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July 25th 07, 07:25 PM
posted to comp.sys.laptops,sci.electronics.design,rec.radio.amateur.antenna
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Help with Wifi antenna
gwatts wrote:
Jeff wrote: Note that in almost all places there are legal limitations on EIRP (Effective Incident Radiated Power). In plain English, the more you narrow a signal, the stronger it becomes. Since you did not say where you are, I'll mention the two places I know for sure. In the U.S. WiFi EIRP is limited to 1 watt for mobile/portable use (e.g. laptops) and 4 watts for fixed links. Bear in mind that 2.4GHz is also an amateur band where no erp limits exist!! Only 802.11b/g channels 1-6 fall in the amateur allocation of 2390-2450 MHz. If operating under amateur regulations you must identify by CW, phone, RTTY or TV image every 10 minutes or less (see 47CFR97.119), your transmissions must be intended for reception by another licensed amateur station or station authorized to communicate with amateur stations (see 47CFR97.111), that has to be the only reasonable way to effectively communicate, no other radio service available that accomplishes the same communications (see 47CFR97.113) and you have to use the lowest power level capable of accomplishing the communications (see 47CFR97.313). See http://www.access.gpo.gov/nara/cfr/w...7cfr97_01.html for specific regulations. I forgot to mention amateur communications cannot be encrypted, so no https, see 47CFR97.113 again. |
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