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Subject: Re: Globalstar GEOs
Date: Fri, Mar 6, 1998 08:26 EST
From: Readware
Message-id: <19980306132700.IAA04826@ladder02.news.aol.com>
The GEOs would be architectured with the current gateway system, as my post indicated. A VSAT system would offer lower quality call service, which G* would want to avoid. The "lower quality" call is not the market it wants to address-- the lower quality call is why the call is $.15/minute.
As for when these 3-4 GEOs might be expected: I would guess sometime very early in the 3rd qtr of this year the G* shareholder should expect to see an announcement regarding GEO construction/launch plans. Perhaps at the annual shareholder meeting in April shareholders can make inquiry regarding this.
Subject: Re: Readware
Date: Fri, Mar 6, 1998 20:29 EST
From: Readware
Message-id: <19980307012900.UAA11394@ladder02.news.aol.com>
Ka Band does start in the year 2000 for C* on leased transponders. A dedicated full KaBand GEO will be launched two years later. KaBand is a new frequency, and Hughes has been aggressive in its plan to deploy KaBand GEOs.
As regards ViaSat: I have mentioned in the past that the ViaSat DAMA would be of large use to one of the satellite majors, if you recall. Sometimes, however, in these such situations more than alliances (the word you used) are the end result.
Subject: Re: Readware
Date: Fri, Mar 6, 1998 20:32 EST
From: Readware
Message-id: <19980307013301.UAA16394@ladder03.news.aol.com>
Well, you haven't read every one of the posts. On three occasions that I can recall I have mentioned my doctoral work and professional affiliation.
But then again this is a post about satellites, and not about individuals who post on it.
Subject: Re: Globalstar GEOs
Date: Fri, Mar 6, 1998 22:16 EST
From: Readware
Message-id: <19980307031600.WAA29969@ladder02.news.aol.com>
As for the GEO fixed sites, Ajit, the good news for G* shareholders is the both the Indian and Chinese governments have commissioned their buildout. This is to say that commercial interference (PTT shake down" as you call it) from other telecommunications interests are not a concern for G*. The idea for both governments is to set up a 21st century "rest of world" telephony backbone. VSATs do not provide this.
I suppose familiarity with actual China MPT dealings, e.g., is a necessity here to get a better idea of actually what G* is doing in China. Over the course of time we have developed capability for that familiarity. The Ministry of Post wants very much a telephony infrastructure that helps China advance economically, and fortunately for G* shareholders G* is about the only system in the foreseeable future that has the capability to do that. That is
why G* and China are working so well together. G* will have a good lead time on other systems, probably four or five years at the minimum.
Subject: Re: Cyberstar Question
Date: Sun, Mar 8, 1998 14:13 EST
From: Readware
Message-id: <19980308191300.OAA23488@ladder02.news.aol.com>
No-- nothing that was stated at the conference would lead one to believe the numbers you posted should be expected to be materially different than what you posted-- assuming, always of course, that all GEOs are launched in a "timely" manner. The satellites must be in-orbit for the numbers to follow.
Subject: CDMA & Satellite Power
Date: Mon, Mar 9, 1998 08:35 EST
From: Readware
Message-id: <19980309133501.IAA13585@ladder02.news.aol.com>
In answer to the email: satellite power is a scarce commodity since it is finite, obviously. For satellite telephony communications the level of transference must be between 10db to 16db. A 16db margin maintenance puts the satellite at maximum power usage. Iridium's TDMA requires a constant 16db maintenance. CDMA, however, allows the satellite to adjust power, to lower it to 10db and still maintain the same communications quality as 16db. In other
words, CDMA permits G* to operate at a "power on demand" level, and thus conserve greatly on the satellite's power usage.
Iridium's TDMA requires that Iridium assume at all times that there is an interference between the handset and satellite, and thus in order to avoid shadow it must function at a power level issuing a 16db margin, even if that is not required. (There is a larger part of the time no interference between the handset and the satellite). For G*, only when there is interference will the phone call draw down at the 16db level. When there is no interference
between the handset and the satellite (which is the case the majority of the time), CDMA allows the G* satellite to function at a lower power level for those calls, to provide power for the 10db level.
This holds, however, only for the first generation Iridium satellite. The second generation will be operating with CDMA.
Subject: Re: CDMA & Satellite Power
Date: Mon, Mar 9, 1998 09:09 EST
From: Readware
Message-id: <19980309140901.JAA16567@ladder02.news.aol.com>
Yes, TDMA is time allocated, and thus has no multipath diversity capability. TDMA (time division multiple access) has a much narrower capability for telephony in that bandwidth usage must be allocated on a time basis. This requires a far more complex software program than CDMA in processing calls. |
