Higher Energy RF Interference to Cellular Radio Gear

These generally take place at cell or switching web-sites close to broadcast or other Substantial Energy RF installations, even a variety of miles away.

As cellular operators broaden their systems in MSA's and construct new systems in RSA's, they are finding growing challenge in acquiring authority to put together new towers exactly where necessary. Often the only way to find a cell site in a distinct location is to share an present tower which is previously currently being put to use by means of a single or significantly more other transmitters. Alternatively, the cellular operator might be necessary to find a new tower in an current antenna "farm".

In either situation there is a certain chance that Higher RF signal levels will be current in the instant vicinity of the cellular Gear. In some areas, ambient area intensity levels might possibly even exceed OSHA limits and pose employees hazards!

What is the resolution to these concerns? The resolution is primarily to "enclose" the cellular Gear in a "box" which blocks all RF signals, retaining all other signals out of the "box" and confining the cellular signals within the "box".

As a sensible matter, a ideal shielding "box" is neither achievable nor economically attractive. There should often be penetrations of the shield for antenna transmission lines, principal Energy, phone lines, doors, grounding cables, air conditioners, water and sewer pipes, and so on. The trick is to restrict passage by way of these penetrations so that undesirable RF signals which enter the shielded location are sufficiently modest to lead to no harm to sensible Gear installations.

In the true planet, most shielding desires can be met by means of revolutionary applications of advanced architectural shielding components. By using this kind of issues as fiber attenuation composites, coating suspensions, and additional standard strategies, attenuations of 40 dB or a lot more can readily be obtained in present buildings. Even though not to "CIA" specifications, this kind of attenuations will Often be satisfactory to make certain no ingress into your Gear.

In addition to defending your investment in overpriced Gear, lessening upkeep expenditures, and improving reliability and consumer satisfaction, architectural shielding can safeguard your workers from possibly hazardous exposure to Higher RF signal levels, and could just build the distinction in the viability of a cell site.

Handle of RF ingress troubles starts with site variety. A cautious research, which include area intensity measurements exactly where desired, need to be produced to determine current and long term hazards. This can be difficult, since the "planet" of Higher Energy RF is generally not acquainted to site acquisition people today, or to land mobile engineers. Even the acquisition of meaningful FCC information and facts may possibly be difficult.

True abatement proceeds from a single ) avoidance or two) right layout based mostly on information and facts taken in the site choice procedure. Of course, at present web-sites, diagnostic measurements ought to be utilised, along with a database research to characterize the real and long term atmosphere. From this facts, shielding tactics are chosen and, with the architectural or building designer, integrated into building organizing. In a variety of situations, it could possibly be essential to alter traditional electronics layouts to guarantee that not only the existing installations, but long term expansion will continue to be RF-zero cost.

Just after Gear and shielding installations, check measurements have to be created at the specific "threat" frequencies in order to build that the style goal has been reached. This details also establishes a baseline for long term upkeep checks, which will have to be carried out Frequently. An interval we suggest is yearly, or if unexplained Gear troubles pop up. No matter how properly constructed, there will be the invariable, unauthorized coaxial cable wall penetration, air conditioner replacement, or other adjust which can corrupt the shield.

Lawrence Behr Associates, Inc. has broad consulting engineering encounter in solving undesirable signal ingress situations for cellular operators. Our engineers have the encounter in RF shielding to Handle nicely all challenge signals ranging from lower frequency by way of UHF. We have proficiently shielded cell web pages and switches from Substantial level RF interference arising from LORAN, AM and FM broadcast radio, VHF and UHF broadcast tv, and VHF and UHF communications transmitters.

Our consulting solutions contain site choice compatibility surveys to identify likely sources of Higher level RF signal interference, on-site signal measurements, internal and external traditional and electromagnetic shielding of current buildings, "Substantial tech" shielding for new buildings to mix with and offer the completed appear of appealing workplace decor, and verification and certification of shielding effectiveness.