The FMEB and the FMEC line of filters from Schurter, Inc. have been optimized especially for use in DC applications, especially those requiring increased attenuation of asymmetric disturbances. These devices have a current rating of 30 amps at 80 VDC and are offered in single and dual polarity output circuits. The single polarity FMEB has been crafted for a maximum operating … [Read more...]
WiFi Antennas Crafted for Reduced Interference and Flexible Coverage
The new WiMAX 2.5-GHz antenna from Andrew Corporation is a 65-degree, azimuth beamwidth, dual-polarized base station antenna that provides 18 dBi of gain and up to 10 degrees of electrical downtilt. Specifically, this antenna features Andrew’s proprietary Teletilt® variable electrical downtilt design—a feature that allow remote, temporary adjustment of the antenna to deal with … [Read more...]
Optic Rotary Encoder Targets Applications in MRI Units and Other Extreme EM Environments
The TD5207 from Micronor, a non-metallic fiber optic rotary encoder, has been designed especially for use in motion control systems operating in extreme electromagnetic fields. Medical diagnostic and research applications include MRI (magnetic research imaging) or NMR (nuclear magnetic resonance) tomography imaging systems. The encoder also serves as the control feedback … [Read more...]
A Discussion on the FCC SAR Test Guidance Documents for Laptops and Handsets with Multiple Transmitters
The FCC will address exactly what TCBs can review for SAR and simultaneous transmitters in future updates to the TCB exclusion list. David A. Case, Cisco Richfield, Ohio, USA For those involved with product approval for Federal Communications Commission (FCC) certification, the use of the Telecommunication Certified Body (TCB) for approval helps speed the process for product … [Read more...]
UK Telecom Regulator Ofcom Announces Outcome of Radio Spectrum Auction
British telecom regulator Ofcom has announced the outcome of its fifth auction of radio spectrum. The auction was for spectrum in the 1452- to 1492-MHz band, known as the L-band. This part of the spectrum is well suited for offering services such as mobile television, wireless broadband, and satellite radio. One notable winning bidder was Qualcomm UK Spectrum Ltd, which paid … [Read more...]
Overview of Standards Organizations
The IEEE Standards Organization has posted an informative overview of the world’s standards development organizations including the International Electrotechnical Commission (IEC), the International Organization for Standardization (IOS), the ISO/IEC Joint Technical Committee 1 (ISO/IEC JTC 1), the International Telecommunication Union (ITU), the International Telecommunication … [Read more...]
DARPA Seeks to Use EM Waves to Extinguish Fires
DARPA, the Pentagon’s Defense Advanced Research Project Agency, has announced a new research program into “Instant Fire Suppression.” The agency noted that “Fire especially in enclosed military environments such as ship holds, air craft cockpits, and ground vehicles, continues to be a major cause of material destruction and loss of warfighter life. Essentially, there have been … [Read more...]
AT&T Signs Five-Year Telecom Contract with Shell
AT&T Inc. has announced that it has won a $1.6 billion contract to provide Royal Dutch Shell Plc., the Netherlands-based oil and gas giant, with advanced telecommunications services. The five-year agreement will see AT&T providing, managing, and maintaining Shell’s worldwide communications infrastructure, while looking after its global mobility needs.AT&T says that … [Read more...]
Radio Free Europe Accuses Kazakhstan of Deliberate Interference
Radio Free Europe has issued a statement on a “very disturbing” case that smacks of “deliberate interference” by the Kazakh government , Internet users have been prevented for more than five weeks from accessing the Kazakh-language website of Radio Free Europe/Radio Liberty. Access to the Kazakh site was interrupted on April 11 and has continued despite RFE/RL’s repeated … [Read more...]
A Second Look at the FCC Dynamic Frequency Selection Certification Issues
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...]
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