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To: engineer who wrote (88193)	11/24/2000 12:02:51 PM
From: marginmike	Read Replies (1) \| Respond to of 152472

sarcasm is wonderfull, but the sky has already fallen for most. The fact that it has paused its fall doesnt mean its time to discard your helmet.

To: engineer who wrote (88193)	11/24/2000 6:08:28 PM
From: Jon Koplik	Read Replies (3) \| Respond to of 152472

5 MHz "channel" / 1.25 MHz "channel" -- okay, once and for all, I would like to see if my understanding of this "slice of electromagnetic spectrum" stuff is indeed correct ... My guess is : the FCC assigns a certain portion of the electromagnetic spectrum to each carrier (e.g. -- Sprint PCS, Verizon, Globalstar, etc.) This portion (or "slice," as I like to call it) has some "width" (or range of wavelengths). The Globalstar literature I picked up at Qualcomm annual meetings had the following information (relating to the Qualcomm GSP 1600 model of Globalstar handset) : Globalstar Reverse link : 1610.73 to 1625.49 MHz Globalstar Forward link : 2484.39 to 2499.15 MHz Cellular Reverse link : 824.01 to 848.97 MHz Cellular Forward link : 869.01 to 893.97 MHz ******************************************** The Globalstar literature I picked up from my (old) Globalstar service provider (GMPCS Personal Communications) had the following information (relating the Globalstar system) : Globalstar : L and S band IS-95 CDMA : 824 - 849 MHZ, 869 - 894 MHz AMPS : 824 - 849 MHz, 869 - 894 MHz GSM : 890 MHz - 915 MHz, 935 - 960 MHz (I assume that the whole numbers are merely the result of someone deciding to "round" the numbers). Questions : 1. Is this "reverse" and "forward" terminology referring to the call coming from, or going to the cell tower (or low Earth orbit satellite) ? 2. Are these various "slices of spectrum" (looks like 25 MHz wide for the various cellular choices, and 15 MHz for Globalstar satellite telephony) -- the place where the carriers have to "fit" their 1.25 MHz or 5 MHz channels ? 3. If this is correct, and spectrum is obviously a limited and valuable resource, why would anyone EVER adopt W-CDMA technology, if it requires 5 MHz, instead of 1.25 MHz ? Jon.