Learn How To Select the Right Arrestor for Your Application – Coaxial Surge Protection Selection Guide

Arrestors by Frequency and Connector Type

Have you been wondering how to select the correct surge protection for your Coaxial RF application?  This newly-released Selection Guide is a handy tool which will help walk you through the selection process and end up with the best standard solution for your needs.

This include a review of our major product lines, a list of primary selection criteria that are important to know before making a decision, and some additional charts and information to help simplify the process.

Click through below to find the new RF Arrestor Selection Guide and start the process!

Product Selection Guide – Coaxial Lightning (.PDF)

Also Available – Single Page Cheat Sheet – Coaxial Surge Protection Basics (.PDF)

Compact Lightning Protection for Radios Operating Up To 12.5GHz – High Performance G-Class Arrestors

LIghtning Arrestor, TNC to SMA, Bulkhead-Mount, DC to 12GHz

Available with SMA and TNC connectors, our G-Class arrestors (The PTCSAFSAF20G and the PTCTNFSAF20G, for example) cover a wider RF Band than any other coaxial protection design in the world.  Because of the exceptional wideband performance from DC all the way up to 11 or 12.5GHz, there is no arrestor available today that will cover the same number of potential applications.  When the wideband ratings are combined with the extremely small form factor of these units, there is truly no other arrestor out there which can come close.

These units are perfect for retrofit or other installations where space is at a premium, or those who simply want a high quality protector that takes up minimal space!  In fact, these fully featured lightning arrestors barely take up any more space than a typical connector feedthru that contains no protection at all!
Also, keep in mind that like all NexTek solutions….
  • All G-Class arrestors are Designed, Engineered, Assembled, and Tested here in the United States!
  • This design incorporates 30 Years of Experience and Expertise into every feature and detail.
  • They are truly High Quality Advanced Designs, ready for the most demanding applications.


If you would like to see for yourself, just ask us for a Sample or More Information!

Learn More

PTCSAFSAF20G – SMA to SMA, DC to 12.5GHz


PTC Series – Product Family Page

How Do I Choose A Coaxial Surge Arrestor? – A Basic Guide

How do I select the proper coaxial surge protector for my application?  What are the primary criterion I should pay attention to when comparing different lightning arrestors?  This post will review the fundamentals of coaxial arrestor product selection and also provide links to some helpful Articles and Tools to help you learn more about the process and eventually make your own selections!

There are really only four primary selection criteria, with a fifth line below to account for any other requirements.

 RF Performance – Your Frequency of Use and RF Power LevelRF Performance Curve - VSWR is shown on the upper graph, while Insertion Loss (dB) is shown on the lower curve.

During >99% of a coaxial arrestor’s life, it is operating as a totally passive connector.  Therefore, RF Performance ratings are the only specs that matter during this time!

 Connector Type – Your desired connector type and gender configuration.Photo Courtesy: DXZONE.com

In order to ensure the best compatibility with the system they will be used in, it is best to match connector types to minimize the use of adapters.

Surge Response and Performance – Your Surge/Lightning Requirements or Susceptibility LevelsFull Scale Lightning Testing

These can be specific and give a detailed Threat Level to test against along with an accompanying residual energy Test Limit, or it can be as broad as “I know I need protection.”

 DC Pass Required? – Will you be sending DC Power along the coaxial cable with the RF energy?BTL-C08

This is an important detail, as some arrestors are not capable of passing DC Power!

Miscellaneous Requirements – Any additional requirements with a high priority or importance?  Antarctica

Are there any additional (secondary) requirements that could influence the proper product choice?  These could be related to Environmental, SWaP, Lifetime Ratings, Dimensions, or others!

Learn more about the selection criteria above by following the links below… There is a full-length article about Selecting Coaxial Lightning Protectors and two useful links to other pages on nextek.com with even more product selection info!

As always, don’t forget to Contact Us with any questions, comments, or requests for selection assistance!

 Other Arrestor Selection Process Resources

Article – Selecting Coaxial Lightning Protectors Nextek (.PDF)

Post – One Page Arrestor Selection Guide (link)

Online Product Finder Tool (link)

Compact DC Block Arrestors For Radio Protection – Featured Product

We have added NexTek’s new coaxial arrestor product to the website and product selection tool, and you can now find information about all four variations!

The PTI series provides effective protection in an extremely compact form factor, and includes a series capacitor to block DC energy and further reduce the amount of energy that gets past and flows into the radio being protected.  This series capacitor guarantees effective protection from the Gas Discharge Tube front-end by eliminating the need to rely on or coordinate with the output-side capacitor of your radio.

NexTek’s SurgeGuard™ PTI series of DC-Blocked lightning arrestors operate at frequencies up to from 2Mhz to 2GHz.

Available with a TNC (f) bulkhead and SMA (f) connectors, in a range of RF pass band and RF Power ratings.  See below and explore the datasheets to learn additional details!


  • Excellent Response and Residual Energy Reduction
  • Compact TNC to SMA Bulkhead Protector
  • Low VSWR and Insertion Loss
  • Multi-strike, Rugged and Waterproof


Product Page Links:





Learn More

Press Release – PTI Series

PTI Product Family Page

How Do I Estimate Lightning’s Effects on my Radio Antenna?

Have you ever wondered how to calculate lightning-induced antenna-coupling levels for a specific radio setup?  How much energy could theoretically flow along my coaxial cable due to a nearby lightning strike?

Today’s highlighted article is a useful tool for anyone looking to make a assessment of a specific radio antenna’s susceptibility level when a lightning strike occurs nearby.

  • For example, how do you estimate the energy that might be coupled into the antenna from a nearby strike, and what levels of surge (Voltage, Current, and waveform details) should be expected further down the cable run?
  • Have you ever wondered how to calculate lightning-induced antenna-coupling levels for a specific radio setup? 
  • How much energy could theoretically flow along my coaxial cable due to a nearby lightning strike?

This NexTek technical article was published years ago, but the formulae and calculations given are still 100% valid today.

Typical Antenna ConfigurationWhat this article covers:

  • E-Field Coupling – The process of energy coupling into the antenna (from the surrounding charged air, aka the e-field around the lightning strike.)
    • Antenna Length and Operating Band
    • Location of Antenna
    • Pulse Characteristics (Risetime, Pulsewidth, etc.
  • Current Injection – The process causing energy flow due to nearby Current Injection into the earth/ground, which causes elevated ground potential and therefore current flow.
    • Location of Strike
    • Length of Cable Run
    • Current Injection Level
  • Overall Review – What these calculations mean, and what to do with the calculated values!

Please follow the jump to find the article and learn more about estimating the effects of lightning on radio antennae!

Learn More:

Article – Estimating the Effects of Lightning on Antennas

Other Resources:

Article – Get Grounded: Protection of Electrical Equipment Against Lightning Transients

Article – Selecting Coaxial Lightning Protectors

Video – Lightning Strike Hits Cell Tower!

Captured on video in June 2015, this amateur footage shows a lightning bolt hitting a Telecommunications tower directly! The awesome power that thunderstorms contain is on full display, and the speed and violence of a lightning strike are evident. It is easy to understand why lightning can be such a dangerous and damaging event when a strike is captured from this distance and with this much detail.

video platformvideo managementvideo solutionsvideo player

Up to 200,000 Amps and over 1 Megavolt of potential are contained within each lightning bolt. This is enough energy to melt, damage, or catch fire to anything in its path. In this case, the path is a Cell Phone tower…packed with expensive Electronics & Antennas. While towers (as with any outdoor radio antenna installation) are usually well-grounded and take most of the lightning energy to ground (earth) directly…A portion of the energy will directly or indirectly (induced charge) enter the coaxial RF cables and transmission path during the lightning strike event. This lightning energy can wreak havoc and cause terminal damage to radios, antennas, cables, and anything else in the vicinity as it travels through this equipment in search of a path to ground.

Example Tower Installation - Grounding Guide (2)

Luckily, there is a way to remove fear of lightning damage to any coaxial cable run or radio & antenna installation. Installation of coaxial lightning & surge protection at appropriate points throughout the system, especially high-quality surge protection designs such as those offered by NexTek, can eliminate concerns about lightning & surge damage. When arrestors are properly installed and grounded, the risk of damage is virtually eliminated.

Learn more about NexTek Coaxial Arrestors

Of course, the potential danger associated with lightning also extends to people! Be sure to follow Lightning Safety Guidelines…primarily, head indoors as soon as you hear thunder! We are glad that this lucky amateur videographer was OK after shooting this video, but DO NOT recommend trying it again!