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To: Jeff Vayda who wrote (4059)4/22/1999 3:21:00 PM
From: Goodboy  Read Replies (1) | Respond to of 29987
 
Staiano just resigned. Iridium is now within months of the restructuring that will wipe out equity and be quite painful for bondholders. This is playing out as expected. Motorola will proclaim at one point that in order to save Iridium, they will have to resturcture. Which really means, in order for Motorola to put in more money, they want to own a lot more equity and salvage their investment. Staiano and the CFO are both gone because the coming bloodbath will make for a lot of unhappy people they promoted this overpriced space experiment to.



To: Jeff Vayda who wrote (4059)4/22/1999 9:43:00 PM
From: CommSatMan  Read Replies (1) | Respond to of 29987
 
A ten year design life at 1440 Km is difficult to achieve because of the effects of radiation on electronic components. There are three phonomena associated with radiation and the Van Allen Belts that effect satellites.

First is something called Single Event Latchup. This is where the radiation breaks down your electronic component and you essentially have a short to ground. This is mitigated by design and by using special processes to manufacture the parts.

Second is something called Single Event Upset. This is where radiation results in a bit error within an electronic component. This is mitigated by design, such as error detection and correction or voting.

Third is total dose and this effects the lifetime of the component. Electronic components exposed to radiation age more rapidly. As a result, they begin to fail. This aspect is mitigated by selecting special screened parts and "hardened components." As you work through the reliability to take you to a 10 year lifetime, you need more redundancy and are more screened parts. This drives up the cost of the satellite.

It is always a cost benefit trade to increasing satellite lifetime. 7 1/2 years is very good and helps defray costs and gives G* an advantage over Iridium. Going to 10 years could eat up that advantage because of the radiation impact.