The EMC Blog

- January 31, 2014

Kenneth Wyatt is an independent consultant and specialist in electromagnetic compatibility (EMC) design, test and troubleshooting. In The EMC Blog, he discusses issues, trends, EMC design, and product troubleshooting techniques. One specialty is his use of do-it-yourself probes and use of low-cost test equipment and measurement techniques for evaluating EMI issues on the workbench. He's also the coauthor of The EMC Pocket Guide and coauthor for EMI Troubleshooting Cookbook for Product Designers, both published by SciTech Publishing and available on Amazon.

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Review: Signal Hound VSG25A vector signal generator

  • 07.23.2015

Suddenly, we seem to have a plethora of low-cost RF signal generators available for the RF experimenter and EMC engineer. Signal Hound has really raised the bar on these instruments with their new VSG25A vector signal generator, introduced recently at the International Microwave Symposium in Phoenix last May. I was able to get my hands on one to try out for potential EMC test applications.Read More...

GaN technology and the potential for EMI

  • 07.05.2015

While attending DesignCon 2015 last January, I had the chance to hear an interesting keynote presentation by Alex Lidow, CEO of Efficient Power Conversion, Inc., speak on the upcoming development in gallium nitride (GaN) technology for high-power switching devices. Because these devices switch at sub-picosecond speeds, there are EMI ramifications. This article evaluates a simple half-bridge DC-DC converter using GaN switching.Read More...

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Review: The Aaronia BicoLOG 30100X and HyperLOG 7060 EMI antennas

  • 07.01.2015

The majority of my work includes troubleshooting and pre-compliance testing for clients and I’m always on the lookout for useful EMI equipment to make my job easier. In this review I'll be trying out the Aaronia BicoLOG 30100X (30 to 1000 MHz active antenna with attached 40 dB preamp) and a HyperLOG 7060 (700 MHz to 6 GHz log-periodic).Read More...

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Beware of hidden antennas!

  • 06.23.2015

There are many causes of radiated emissions and the product designer needs to be able to identify the “hidden antennas” that cause this.Read More...

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Review: The AET USDS spherical harmonic comb generator

  • 06.16.2015

Having been a long-time user of harmonic comb generators, I’ve always admired the concept of Applied Electromagnetic Technology’s spherical harmonic comb generator design. I finally was able to get my hands on one to try out.Read More...

Advanced radiated emissions troubleshooting setups with the Rigol DSA815

  • 05.05.2015

Many product designers and EMI engineers are using the popular Rigol DSA815 spectrum analyzer for EMI troubleshooting and pre-compliance testing. I’d like to demonstrate the instrument settings and measurement features I most commonly use when troubleshooting radiated emissions in the 30 to 1000 MHz region. You’ll find these useful for either near field probing or testing emissions using a nearby EMI antenna. Read More...

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Review: The Red Oak Canyon “RF Pro Touch” RF generator

  • 04.26.2015

This small portable RF generator with very accurate RF output levels incorporates Robert Yarbrough’s model TPI Synthesizer version 4, repackaged with touchscreen control and chargeable battery. Read More...

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Review: The Vectawave VBM2500-3 RF amplifier

  • 04.20.2015

Recently, several of my clients have been requesting help with pre-compliance testing in the 10 to 50 V/m range, well beyond what the simple TPI or Windfreak RF synthesizers alone can muster. So, I’ve been continuing to look for small low-cost RF power amplifiers that can help me achieve these higher power levels.Read More...

EMC questions answered (part 7)

  • 04.14.2015

Several great questions on troubleshooting radiated emissions were asked during my recent webinar, Troubleshooting Radiated Emissions, hosted by UBM and sponsored by Rohde & Schwarz last April 2015. Unfortunately, we ran out of time to answer them all, so here they are with answers. Read More...

EMC Symposium 2015 (Santa Clara)

  • 03.23.2015

The IEEE International Symposium on EMC was held early this year, due to the international symposium on EMC in Dresden, Germany, this year. As always, the week's program was full with multiple simultaneous tracks. I'll summarize some of the high points.Read More...

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