Qualcomm Incorporated (QCOM) Message Board

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Technology Stocks : Qualcomm Incorporated (QCOM)

QCOM 174.35

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3:59 PM EST

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To: straight life who wrote (23693)	3/3/1999 10:15:00 AM
From: engineer	Read Replies (2) of 152472

the RF characteristics of TDMA is such that it is a fixed signal at 700 mW, constant carrier mode. The CDMa phone ranges from 200 mW max power to less than 1 micro Watt close to the cell. The actual stuff falls off at about r**4, which means it gets lower by the radius to the 4th power. Some practical numbers....if the cell radius were say 10 miles and the max power at the edge were 200 mW, then by the time you get to 7 miles, it would be less than 100mW, by the time you get to 5 miles it is less than 10mW, and by the time you get to 2 miles, it runs at about 10 micro watts. From there on in the power will reach 1 uW fast. So if you were always less than half the distance to the cell site, the ratio of the CDMA average and the TDMA would be like 700/7 or about 100 times lower power, thus the .75% may be close. At full range it is like 28%, at close in it is like .000143%. If you wanted real close numbers set this up in excel and calculate it and plot it at various distances.

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