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Microcap & Penny Stocks : Globalstar Telecommunications Limited GSAT

GSAT 68.27

+0.7%

3:59 PM EST

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To: djane who wrote (4625)	5/15/1999 2:48:00 AM
From: djane	Read Replies (2) of 29987

Summary of I* system design problems (via I* yahoo thread) Top>Business and Finance>Stocks>Services>Communications Services>IRID (Iridium World Comm. Ltd.) Avoci, problem is I* system design! by: Nomadic_Trader (32/USA) 13196 of 13198 Avoci, You're comments about this "technology is the future" shows that you never even bothered to read single aerospace periodical. Just because Motorola spent your money to throw up the first low earth portable phone constellation that does not mean that this company will be competitive with the upcoming constellations nor does it mean that phone system's quality and price will be acceptable by the consumers. As for Teledesic, you can be sure that Teledesic will learn from Iridium on what not to do. You will find that Teledesic will have a higher orbit -- which many in the aerospace industry consider to be the fatal flaw in the Iridium system design. The extremely low orbit causes: 1) The satellites move across sky far too quickly which causes unnecessary hand-offs from one satellite to another. 2) Low elevation angles (satellite to handset) causing blockages -- including the users head. 3) The handset are too large, which is a result of poor link -- caused by the low elevation angles and blockages (i.e. Avoci's big head). 4) Little or no diversity since the other 65 satellites are almost always over the horizon. 5) Too many satellites which increases launch costs and reoccuring cost (operations costs). 6) Cross links -- a high rate of propellant usage to keep the constellation in the proper relative phase. 7) Traffic capacity is much lower than the upcoming competitors, whereas a higher orbit would allow multiple satellites to be in view and carrying traffic. 8) Satellite life severely limited by both power (batteries) and propellant. Both power and propellant tradeoff are much more forgiving in the higher orbits. High orbits means less eclipses and less earth triaxiality effects. Limited life means spending your $$$$$ to manufacture and lauch replacement satellites. Additionally: There is an extremely high satellite failure. Yes, I admit that every company that makes satellite has failures, but it is extremely uncommon to have failure rate percentage in the double digits. Motorola has learned a very expensive lesson that satellite quality is paramount and it should have had an experienced satellite builder design and build their satellites. Avoci, sorry pal but in the end you will learn that Teledesic will be redesigning their system away from the Iridium "technology of the future". Posted: 05/15/99, 1:39AM EDT as a reply to: Msg 13001 by avoci

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