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DaNzA
Sep 11, 2001

:D


Grimey Drawer

1W is the legal limit for unlicensed 2.4Ghz band in the US

quote:

In the 2.4 GHz to 2.4835 GHz band, the maximum peak output power is limited to 1 W. If the transmit antenna has a directional gain of greater than 6 dBi, the transmitter power must be reduced by the amount in decibels that the antenna gain is greater than 6 dBi. This does not hold for point-to-point systems, however. For point-to-point systems, the peak output power must be reduced by only 1 dB for every 3 dB that the antenna gain exceeds 6 dBi.

and for 5Ghz

quote:

There are now four bands in 5 GHz channelized for 802.11 in the US, although they're numbered somewhat strangely. In brief, there is total of 555 MHz across 23 channels in 802.11a/n. The lower four are indoor only; the higher 19 are indoor/outdoor. The lowest four (5.15 to 5.25 GHz) can have 50 mW of output power, the next four (5.25 GHz to 5.35 GHz), 250 mW; the next 11 (5.47 to 5.725 GHz), 250 mW; and the top four (5.725 to 5.825 GHz) up to 1 W. (There are further restrictions on 5.25 GHz to 5.725 GHz in terms of detecting and avoiding stepping on military radar transmissions, which share those bands. And the 802.11a spec specifies 40 mW/200 mW/800 mW instead of 50, 250, and 1,000, just to make it even more complicated.)

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