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To: CommSatMan who wrote (4273)	4/30/1999 11:41:00 AM
From: John Stichnoth	Respond to of 29986

CommSatMan, That was some great info. A multi-part followup question, if I may: It takes somewhere around 25 dB of link margin to penetrate a building. This is dependent on building construction. The more metal and concrete the more link margin needed to penetrate. Will the signal strength be sufficient (what are the dB levels needed to penetrate?) to allow communication: 1. Through a tempered glass window (eg, those used in office builings where the window can't open). 2. Through standard house windows 3. Through wooden house walls and ceilings? 4. Through the skin of an airplane? (Competition with those ridiculously expensive phone calls on planes?). Just trying to get a handle of the expected limitations of G*'s phones.

To: CommSatMan who wrote (4273)	4/30/1999 11:48:00 PM
From: Clarksterh	Read Replies (3) \| Respond to of 29986

CommSatMan - A follow up to the issue of operation of G* in a building. Since G* is CDMA it has a further constraint that I* does not have. It must control its power. This is probably a non-issue when there is a direct line of sight to a spacecraft and the only fading is Ricean. However in a building, or in an metro alley, the signal path, even if strong enough, will be via multipath and will experience Rayleigh fading which is, of course, more extreme than Ricean. This could drop the signal below the other users, or drown out the other users since the time limit on the power control loop is pretty long. Perhaps you've discussed this before, but in any case I wouldn't count on reliable communication unless there is a direct line of sight, or at least one path that is consistantly significantly stronger than any of the other 'multipaths'. JMO Clark