New White Paper – Using C-Type and Pi-Type EMI Filters for MIL-STD 461G, CS116 Compliance

We have posted a brand-new Technical White Paper, which can be found in our Resources Section.

This White Paper covers some basic information about how C-Type and Pi filters can be useful in providing protection against MIL-STD 461G, CS116 transient requirements.  The relevant transient injection requirements involve high-energy 1, 10, and 30MHz ring waves being applied to DC and AC power lines (or other conductors) and the DUT and Equipment being protected should survive with no damage.

Example Test Setup – MIL-STD 461G, CS116

EMI Filter Capacitors can provide excellent protection against this type of threat, and when properly integrated into an overall EMI/Transient-compliant design (with Limiting or other Filtering components) they should allow for full compliance to CS116 requirements.

Link to Paper

View or Download “EMI Filters used for CS116 Protection” White Paper

Resources Page – Where to Find Additional Technical Papers, Articles, etc.

New Line of COTS DO-160G Avionics Protection for RF Lines

NexTek is proud to announce the release of a new line of standard products, engineered specifically to protect Coaxial RF lines and systems against Lightning Damage as required to meet DO-160G, Section 22.

Available in a variety of pass bands, packages, and with multiple connector options; these designs are based on years of experience providing solutions to the Aerospace and Avionics sectors.  When compact size and light weight are critical, but effective and serviceable/replaceable protection is required;  The FPD series of lightning protection devices can meet all of these performance points, in a highly reliable and robust package.


Example FPD Package


Standards Met

D0-160G, Section 22 – All Waveforms and Test Levels

MIL-STD 461G, CS 117 – All Waveforms and Test Levels

Options Available

Connectors – Type N, TNC, SMA, 2.92mm, MCX, MMCX, and others available

DC Power – DC Pass or DC Short/Block Options available

Frequency – Pass Bands between DC and 18GHz available, across the entire range of designs (not within a single design.)


FPD Series Family Page

FPD Series Family Datasheet (.PDF)

DO-160 Avionics Protection – Industry Page

New Technical Note – Transient Testing GDT-Based Surge Arrestors – Information and Details

Full Scale Lightning Testing - Technical Note GDT Transient Testing

Would you like to know more about performing Transient Testing on Gas Discharge Tube based arrestors?  More specifically, testing arrestors against the common Lightning-derived industry-standard 1.2×50µs/8×20µs Voltage/Current Waveform using commonly available equipment to 6kV/3kA surge current levels.

The 1.2×50µs/8×20µs standard is meant to replicate conditions and energy levels that you can expect during an Indirect Lightning Strike, i.e. one where there is a nearby Lightning strike but without any direct attachment to the cable being test.  These are also known as Induced or Coupled Lightning transients, because the lightning energy does not need to direct connect or attach to the coaxial cable’s center conductor for that conductor to be carrying Lightning surge energy.

If you’d like to learn more about how to perform this testing, and even some insights about how a Gas Discharge Tube responds to this type of transient event… check out the brand-new Technical Note/White Paper posted today!

Learn More

Technical Note – Coaxial Arrestors – Lightning Arrestor Testing Details (.PDF)

Coaxial Surge Arrestors (Home Page)

Protecting Radio Equipment from HEMP/NEMP High Speed Transients – Coaxial Arrestor Threat Type Spotlight

This post is about protecting against high speed HEMP/NEMP pulses, one of the many types of transient threat that NexTek arrestors provide protection against.  Although Lightning energy is the primary source of damage to coaxial lines and systems where they are used, there are also other types of Surge Energy that can cause damage to electronics.

HEMP, NEMP, EMP Effects over USA
Map of Estimated Effects of High Altitude EMP Blast over the United States

HEMP/NEMP, or High altitude Electro Magnetic Pulse/Nuclear Electro Magnetic Pulse, discharges are among the most rare types of coaxial transient threats…but also among the most potentially damaging!

Damaging Nature of HEMP/NEMP Threats – The high-speed and extremely high energy nature of HEMP/NEMP transient events means that most modern electronics are left vulnerable to damage or permanent failure.  The total energy contained within a nanoseconds long pulse has hundreds of kV or potential and multiple kA of current.

Difficulties in Providing HEMP/NEMP Protection – Providing protection against high-speed transient energy pulses such as those caused by HEMP/NEMP events can be extremely challenging for coaxial RF applications for one important reason;  some of the Transient Energy can actually be within the normal pass-band of the radio/system during normal operation.  This type of conflict makes it difficult to provide optimal (minimal loss) performance during normal system and radio usage but also maintain adequate high-speed Transient response to provide protection against this type of high-speed threat.

To learn more, discuss your requirements, or receive feedback regarding protection options for your application…Please Contact Us!


How to Determine Protection Level Requirements and Identify the Correct Solution – When examining a specific application and to quantify the EMP threat level so as to inform the selection of appropriate protection, there are two main paths to travel down:

One, the EMP threat may be given by a specific Industry Standard document (MIL-STD, IEC, IEEE, EN, etc) according to a judgement made upstream in the overall program… Second, in the absence of a specific requirement…you can determine an approximate threat level or desired protection level based on the program-level requirements, estimated risk, and even things like the estimated cost of protection.

See below for a table which lists some EMP Requirements which may apply to a given application:

  • MIL-STD 188-125-1
  • MIL-STD 188-125-2
  • MIL-STD 461, multiple subsections
  • MIL-STD 464, multiple subsections
  • IEC-61000-x-x, multiple subsections
  • Or any others that deal with E1, E2, and E3 Pulse Types
  • Also Related – IEMI Standards

Learn More:

Threat Type Page – HEMP/NEMP Protection

Coaxial Surge Arrestors – Home Page