Both manufacturers and test labs must decide on the proper test procedures for DFS products. Since July 20, 2006, systems operating under FCC Part 15.407, specifically in the 5250- to 5350-MHz and the 5470- to 5725-MHz bands, are required to support Dynamic Frequency Selection (DFS) before the products can be certified. As part of the approval process, the FCC must carry out a … [Read more...]
FCC Releases Test Results on Possible Interference in the 2155- to 2180-MHz Band
The Federal Communications Commission (FCC) has released a study completed last month by its Office of Engineering and Technology. One of the ongoing goals of FCC policy has been to expand broadband access to more citizens—especially in impoverished or rural areas. Any auction of this particular band would be conducted with the proviso that the winning bidder would be obligated … [Read more...]
Managing & Planning the EMC of MOTS and COTS Used Within MOD Systems & Platforms
Defense contractors intending to supply military off-the-shelf (MOTS) and/or commercial off-the-shelf (COTS) electrical/electronic equipment for use on UK military platforms, or to integrate them into UK military systems now have new guidance on a risk assessment process for achieving electromagnetic compatibility (EMC). Pete Dorey, senior EMC consultant at TUV Product Services … [Read more...]
RFI Shielding for Volume Manufacture
PCB enclosure design, manufacture and assembly need to be considered early in equipment design to avoid costly modifications and delays in bringing the product to market. Alan Warner Tecan Components Ltd. Weymouth, UK With the proliferation of electronics, especially wireless and radio applications, in all areas of everyday life, the need for reducing radiated interference … [Read more...]
Filter Connectors Designed With Multilayer Varistor Arrays
Affordable transient protection is now available within electronic connectors Chris Noade, Syfer Technology Limited Arminghall, Norwich UK "Connectors contribute nothing to electronic equipment" is an old and contentious statement that raised a few hackles when written, but is now undisputedly outdated and wrong! A modern connector, in isolation, can fulfill the equipment … [Read more...]
Simulation of In-Vehicle Human Exposure to Electromagnetic Fields from On-Board Transmittors
Numerical models can provide data from enormous numbers of points and for a number of human simulants Alastair R. Ruddle, PH.D., MIRA Limited Nuneaton, UK On-board transmitters are already commonly encountered in the vehicle environment; typical examples include mobile telephones, Bluetooth systems, and communications equipment used by the emergency services and armed forces. … [Read more...]
Solving the Galvanic Corrosion Issue in EMI Shielding
Tungsten carbide/aluminum composite particles inhibit galvanic corrosion of aluminum. An on-going issue in the design of reliable EMC shielding is galvanic corrosion of aluminum. How can an aluminum frame be protected from galvanic corrosion if it contacts an EMI gasket containing non-aluminum particles? Chromate conversion coatings have long been used to reduce the corrosion … [Read more...]
Off-Chip Decoupling Measures: The EMC Perspective
Off-chip decoupling, or buffering, is a necessity. Over the years, many papers and articles have been written about optimizing off -chip IC decoupling. Many IC vendor application recommendations feature a cluster of decoupling capacitors adjacent to the IC, in close proximity to one another—viz. an electrolytic capacitor along with a small and a large value ceramic capacitor … [Read more...]
On-site EMF Testing of an Emergency Network Communications Vehicle
Thorough testing requires taking measurements both inside and outside the vehicle. David A. Case, Jaime McLain and Murry Gavin Cisco Systems, Inc., Richland, Ohio, USA Experienced compliance test personnel are familiar with the usual spate of RF issues. Tasks range from performing MPE (maximum permissible exposure) studies and SAR (specific absorption rate) testing to … [Read more...]
Simulation of In-vehicle Human Exposure to Electromagnetic Fields Due to On-board Transmitters
Numerical models can provide data from an enormous number of points and for a number of human simulants. Alastair R. Ruddle, Ph.D. MIRA Limited, Nuneaton, UK On-board transmitters are already commonly encountered in the vehicle environment: typical examples include mobile telephones, Bluetooth systems, and communications equipment used by the emergency services and armed … [Read more...]
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