FCC,Part,important,points,you, communication FCC Part 15 –5 important points you need to know for Spread

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Normal 0 false false false EN-CA X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable{mso-style-name:"Table Normal";mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-style-noshow:yes;mso-style-priority:99;mso-style-qformat:yes;mso-style-parent:"";mso-padding-alt:0cm 5.4pt 0cm 5.4pt;mso-para-margin-top:0cm;mso-para-margin-right:0cm;mso-para-margin-bottom:10.0pt;mso-para-margin-left:0cm;line-height:115%;mso-pagination:widow-orphan;font-size:11.0pt;font-family:"Calibri","sans-serif";mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-fareast-language:EN-US;}Spread-spectrum radiocommunications, long a favourite technology of the military, is in the midst ofexplosive commercial development. Driving cost down has always been a top goal ofany wireless system designer. The following paragraphs detail the FCC rules andexpand on the options available to the system operator or integrator.Where does Part 15 fit into SCADA?The Code of FederalRegulations (CFR), the codification of the general and permanent rules andregulations published in the Federal Register, is divided into 50 titles thatrepresent broad areas subject to Federal regulation. Title 47 of the CFRaddresses Telecommunications and is administered by the Federal CommunicationsCommission (FCC). One of the most commonly referenced parts of Title 47 is Part15, which covers the regulations under which an intentional, unintentional, orincidental radiator that can be operated without an individual license. Thiscovers as well the technical specifications, administrative requirements andother conditions relating to the marketing of FCC 15 devices.  FCC Part 15 Subpart C governsintentional radiators. The various types of intentional radiators covered bySubpart C include cordless telephones, remote control and alarm transmitters,and spread-spectrum systems forwideband data transmission. Intentional radiators governed by Part 15 FCC musteither incorporate a permanently attached antenna or provide a unique couplerto prevent the use of un-authorized antennas. The FCC rules foroperation of radio transmitters are, for the most part, very detailed regardingfundamental field strength, power and/or power density, frequency accuracy, andpermitted harmonic and spurious emissions.  Part 15 FCC regulations emphasize that the Part15 device manufacturer must design a system that will not cause interference with,and be able to tolerate, the noisy primary users of the band.   This is where spread spectrum systems excelbecause of their low noise transmissions and ability to operate in an adverseenvironment. The responsibility for resolving any harmful interference to radioservices that might occur from their use lies with the operator of thosedevices. How to  choose an external antennaFCC regulations dictate that effectiveisotropic radiated power (EIRP) at transmitters cannot exceed 36dBm per systemwhen using a 1 Watt radio, based on a 6 dBi antenna.  1 watt transmit power (+30 dBm) plus 6 dBiantenna gives the +36 dBm EIRP limit. More transmit power and less antennagain, or the opposite, is ok as long as you don’t exceed that number. They don’t talk about losses incables, filters or connectors but those must be included. As an example, if youhad 3 dB of losses and a +30 dBm transmitter, then you could use a 9 dBiantenna. If you want a higher gain antenna for more directivity, say 12 dBi,then you need to reduce the transmit power to +27 dBm.For anyone selling spreadspectrum wireless systems, these limitations are a key factor in overall systemdesign.  Key resources include the radiomanufacturer itself; the top manufacturers are quite prepared to makerecommendations for any given application. Path profiles or actual site surveysprovide the best methods for determining appropriate antenna gain values.  For typical oil & gasSCADA applications, the most common choices for remote sites remain unity gainomni-directional, or 8 dBi and 12 dBi yagi (directional) antennas. Typicalmaster omni-directional base station antennas are usually 5 dBi or 8 dBimodels. Good SCADA automation can becomeGREAT when optimized antenna systems are incorporated into the design from thestart. Visit http://wavelinkantenna.comto see what great antenna options Wavelink Antenna Systems can offer you foryour spread spectrum application.   Gary Tootle advises and supports wirelesscommunications professionals throughout USA and Canada at http://wavelinkantenna.com/contact.php