Author Joe Randolph

Joe Randolph

Independent Consultant

Joseph Randolph is an independent consultant with over thirty years of experience in the design of telecommunications equipment. He received his BSEE degree from Virginia Polytechnic Institute and his MSEE degree from Purdue University. Prior to becoming a consultant in 1984, he was employed at AT&T Bell Labs. His background includes the design of traditional telecom voice and data equipment, DSL, and a wide variety of emerging VOIP and IP telephony products including optical network terminal devices. His primary specialty areas are circuit design, lightning protection, international regulatory compliance, and compliance with industry standards such as Telcordia NEBS GR-1089 for carrier-class telecom equipment in the USA. He is a Senior Member of the IEEE and serves on the Telecom Advisory Committee of the IEEE Product Safety Engineering Society.

New Requirements for MOVs Used for Surge Suppression on AC Mains Ports

It is a common misconception that any product that complies with IEC 60950-1 will also comply with IEC 62368-1. A key goal of this article is to help readers of IEC 62368-1 understand the underlying safety concerns that the new requirements are trying to address.

Designing Ethernet Cable Ports to Withstand Lightning Surges

Known mechanisms that couple lightning surges onto communication cables, and how these mechanisms apply for the specific case of Ethernet cabling.

U.S. DoE to Provide Nearly $3 Billion for EV Battery Development, Manufacturing

Wirelessly Powering IoT With 5G Network

Polymer Film Can Limit Electromagnetic Interference

Using Nanomaterials to Create a Passive Dual-Mode Heating and Cooling Device

Scientists Develop Highly Efficient Supercapacitor That Could Rival Batteries

Schurter Completes Review and Passes New REACH Regulations

FCC Orders Blocking of Calls from Robocall Gateway Facilitator

FCC Proposes Expansion of Short-Range Radar Operation

FCC Threatens Fines for Illegal Use of Mobile Frequencies

A Dash of Maxwell's: A Maxwell's Equations Primer - Part 2: Why Things Radiate

ESD Designers’ Headache with Multiple Automotive Test Requirements, Part I

Troubleshooting EMI Issues Caused by Structural Resonances

Energy Release Quantification for Li-Ion Battery Failures

EMC Management in Charging Applications

Common Mode Filter Design Guide

SCIF and Radio Frequency Secured Facility Design, Part 2

Automotive EMC Testing: CISPR 25, ISO 11452-2 and Equivalent Standards, Part 2

Line Impedance Stabilization is in its Seventieth Year and Still Going Strong

Seventy Years of Electromagnetic Interference Control in Planes, Trains, and Automobiles (and Ships and Spaceships, as well)

ESD Designers’ Headache with Multiple Automotive Test Requirements, Part I

Top 10 ISO/IEC 17025:2017 Deficiencies Found in Electronics Testing Laboratories

9 Steps to Select a Test Cable for Millimeter Wave Applications

Automotive EMC Testing: CISPR 25, ISO 11452-2 and Equivalent Standards, Part 1

IEC Published Second Edition of IEC 61340-4-7:2017 for Standard Test Methods of Air Ionization Equipment and Systems

An Overview of Aerospace Battery Compliance

The Future of Wi-Fi

Top 10 ISO/IEC 17025:2017 Deficiencies Found in Electronics Testing Laboratories

Inductance: The Misconceptions, Myths, and Truth (Size Matters)

NASA Space Shuttle’s Return to Flight: The Untold Electromagnetic Backstory

Continuing Your Professional Education in 2022

A Recipe for Success: How to Grow from EMC Novice to EMC Expert

Capacitors: Theory and Application

Ohm’s Law Also Applies to ESD‑Induced Heat Pulses

RF Tech Tip: BNC Versus Threaded Connectors

Joe Randolph

New Requirements for MOVs Used for Surge Suppression on AC Mains Ports

Designing Ethernet Cable Ports to Withstand Lightning Surges