The EMIgard™ Series of conductively plated, optical fine wire mesh for EMI/RFI shielding of electronic displays and enclosures is available from Dontech. This shielding mesh is manufactured in 304 stainless, copper, and custom alloys. Meshes are available from 50 to 250 openings per inch (opi) in standard sheet sizes of 22″ x 28″ or precut to a specific size. In a unique, … [Read more...]
EMI Reduction Techniques for High-Demand Consumer Applications
Innovative drop-in SSC solutions effectively manage EMI, preventing costly redesign, reducing production time and maximizing valuable circuit board real estate. Narendar “Buddy” Venugopal, PulseCore Semiconductor, Campbell, CA, USA INTRODUCTION As technology advances become even more sophisticated and applications become increasingly streamlined, traditional methods of EMI … [Read more...]
It’s Off to the Races
British telecom watchdog Ofcom has posted an opening for an apprentice field engineer to be trained in the diagnosis and resolution of radio spectrum interference complaints and associated regulatory/enforcement issues. In addition to listing the expected academic requirements, the notice includes such enthralling language as attendance at “high profile projects and major … [Read more...]
Enduring Challenges at FCC
President Barack Obama made it official on Tuesday, March 3 and announced that his one-time undergraduate and law school friend Julius Genachowski has been appointed as the new Chairman of the Federal Communications Commission. In addition to being a graduate of Columbia University and Harvard Law, Genachowski was more recently the author of Obama’s technology and innovation … [Read more...]
Piratical Peril
Ofcom, the United Kingdom’s telecom regulator, has issued a notice on the dangers of pirate radio and the ongoing enforcement challenges this illegal activity presents. The Ofcom statement pointed out that illegal broadcasts endanger both first responders and ordinary citizens when air traffic control and ambulance, fire, and police radio communications are unavailable because … [Read more...]
Certification Programs: What’s Behind the Terminology?
A well-defined and structured certification program is vital to assuring product quality and safety Randy Ivans, Underwriters Laboratories Inc. Melville, NY The Merriam-Webster® Dictionary defines “certify” as “to attest authoritatively, to confirm, to present in a formal communication, or to attest as being true.” Consider the implications of these words and phrases—confirm, … [Read more...]
Achieving More Accurate Measurement of Conducted RF Emissions Using Modified AMNs
Measurement uncertainty for common-mode disturbances can be reduced from about 22 dB to a maximum of a few dB Mart Coenen, Philips Applied Technologies Eindhoven, the Netherlands Introduction In early 1980, extensive discussions were held within the IEC CISPR/A working group regarding the definition of the impedance characteristics and the RF emission limits attained via the … [Read more...]
Building a State-of-the-Art 5-Meter Chamber
An efficient shield room for automotive testing progresses from design to finished structure Michael Koffink, Bob Mitchell Intertek ETL Semko Littleton, MA Four years ago, we noticed a growing demand for EMC testing from the automotive industry. As cars and trucks now feature myriad on-board electronic devices, they are increasingly susceptible to stray emissions while … [Read more...]
German Study Discounts Causal Link Between Eye Cancer & EM Exposure from Mobiles
A study appearing in the online issue of the Journal of the National Cancer Institute (JNCI) indicates that mobile phone use is not associated with an increased risk of melanoma of the eye. Earlier studies had examined the possibility of an association between mobile phone use and melanoma of the eye, also called uveal melanoma. In the recent study, Andreas Stang, MD of the … [Read more...]
Mobiles Recalled for Exceeding RF Limits
Testing by Industry Canada has revealed that the LG150 flip-phone does not meet the radiofrequency exposure limits established by the Canadian government—i.e., Safety Code 6 as referenced in the regulations of the Radiocommunications Act. An independent accredited certification body has revoked the certification for the LG 150 model, and it is no longer eligible to be … [Read more...]
- « Previous Page
- 1
- …
- 75
- 76
- 77
- 78
- 79
- …
- 88
- Next Page »
