Read other posts in the "Elephant in the Test Room" series here.Elephant #2 - Disharmony in Harmonic LimitsThe Room: RF immunity testingThe Elephant: The curbing of the contribution made by harmonics to a calibrated test-field varies wildly from standard to standard, and within standardsThe Culprit: Harmonic limits that are seemingly not well thought through, and / or are open … [Read more...]
FCC Frees Up Airwaves for Wi-Fi Use
U.S. regulators approved measures this week to free up more spectrum for Wi-Fi and wireless broadband use in a move they hope will reduce spectrum congestion and boost the development of new, faster Wi-Fi technology. In a decision made Monday, the Federal Communications Commission voted unanimously to make an additional 100 MHz of spectrum accessible to Wi-Fi technology for … [Read more...]
X-Band High Gain Power Amplifiers Offer High Linearity Performance
Pasternack Enterprises, Inc., a supplier of RF, microwave and millimeter wave products, has released a new family of coaxial X-band high gain power amplifiers. The new X-band power amplifiers are suited for high linearity applications with frequencies ranging from 8 to 12 GHz andare typically used as driver amplifiers or high power output amplifiers in a wide variety of … [Read more...]
Converting Radio Waves into Light
Scientists in Denmark and the US have developed a new approach to detecting and strengthening ultra-weak radio signals they say could benefit a range of industries. According to the researchers, detecting extremely weak radio waves is key to many modern technologies, including satellite navigation, long-distance communications, radio telescopes and magnetic resonance imaging … [Read more...]
Using Lightning to Test Power Grid Health
A Swedish researcher has developed a new method of employing lightning and other high voltage currents to benefit power companies. Normally considered disruptive to transmission lines and destructive to the power grid, these so-called natural transients could be used instead to monitor the wear and tear on power components. “We can use these high voltages to obtain more … [Read more...]
A National Plan for EMP Protection (Part 2) – Protection of Buildings
Don White Consultant, Don White Consultants Jerry Emanuelson Consultant Part 1 of this article addressed a proposed national plan for U.S. EMP protection. Part 2 of the article presents methods and techniques for EMP protection of buildings, solar rooftops and other structures. As such, Part 2 covers details of shielding, bonding, grounding, and cable or device surge … [Read more...]
Mitigating Excessive Emissions, 2nd Edition
Donald L. Sweeney and Marilyn Sweeney D.L.S. Electronic Systems, Inc. Mitigating Excessive Emissions was originally written in 1988 and presented at the IEEE EMC Symposium in Atlanta Georgia. The concept and paper have been used by the author hundreds, if not thousands, of times to illustrate what he calls “The Barbell Model.” This illustrates, in very simple terms, how … [Read more...]
EMC War Stories: Letters from Home
Candace Suriano Suriano Solutions John Suriano Nidec Automotive Motors Americas PART 1: MY CELL PHONE CAN TALK TO ME IN STEREO Dear John, I am snowed in here at home with the kids. You may be in an EMC lab solving some tough issues, but I’ve been very busy here at home with some interesting problems of my own. We’ve been bothered by the behavior of our computer … [Read more...]
A Design Review of the Automotive Radiated Emissions Test Fixture
Tom Mullineaux RF Engineer From a cold, dispassionate RF engineering perspective, the automotive radiated test set-up is a strange looking transmit/receive arrangement, with the cable harness of the equipment under test (EUT) suspended above a large copper sheet acting as the transmitter, and a huge antenna close to the chamber floor, and partly in the shadow of the copper … [Read more...]
UPDATE: Toyota Documents Show EMI as Possible Root of Sudden Acceleration Problem
UPDATE March 19, 2014 The U.S. Justice Department announced Wednesday that Toyota Motor Corporation will pay $1.2 billion to settle a criminal probe into whether the automaker handled reports of safety issues in its vehicles properly. The agreement ends a four-year investigation into sudden unintended acceleration complaints dating back to the late 2000s. The issue first … [Read more...]
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