- AMSAT-BB - mailman.amsat.org

break from S band gnashing
by w7lrd＠comcast.net 08 Sep '06

08 Sep '06

Hi I just spent AOS to LOS on AO7 saying CQ to myself. Put the keyboard aside and talk to me. Strong downlink sigs to. 73 Bob W7LRD Seattle

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New software released
by Thierry F6BXM 08 Sep '06

08 Sep '06

Hi A friend, Gabriel F6DQM just release a new version of Sat Explorer program freeware ! http://rivat.chez-alice.fr/software.htm -- 73 de Thierry f6bxm(a)amsat.org

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Eagle modes
by McGrane 08 Sep '06

08 Sep '06

Greetings Happy to have read about the design changes for eagle. Sorry so many people are upset about S band not being there. Wont it be on Phase 3E? I was very impressed that the amsat design team wants to please a large number of users without requiring large investments in ground stations. Better to accommodate as many as possible instead of evryone subsidizing a project for a select few high tech types. I will continue to donate to eagle in the future. Thanks to the design committee, patrick N2OEQ

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Re: S band and Eagle: an appeal for more transparency (was Sband and Eagle: an appeal for a higher level discussion)
by i8cvs 08 Sep '06

08 Sep '06

----- Original Message ----- From: "Stefan Wagener" <stefan_wagener(a)hotmail.com> To: <brobertson(a)mta.ca>; <amsat-bb(a)amsat.org> Sent: Friday, September 08, 2006 1:57 AM Subject: [amsat-bb] S band and Eagle: an appeal for more transparency (was Sband and Eagle: an appeal for a higher level discussion) > The main problem with the whole discussion is that the majority of folks > have NOT seen the data. In addition, if the data are as sound as they are > portrait, why is AMSAT-DL not believing in them and is including S-band as > a downlink. How is the discussion between ANSAT-NA and AMSAT-DL > going on this? > 73, Stefan VE4NSA Hi Stefan, VE4NSA The reverse is true. If the result of the S band as a downlink on AO40 was extremely succesfull why AMSAT-NA is not believing in AMSAT-DL ? The decision of AMSAT-DL to reuse the S band for downlink of P3E is based on already experimented facts using AO40 and there is no question about that. Is someone in condition to demonstrate that the S band of AO40 was a catastrophical affair ? Don't worry about because if P3E will be succesfull in orbit at the end of 2007 than the S band as a downlink will be again the voice of truth. Best 73" de i8CVS Domenico

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BEFORE IT IS READY
by Robert McGwier 08 Sep '06

08 Sep '06

This is released before we are ready. We have much more documentation, analysis, etc. to provide. It will be forthcoming. http://www.amsat.org/amsat-new/eagle/EaglePedia/index.php?title=San_Diego_D… Bob N4HY -- AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman "You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat." - Einstein

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No Mode S on Eagle
by Jim Kelly 08 Sep '06

08 Sep '06

A concerned satellite enthusiast wrote: "it's a horrid >marketing decision. Bad mojo for a organization that lives on the donations >of it's members." I've been around hamsats long enough now (>16 years) to vividly remember how the AMSAT movers and shakers bludgeoned us over Mode B, which we operators desperately wanted as primary on AO-40, but we were told, no, we have to move higher to Mode S. Now that many of us made the investment in Mode S and learned the technology, now that also is into the trash barrell because the techies have determined that it's too noisy. Gentlemen, the point is that the designers and engineers are running the program just as they always have and us users don't count for much except our donations. I'm sorry if this comes off as sour grapes but hell, I've been there, done that. 73, Jim Kelly, KK3K Former member AMSAT #22420 Jim Kelly, ARS KK3K, TCA 99-49842 TINPLATE TIMES http://www.tinplatetimes.com STANDARD GAUGE LIST http://groups.yahoo.com/group/standg Personal Homepage: http://mysite.verizon.net/skeptic491 __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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San Diego meeting notes
by Jim Sanford 08 Sep '06

08 Sep '06

Ladies and gentlemen: The notes and conclusions from the San Diego meeting are now public. Please review carefully, as they explain the rationale for certain design decisions. Further information is contained in the note I sent earlier this evening. 73, Jim wb4gcs(a)amsat.org James A. Sanford, PE Eagle Project Manager

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No mode S on EAgle
by jmfranke 08 Sep '06

08 Sep '06

AMSAT is not a production service, it is a platform for experimentation. Several amateur satellites support or will support S-band operation. I have been with the program long enough (OSCAR III) to have heard the screams about abandoning mode A then mode J. There were lots of arguments against going to S-band, and now the voices are saying please do not abandon S-band. Well S-band is not being abandoned. The proposed new satellite will be pushing us to explore 5.6 GHz. I look forward to the challenge and will still continue to monitor the UHF, L-band, and S-band transmissions from AMSAT-NA, AMSAT-DL, and whoever else has the foresight, volunteers, and resources to orbit these exciting satellites. I vote with my donations (far above and beyond subscriptions), and I have donated to many birds, including Eagle. John WA4WDL #10211

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WI-FI already migrating on 5ghz
by Luc Leblanc VE2DWE 08 Sep '06

08 Sep '06

What they are telling us about 2.4 and 5GHZ wi-fi system in a few minutes searching. It is not rigorously mathematics and statiscally not rigorous but ALL the actual and past commenting forecast a move towards 5 ghz. Wireless phone at 2.4 are at less that 25$ et some manucturers does not produce them anymore! Excerpt from the internet. When vendors began work on 802.11a, they did not want to stay in the 2.4-GHz range used with 802.11b products. The spectrum at 2.4 GHz is a shared frequency, so devices like cordless telephones and microwave ovens can create interference problems. Also, the vendors are able to squeeze out only about five channels -- or simultaneous user connections -- in this range, which relies on direct-sequence spread-spectrum technology, a signaling technique that places a premium on security and reliability while sacrificing efficient use of available bandwidth. Keeping to Themselves In the late 1990s, the Federal Communications Commission Latest News about Federal Communications Commission opened up a new frequency range -- the 5-GHz range -- that is only available for wireless LANs, so there is no outside interference. Also, it uses orthogonal frequency division multiplexing for modulation, which increases bandwidth efficiency so an access point can support about 10 simultaneous connections. By Paul Korzeniowski TechNewsWorld 01/28/04 5:00 AM PT _________________________________________________________________________________ With multiple formats available, Grewe said it's difficult to predict which technologies customers will demand. Multiband components are complicated, requiring two complete radio systems to send data over either frequency, but the result is a chip that works in any wireless system. Grewe expects faster wireless networking systems to take off in late 2003. One scenario calls for a broadband connection to a home media hub, which could distribute TV signals, digital audio, gaming and other entertainment wirelessly throughout the house. With high-definition TV signals requiring nearly 20 Mbps of bandwidth, 802.11b's 11 Mbps won't be fast enough. "We think home multimedia will be a big application (for faster wireless networking systems), but we don't expect to see that really happen until 2004 or 2005," Grewe said. One reason: Need for a 54-Mbps wireless connection hardly exists when today's DSL and cable modem connections rarely pull data at speeds faster than 11 Mbps. "People tend to forget that faster home networking is going to require faster broadband pipes to deliver content to the home," said Kim. But 802.11a offers at least one advantage right now: more radio channels. "Using more channels is like having more lanes on the freeway," said Robert Fan, a representative for Resonext Communications. "It means 802.11a gives you the capacity to support more users at the same time," important on networks in schools, large businesses and public places. By Will Wade| Also by this reporter 02:00 AM Nov, 21, 2002 ___________________________________________________________________________________ Bellanet Sandbox 2004 Higher frequency 5GHz band seems to be a more promising platform for deploying higher speed 54Mbps and up WiFi infrastructure. WiFi equipment in this band incorporates two additional features into the IEEE 802.11a standard (WiFi standard), namely, dynamic channel selection and transmit power control. Dynamic channel selection improves the ability to coexist with other user of the 5GHz bands as devices may select channels based on real-time feedback. Transmit power control is used in selecting lower-powered channel for short-range applications or higher-powered channel for long- range applications. Although, 5GHz band deployment has not been reviewed in this book. The deployment method is fairly similar to the 2.4GHz band. Quite a bit of 5GHz implementation has been done in the developing countries. Some use it as the long-haul backbone infrastructure. In dense area, some use 5GHz WiFi infrastructure for last mile access infrastructure. _________________________________________________________________________________ by Lisa Phifer, VP, Core Competence 20 Feb 2003 Although 802.11a is by no means immune to interference, it's likely to encounter less interference simply because of the 5 GHz frequencies on which it broadcasts. The reason? The 5 GHz band is shared by far fewer devices than the 2.4 GHz band used by 802.11b/g. _________________________________________________________________________________ Why AMSAT should be always 180 degres off phase with the real world...They are not only want us believe they scarp S mode only for technical reasons. If they work in a so close relation with AMSAT-DL folks why they don't convince them to scrap their S band in a way to avoid them costly and fatal errors? "-" The medium is the message...The content is the audience...;) Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe

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Re: S Band Downlink on P3E
by W7TYN 07 Sep '06

07 Sep '06

Well it's time I jumped in on this subject!! I have read the all of the comments concerning the decision to drop a S band downlink on Eagle . It goes without notice that no one from the design team ( or AMSAT BOD ) has denied the rumor. If this reasoning exists please include on this AMSAT-BB. I took the time to read all of the Eaglepedia (which is a great service),( tnx Emily )and I see no reference to a PUBLIC discussion to abandon mode S downlink Going back to V/U modes seems to me taking a step backward to me. I was very active on AO-40 from here in Portland, Oregon. I am located in a urban area next to the High Tech. factories including the very large INTEL operation. I used a Primstar Dish and homebrew patch and had no difficultly working thru the few click present on the band. Please "Google" for AO-40 and look through the amount of information and help the average Amateur Radio satellite uplink builder can find to get on mode S. I will be looking for comments from the BOD or Eagle team that can verbilize for us why a "S-Band downlink" will not sour on our EAGLE . There I feel better...73 Joe D'Arcy W7TYN AMSAT member since 1969 AMSAT #03951

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