The use of commercial items (CI) or commercial-off-the-shelf (COTS) equipment presents a dilemma between imposing military E3 standards and the desire to take advantage of existing commercial systems, and accept the risk of unknown or undesirable electromagnetic interference (EMI) characteristics. Regardless of the pros or cons of using COTS, any procured equipment should meet … [Read more...]
Beamwidth Loss and Why Test Staff and dB Notation should be Friends
Please Note: - This blog entry continues the thinking behind the creation of the AH Systems webinar on selecting antennas for today’s test requirements. Supporting notes on the webinar can be found on the AH Systems website.(Hint - click the ‘Tech Notes’ Tab and simply select the first document listed on the main page itself).In the last entry we introduced a method that … [Read more...]
A Simplified Method of Calculating the Amplifier Power Required by an RF Immunity System
A.H. Systems recently sponsored an EMC Live webinar on selecting antennas for today’s test requirements in which I introduced a simplified method of establishing the amplifier power required by an above 1GHz RF immunity system. Existing methods, such as slotting numbers into a spreadsheet, do not provide the necessary visualization of the test system behavior, and provide … [Read more...]
EMC War Stories: Letters from Home Part 2: It’s hard for my computer to sleep when I’m doing the laundry
Candace Suriano Suriano Solutions John Suriano Nidec Automotive Motors Americas Dear John, Once again it’s a cold dry winter here and I have found that there is a great way to keep warm— by doing the laundry. I discovered something really strange, though: when I’m taking the laundry out of the dryer it sometimes wakes up the computer on the desk almost ten feet away! I knew … [Read more...]
EMI Across Randomly-Patterned Multiple Traces on a PCB of an Audio/Multimedia Infrastructure: Crosstalk Performance Vis-à-Vis Smart Handheld Devices
PERAMBUR S. NEELAKANTA*, Ph. D., C. Eng., Fellow IEE and AZIZ U. NOORI, M. S. E. E Department of Computer and Electrical Engineering & Computer Science Abstract In the state-of-the-art wireless devices accommodating a dense layout of copper traces on the associated printed-circuit boards (single and/or multi-layered), is inevitable. Relevantly, considering the baseband … [Read more...]
FCC Changes Certification Process
By David A. Case NCE, NCT Senior Technical Leader Regulatory Cisco Systems IncAbstract: The FCC Authorization and Evaluation Branch has been the forefront in regards to reviewing and issuing of FCC certification. With the adoption of the Telecommunications Certified Body (TCB) program, a number of these approvals were done via TCB reviewers with FCC oversight, though the FCC … [Read more...]
Radio Equipment Directive
By Charlie Blackham,Principal Consultant and Director of Sulis Consultants Ltd. This article provides an introduction to the recently published Radio Equipment Directive (RED). It looks briefly at the history of the requirements, the changes in the product and regulatory landscape and looks at what it means to equipment manufacturers. History The current Radio and … [Read more...]
Harmonic Comb Generators Are Useful Tools
By Kenneth Wyatt INTRODUCTION One tool every EMC test lab should own is a harmonic comb generator. A comb generator is simply a device that will produce a set of harmonically related CW signals whose spacing is based on a fundamental oscillator frequency. For example, if we were to start with a 10 MHz clock oscillator and feed the digital output into a coax connector, we’d … [Read more...]
Spectrum Supportability Risk Assessment – A Last Word….For Now….
Hopefully as you’ve been following along our SSRA related posts, you realize that Spectrum Supportability is not something that can be assumed; spectrum demand is increasing and available spectrum is decreasing. The requirement to perform and submit SSRAs is part of the DoD effort to ensure that we don’t continue to field systems with spectrum use issues and/or interference … [Read more...]
A Show Report on the 2015 Santa Clara Symposium on EMC & SI
Whenever I missed an EMC show I always wished there was some sort of report I could read to get a feel for some of what I missed. To that end, here is one on Santa Clara. I have tried to make it informative and fun for non-attendees and attendees alike.This is a major event with a lot of presentations happening in parallel, and I could only attend a short time, so I apologize … [Read more...]
- « Previous Page
- 1
- …
- 25
- 26
- 27
- 28
- 29
- …
- 71
- Next Page »
