CDMA, Qualcomm, [Hong Kong, Korea, LA] THE MARKET TEST! Message Board

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Technology Stocks : CDMA, Qualcomm, [Hong Kong, Korea, LA] THE MARKET TEST!

QCOM 170.90

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Nov 7 9:30 AM EST

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To: Jean B. Roper who wrote (351)	8/4/1996 5:37:00 AM
From: Maurice Winn	of 1819

Hello Jean, Gee, 10 years in a cult. That is almost inner circle. Most cults clean their members out well before that and leave them disillusioned and bankrupt, if not dead. So IDC must be not all bad. Come to think of it, I've been in the CDMA cult for 5 years, but only fully paid up for 2 years. Just how do you think their technology is better than IS95 to the extent that it will be in serious contention? My understanding is that it will mainly make the spectrum useage more efficient. But there is a limit to the usefulness of increased signal per bandwidth efficiency, because handsets would have to be too powerful if the thing was so super efficient for example that only one cellsite could cover a whole city and all its subscribers. There would be dead spots all over the place. And handsets 40 km away would need to blast their signals through trees, houses, and lots of air, etc while decreasing in strength; reducing to quarter its strength every doubling in distance, even without attenuation. A signal 16 km away being a 256th the strength of that at 1 km. Batteries will go flat fast. Say for example, you could make it as wide as you liked. How wide would the bandwidth be? The impression I have is that CDMA is a bit on the narrow side, but not much. I also believe that laws in different countries make it desirable to aim at 20 Mhz bandwidth, and even if that isn't perfect, it is a fact of life that laws get in the way of good sense sometimes. I'd like to hear from somebody more certain about that as I'm guessing? I'm not sure what you mean by B-CDMA being "compatible" with CDMA, TDMA and GSM? You can make dual mode handsets if that's what you mean, but I don't think that's the point you're making. Please elaborate. Thanks Jean and here's to a successful venture for you into the long or short of CDMA. May the best witchcraft win. Maurice

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