BLUF—that’s "Bottom Line Up Front" for those that don’t speak acronym-ese—the 2013 IEEE International Symposium on EMC was another smashing success! Denver is a great town for a convention, the facilities were excellent and as always, the Symposium committee pulled it all together and put on an outstanding show. If there were any hitches or glitches, it sure didn’t show. I’ve … [Read more...]
Elephant in the Test Room #1 Continued – The “Money No Object” Approach to Fixing the Under-Test Situation
Read other posts in the "Elephant in the Test Room" series here.Recap on this threadThe room: MIL-STD RF immunity testing – 1-18GHz 200v/mThe elephant: Everyone in the room is aware that a significant fraction of the ‘calibrated’ 200v/m test field is actually created at the wrong test frequency.The culprit: Notoriously high ‘start of band’ harmonics produced by all octave band … [Read more...]
Another IEEE International Symposium on EMC
By the time you read this, you SHOULD be at the annual IEEE EMC Society’s Symposium in Denver, CO. At least I hope you are! I know that the fiscal environment is tight these days, and if you happen to work for the US DoD and/or are a contractor supporting the US DoD, funding travel is almost impossible. I suspect that numbers will be down, but hopefully not down too much. … [Read more...]
Do We Only Believe Things that Match Our Opinion?
Whoopee! I finally got some feedback that people actually read some of the stuff I write. I received several great comments about a previous post titled: Electromagnetic Fields Don’t Exist. I’m not sure they liked what I had to say, but most were nice about it. I apparently excited some nerves. That happens when they’re exposed to electromagnetic radiation. I’m using … [Read more...]
I Can’t Believe I Just Cooked My Pinna
In the previous post, I was discussing cellphone RF safety and the fact that we really don’t know what level is safe and what’s not. Those individuals that go around with a cell phone or Bluetooth device glued to the side of their head will be happy to know that the FDA and the FCC are concerned about cell phones cooking their outer ear (the pinna). They have apparently … [Read more...]
Electromagnetic Fields Don’t Exist!
Some time ago, I made a big to-do about smart electric meters and the fact that they might be hazardous to our health. The general response I got was: you got to be kidding. Sometimes from the more heavily invested the response is: there is insufficient evidence to make that conclusion. The World Health Organization concluded that electromagnetic fields from cell phones and … [Read more...]
OMB Circular A-11: Preparation, Submission and Execution of the Budget
What’s that you say? What does OMB Circular A-11 have to do with anything EMC related? That’s a pretty good question, and one that I would have asked myself. Until I read (because it was pointed out to me) section 31-12 of the latest edition of the Circular. It starts off:“The value of radio spectrum required for telecommunications, radars, and related systems should be … [Read more...]
Elephant in the Test Room #1 Continued – How Other EMC Sectors Dealt with the Elephant
Read other posts in the "Elephant in the Test Room" series here.Recap on this threadThe room: - MIL-STD RF immunity testing – 1-18GHz 200v/mThe elephant: - everyone in the room is aware that a significant fraction of the ‘calibrated’ 200v/m test field is actually created at the wrong test frequency.The culprit: - Notoriously high ‘start of band’ harmonics produced by all octave … [Read more...]
Commercial EMI Standards vs. MIL-STD-461 … Now What?
I seem to hear a never ending litany of complaints about how the US military acquisition community has to use more and more commercial equipment (COTS or CI) and that said equipment tends to be highly problematic from an EMC perspective. I tend to dwell on this subject in this blog space, hopefully from different angles, but at the end of the day, I don’t see much being done … [Read more...]
Growling in Hi-fi and Stereo
In the last couple of posts I’ve been discussing ground loops and bonding and I made a comment that at the higher frequencies, i.e. VHF/UHF and higher multiple point grounding is used. It occurs at these higher frequencies because of capacitive coupling whether we planned it that way or not. The so-called ground loop exists whenever there are multiple ground connections … [Read more...]
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