. Send in your AMSAT Ballot 2. Register for the AMSAT Space Symposium 73- Martha

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Scott Sanford to address AMSAT Symposium Attendees
by Emily Clarke 25 Aug '06

25 Aug '06

AMSAT is very pleased to announced that Dr. Scott Sanford, NASA Principle Investigator and co-director of the NASA Ames Astrochemistry Laboratory, has accepted our invitation to provide a key presentation during our tour of the Ames Exploration Center. Dr. Sanford will speak on about sample return from comets and asteroids in general and specifically about the Stardust Sample and Return Mission to Comet Wild 2. Dr. Sanford was one of the original team members to propose capturing dust from a comet and bringing it back to Earth. Stardust was launched in February 1999, and in January 2004 approached Wild 2 within 150 miles of the nucleus, collecting samples and capturing detailed imagery of the comet's surface. On January 15th 2006 Stardust re-entered the Earth's atmosphere and successfully completed it's mission after landing in the salt flats of northwestern Utah. For Dr. Sanford, the investigation is just beginning as he and a team of 180 other scientists are hard at work to analyze the Stardust samples. This team will likely spend years unlocking secrets from the samples. Their efforts will lead to a better understanding about the formation of our solar system and perhaps even the origin of life on Earth and elsewhere in the Solar System. So be sure to join us Sunday afternoon for what promises to be an exciting event. There is no charge for visiting the Ames Exploration Center or attending Dr. Sanford's presentation. Round trip bus transportation from the Symposium Venue to Ames is available and costs $14. You can register for the bus online through the AMSAT store. The 2006 Space Symposium will be a joint meeting with the ARISS International Delegates and will also include the IARU Satellite Advisory Panel annual meeting, and a meeting of AMSAT International Delegates. For additional information please visit the AMSAT website at http://www.amsat.org. Click on the 2006 Space Symposium link in the left side menu. This year you can register for the Space Symposium online. Online Registration can be found at http://www.amsat-na.com/symposium 73, Emily Clarke, N1DID Symposium Chair --------------------------------- N1DID formerly W0EEC - CM87tm Donate to AMSAT at http://www.amsat-na.com/donation.php Support Project OSCAR - http://www.projectoscar.net Personal Website - http://www.PlanetEmily.com

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Discussion regarding AO-51 power
by Bruce Robertson 25 Aug '06

25 Aug '06

Gang: I think we all know how Pat fells, trying to work out what is going wrong with a set-up, wondering if the power has somehow dropped in the transmitter, since its one variable we can't nail down. Someone in that situation might not be properly equiped to download telemetry, especially since receiving poorly is the original problem! That said, I think the team managing Echo are busy enough, and they do an excellent job reporting and calendaring mode changes. It isn't reasonable to ask them to log the output power in real time. Notice, however, that this email list provided the answer to Pat's question very quickly. I imagine anyone who asked such a question here could reasonably hope that some kind soul would answer within a day. I think it would be best expressed as a request for a favour, in any case. Finally, I should mention again that the book on AO-51 at the amsat store is an excellent read and invaluable reference regarding the details of this wonderful satellite. 73, Bruce VE9QRP

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Re: Accuracy?
by George Henry 25 Aug '06

25 Aug '06

With the Motorola Oncore software I am using, I have found the reported time to exactly match WWV. I assume that the software takes leap seconds into account, though I have not checked the documentation. A friend who works at Motorola did the initial set-up -----Original Message----- >From: Ray McKnight <shortsheep(a)worldnet.att.net> >Sent: Aug 25, 2006 1:16 AM >To: George Henry <ka3hsw(a)earthlink.net> >Subject: Re: [amsat-bb] Re: Accuracy? > >You are aware that GPS time and "earth" time are two different critters? >The GPS constellation is not adjusted for leap seconds, so the time your >GPS receiver displays is something like 13-14 seconds off actual earth time. > >Could make for some big problems trying to track a highly eliptical orbit >or even LEO with that much error. > >----- Original Message ----- >From: "George Henry" <ka3hsw(a)earthlink.net> >To: "amsat bb" <amsat-bb(a)amsat.org> >Sent: Thursday, August 24, 2006 21:27 >Subject: [amsat-bb] Re: Accuracy? > > >> It depends on the level of automation of your station... if you are using >> fixed antennas, you only need enough accuracy to know when the satellite >is >> in view. If you are using rotor control, it depends on the beamwidth of >> your antennas ( the narrower the beamwidth, the more critical the aiming >> becomes). If you are using doppler control, then very high accuracy is >> needed: a few seconds of error can translate to several hundred hertz of >> doppler shift on a high pass. >> >> I have my XP machines set to check an internet NTP server every 4 hours. >> For Field Day, I use a GPS receiver to keep the PC clock dead on, and >always >> use GPS to set my station coordinates accurately when portable. And when >in >> doubt, I update my keps right before operating, and at least once a week >> otherwise. >> >> George, KA3HSW

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