Always remember that 3dB is Half Power in either direction, and the measurements are "Relative".
View the chart below and notice there is another factor of ten (10) hi-lighted in red. This chart will help you understand the back and forth conversions. Some access points show power settings in mW and some show it in dB. It is helpful to memorize the two (2) patterns.
10W = 40dBm = 10,000mW
8W = 39dBm = 8,000mW
4W = 36dBm = 4,000mW
2W = 33dBm = 2,000mW
1W = 30dBm = 1,000mW
800mW = 29dBm 27dBm = 512mW
400mW = 26dBm 24dBm = 256mW
200mW = 23dBm 21dBm = 128mW
100mW = 20dBm 20dBm = 100mW
50mW = 17dBm 18dBm = 64mW
25mW = 14dBm 15dBm = 32mW
12.5mW = 11dBm 12dBm = 16mW
10mW = 10dBm 10dBm = 10mW
6.25mW = 8dBm 9dBm = 8mW
3.125mW = 5dBm 6dBm = 4mW
1.56mW = 2dBm 3dBm = 2mW
1mW = 0dBm 0dBm = 1mW
Brett Hill, CWNE #147
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