Are you experiencing difficulty finding check gear to function properly? Do you have uncommon issues with power regulators? Do you have unwelcome music superimposed on your own signs? Have you got a higher level of unexplainable hand-offs, dropped calls or other items occurring from a unique cell website?The phenomena defined above are but a few of the apparent symptoms of unwelcome RF signal ingress into cellular telephone systems. These generally arise at cell or changing internet sites near broadcast or other large energy RF installations, actually a few miles away.As mobile operators grow their systems in MSA's and build new techniques in RSA's, they are obtaining raising problem in obtaining authority to build new systems wherever needed. Often the only path to locate a mobile website in a particular place is to share an existing tower which will be currently being used by more than one other transmitters. Alternately, the mobile driver may be expected to identify a new tower in a current antenna "farm ".
In either case there's a definite chance that high RF signal degrees will soon be within the quick location of the cellular equipment. In some places, surrounding area strength levels can even exceed OSHA limits and present workers hazards!What's the clear answer to these problems? The clear answer is actually to "enclose" the cellular gear in a "package" which blocks all RF signs, maintaining other signals out from the "package" and limiting the cellular signals within the "field ".
As a practical matter, a great protecting "field" is neither achievable nor economically desirable. There should often be penetrations of the shield for aerial indication lines, principal energy, telephone lines, gates, grounding cords, air conditioners, water and sewer pipes, etc. The secret is always to restrict passing through these penetrations in order that undesired RF signs which enter the shielded place are completely small to trigger no injury to useful equipment installations.
In real life, many protecting wants can be met by progressive applications of sophisticated architectural shielding materials. Applying such things as fiber attenuation composites, finish suspensions, and more traditional techniques, attenuations of 40 dB or more can commonly be acquired in current buildings. Whilst not to "CIA" requirements, such attenuations will usually be sufficient to make certain no ingress into your equipment.In addition to protecting your expense in high priced gear, reducing preservation costs, and increasing stability and customer satisfaction, architectural protecting can protect your personnel from perhaps dangerous contact with high RF signal degrees, and might just produce the difference in the viability of a mobile site.
Control of RF ingress issues starts with site selection. A cautious study, including area strength dimensions where required, must be made to identify present and potential hazards. This is tricky, since the "world" of high power RF is generally perhaps not common to site order people, or to area mobile engineers. Even the purchase of significant FCC data might be difficult.
True abatement proceeds from 1 ) avoidance or 2) appropriate style based upon information taken in the site selection process. Obviously, at existing sites, diagnostic dimensions must be used, plus a repository examine to characterize the specific and future environment. Using this knowledge, shielding techniques are selected and, with the architectural or developing custom, incorporated into construction planning. Oftentimes, it might be essential to change common electronics styles to ensure that not just today's installations, but potential expansion can remain RF-free.