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To: Bux who wrote (9337)	9/8/1999 12:29:00 PM
From: john k. hixon	Read Replies (1) \| Respond to of 10227

Bux, ~~~~~~"Tropospheric ducting can cause radio (and cellular) transmissions to propogate over unusually long distances. This can occur when an atmospheric temperature inversion creates a layer in the atmosphere that acts as a RF mirror. Does anyone know how IS-95 deals with this phenomenon and how that compares to the type of problems that may occur in a TDMA system? For instance, which technology would be more susceptible to interference from this? Also, would cellular or PCS frequencies be more likely to experience tropospheric ducting?"~~~~~~~~~ If you're asking questions like this on the Qualcom board you are not technically savvy enough to compare the advantages or disadvantages of CDMA vs. TDMA as related to revenue. The bottom line is that iDEN is a GSM based network and GSM just happens to be the European standard. Do you have any other trade rag quotes referring to GSM capacity problems? I doubt it. So as to not zing you totally, I'll answer your first question: "Tropospheric ducting is the condition when communications of greater than a few hundred miles occurs. Instead of the wave propagating between the temperature inversion and the ground, the radio wave is between two atmospheric layers thus creating a duct. Distances of 1000s of miles may be experienced, for example between California and Hawaii. The trick is that both stations must be in the atmospheric duct or capable or transmitting into it. This type of propagation is most likely of 50Mhz and 144Mhz. Most likely any extra long communication in the UHF and VHF range can be attributed to tropospheric ducting." In other words, ducting more often impacts HAM radio transmission due to the lower frequency range being utilized. iDEN operates in the 800MHz band. If you've got anything to contribute to the benefit of the board, please continue to do so. I've been a lurker for years and you've been the first to draw me out in a long time. You don't have to agree with everyone, but at least be accurate in your analysis. To your benefit CDMA does have unique advantages over TDMA, but that doesn't make iDEN any less competitive. My suggestion, stick to whatever your strengths are and leave the technology quirks the experts.

To: Bux who wrote (9337)	9/8/1999 1:16:00 PM
From: Arnie Doolittle	Read Replies (1) \| Respond to of 10227

"CDMA has an easy upgrade path to 3G and iDEN does not." It's nice that you can spout the CDMA party line but you forgot one MAJOR detail: 3G is nothing more than vapor ware at this point. No one can even tell you EXACTLY what it is, what it will do and how it will do it. But there are strong rumors that CDMA won't handle data as well as GSM/TDMA. The notion that MOT won't have an iDEN version of 3G is outrageous on its face. If NXTL wasn't confident of its ability to handle data as well as or better than competition, why, pray tell, are they trying to get NextWave's PCS licenses? Hmmmm? Arnie