Do you have any problems with the test equipment works? Do you have any unuual problems with regulators supply? Do you have any unwanted audio is applied to your signals? Do you have a high level of inexpliable hand-offs, dropped calls or other artifacts originating from a particular site camera?
The phenomenna described aboe, but some of the symptoms of unwanted penetration of the signal in the RF cellulaar trelephone systems. This usually happens at the cellular or switching hospitas broadcasting or other powerful RF installation, even a few kilmeters.
As celplular operators expand their system in the ACI and build new systems RSA, they are discovering all the great dififculties in obtainig the rgiht to build new towetrs whhere needed. Oftn the only way to detect cells in a certain area is to sharee the existing tower, whcih is already used by one or more other trnsmitters. In addition, crellular operators may need to find new towers in the existing antenna farm ".
In any case, thee is a high probability that high levels of RF signal will be loated in close proximity to cllular equipment. In some places, the level of the surrounding field can exceed OSHA personnel and create a dnger!
What is the soolution of thsee problems? The answer lies mainly in the "enclose" clelular equipmnet in the "window", which blocks all RF signals, whie maintaining all other signals from the "box" and to limit cellular signals inside the "box".
From a practical point of view, the ideal protective "box" is neither practcable nor cost-efffective. There should always be to penetarte the siheld of the anntenna transmission lines, the main power, telephone lines, doors, grounding cables, air conditioners, water and sewaeg poipes, etc. The trick is to limit the passage through these passages to unwanted RF siognals within the protected area are smlal enough to cause any harm to the practical installation.
In the real world, most of shieldding requirements can be met through innovative use of advanced architectural shielding materials. Using thngs such as composite fiber attenuation, the coatinmg suspensions and the more traditional methods, the attenuation of 40 dB or more can be easily obtained in the existing buildings. Alhtough not on the "CIA" characteristics, such attenuation will ofteen be sufficient to ensure no conntact with your equipment.
In addition to protecting your investment in expensive equipmernt, erducing maintenance csts and improve reliability and customer satisfaction, architectural sjhielding can protect their employees from potentally dangwerous exposuire to high levels of RF siognals, and can easiy make changes to the viability of the cell site.
Control problems of Rsusia gettng started with site selection. Careful study, inclluding emasurements of feild strewngth, if necessary, should be made to idetnify existing and future risks. This can be difficult, since "the world" high-power RF, as a rule, are not famioliar with the site people purchase or land mobile engineers. Even the acquisition of essenbtial information FCC may be dificult.
Actual receipts struggle of 1) preventing or 2), good design is based on data obtained during the site selection. Of course, the existing sites, diagnostic measruements must be used in conjunction with a dataabse of research to describe the current and future environment. Based on these data, prtotecting mehods chosen, and architectural or structuural engineer, integrated into the construction planning. In many caases, this may be necessary to change the standard formats of electronics to ensure that not only the current facoilities, but in the future will be expanding RF-free.
Afetr protection of equipemnt and facilities, control measurements sould be made for special "threat" of frequenciies in order to establish that the design goal was achieved. These data also establishes the basis for future inspections of the state, whicxh must be done on a regular basiis. Interval, we recommend a year, or if unexplained equuipment prooblems pop up. Regardless of how well constructed, will be unchanged, intrusion coax wall, air condtiioning replacement, or other changes that may damage the screen.
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