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Handheld Users Group

Handheld Users Group

Delivering leading solutions for today's field and maintenance challenges

Mobile Interference Hunting System


With over 20 years leading the way in handheld testing Anritsu has a well earned reputation for superior measurements in not so superior conditions. learn more about the very latest handheld testing technology.

Click the article below to learn more...

 


 

Simplifying Interference Hunting in the Field

   
Finding interference in the field usually takes two phases. The first step is to locate and characterize the interfering signal using the tower antenna. Next is locating the same interfering signal using a ground level antenna. This second element can pose a few challenges that can be corrected by using the proper test tools.

One issue is that signals that are strong at the altitude of the tower's antenna may be weak at ground level. There may be hills or buildings between your ground level location and the signal source. The first thing is to see if the signal is visible near the base of the tower. If so, it's time to move to the next task – locating the source. If not, there are several things to try:
 
Map
    1. Check other sectors for the interfering signal to get a general idea of the signal location
    2. Move to higher ground to give yourself a clear line-of-sight to the RF source
    3. Investigate nearby valleys, swales, or other low spots. If an RF interference source is in a valley, the radiation pattern will be only visible when you have a direct line-of-sight

 
 
To find interference signals quickly and efficiently, the Anritsu Mobile Interference Hunting System is used. This system automates the interference hunting process. The patent-pending algorithm in the Anritsu Mobile InterferenceHunter™ software uses power-of-arrival technology to quickly measure and locate sources of interference.

The interference hunting algorithms employ channel power measurements, which facilitate hunting a wide variety of signal types, from wideband modulated signals to narrowband or CW sources. Anritsu has the tools needed to locate the emitter while on foot and out of your vehicle. Once sufficient measurements are accumulated and filtered for multipath, the Anritsu Mobile InterferenceHunter™ software draws a circle on the map indicating the position estimate of the source of interference. The diameter of the circle becomes smaller as more measurements are taken, providing a higher degree of confidence.

To learn more about the advantages of interference hunting, download Anritsu's new application note "Mobile Interference Hunting System".
 


3 Keys: Site Master™

Twenty years ago the face of field testing changed dramatically for the better with the introduction of Site Master, the first handheld cable and antenna analyzer. In the two decades since, wireless communications have changed dramatically but Site Master remains the pre-eminent field instrument for three key reasons:


  • Frequency Domain Reflectometry (FDR) - The field test revolution begun by Site Master had a powerful weapon: FDR. When Site Master was introduced, no other field instrument provided this game-changing capability that is now standard.

  • Compact, Durable Design - Field-proven, the durability of Site Master is only surpassed by its small size that brought the power of larger, multiple instruments to a single handheld analyzer.

  • Performance – Unsurpassed measurement uncertainty and best-in-class sweep speed have allowed the Site Master to perform highly accurate and fast measurements anytime, anywhere.

 
Site Master
 
 

DTF Sweep Test Tip

It's important to remember to set frequency range within the load's bandwidth when making DTF sweeps. If an antenna is used for the load, any portion of the DTF sweep that goes outside the pass band is mostly reflected, reducing the accuracy of the vertical axis Return Loss or VSWR measurements. If an antenna is placed at the other end of the cable, the DTF frequency range should be restricted to the antenna's pass band.
 

Product Close-up

   
To find interference signals quickly and efficiently, Anritsu has developed its Mobile Interference Hunting System. Integrating an easy-to-use interface, fast setup times, voice prompt, and numerous features to effectively hunt a variety of signal types in multiple RF environments, the system automates the interference hunting process and saves valuable time.

Multiple measurements are automatically taken and processed using the MX280007A InterferenceHunter software. Using mapping software stored on a Windows laptop/tablet, an Anritsu handheld spectrum analyzer and an omnidirectional antenna, the system guides the driver to the source of interference.

The Mobile Interference Hunting System is designed for Anritsu's industry leading Spectrum Master™, Site Master™, BTS Master™, Cell Master™, or LMR Master™ handheld analyzers. A key component of the Anritsu Mobile Interference Hunting System is an off-the shelf magnet mount omnidirectional antenna. Depending on the antenna used, this interference hunting system covers the entire frequency range provided by the spectrum analyzer.

 
Magnet Mount Omnidirectional Antenna
 

 

Magnet Mount
Omnidirectional Antenna


For more information, visit the Mobile Interference Hunting System page.

 

Protection for Your Industry-leading LMR Master™ Analyzer

   

Our on-going communications with Land Mobile Radio (LMR) technicians has led us to develop the MA25200A high-power protection module for the industry-leading LMR Master™ S412E compact handheld multi-function analyzer. Field technicians can use the LMR Master S412E with the MA25200A to connect directly to NBFM, P25, NXDN, DMR, TETRA and PTC radios without worrying about an accidental transmitter key down that could damage the handheld analyzer.

The MA25200A combines the signal generator port into the test port to support receiver sensitivity testing. It can accept 125 watt base station transmitters for up to one minute and 25 watt mobile transmitters for indefinite periods.

If you use an LMR Master S412E, the MS25200A is a much-needed accessory.

To learn more about protecting your analyzer, visit the High Power Tx/Rx Input Protection Module MA25200A product page.

 

Tx/Rx Protection Module

High Power Tx/Rx Input
Protection Module MA25200A

 
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