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To: Jon Koplik who wrote (13505)	8/10/1998 1:50:00 AM
From: straight life	Respond to of 152472

I'll just put in 1 1/2 cents; one frequency characteristic that I can think of that would be germane is that the higher the frequency, the more line-of-sight it becomes, with little bounce or skip. It doesn't go through steel or concrete; the wavelength is much shorter and is easily deflected; which is why AM radio (measured in kilohertz) bounces off the atmosphere and travels much farther than FM radio (measured in megahertz), and why microwave towers must "see" each other.

To: Jon Koplik who wrote (13505)	8/10/1998 11:48:00 AM
From: mrknowitall	Respond to of 152472

It isn't just the carrier frequencies that make it difficult in large buildings, malls, etc. Aside from large amounts of metal (no matter what the frequency, there is some signal degradation) you also have innumerable sources of EMI (ElectroMagnetic Interference) in these kinds of public facilities. The error correction system for CDMA keeps what you hear "clean" even with interference - up to a point, and usually at that point, you won't have service. Depending on your service provider, you will almost always have overload situations in malls, since so many users are concentrated in a single area. It is very difficult for a user to determine if it is interference or simply system overload, especially with digital systems.