Mobile Wireless Learning Center

Industry Leading Interference Hunting & Monitoring Technical Documents


Technical Documents:

Understanding PIM

A subtle, but widespread, cause of interference in radio frequency networks in general, and cellular networks in particular, is something called passive intermodulation, or PIM. This paper explains what PIM is, common sources of PIM, how PIM is identified and tested, and the different ways in which PIM sources can be located in the field.
Application Notes:

Interference hunting in TDD networks

In time division duplex (TDD) networks, the downlink (DL) and uplink (UL) use the same frequency band in different timeslots. When viewing such TDD signals on a conventional spectrum display, it is impossible to differentiate the two as well as any other unwanted signals present in the same spectrum. This makes interference hunting extremely difficult.… Read more »

Evolving Challenges in LTE / Cable Interference Issues

Over the last year, awareness of LTE/cable-related interference issues has grown substantially in both the cable and the wireless/cellular industry. This white paper discusses the results of continued field trials and studies in the area of LTE/cable interference and presents information regarding ongoing LTE developments that may have an impact on cable systems such as… Read more »

Recognizing and Resolving LTE/CATV Interference Issues

This white paper offers an understanding of LTE technology and the means by which LTE-related interference can be identified, localized, and resolved – critical efforts for the efficient operation of both cellular and cable networks.

Introduction to Interference Hunting

In this white paper, we will explore the topic of interference hunting beginning with a broad overview of the topic and then leading to a more practical discussion on the different types of interferers, analysis of interferers and the tools that are often used in the field to perform interference hunting.

Detecting & Locating Interference from Bidirectional Amplifiers

Oscillation caused by insufficient path loss between a bidirectional amplifier’s (BDA) donor and serving antennas is one of the most common and most serious forms of interference in cellular networks. This white paper provides a general overview of how BDAs work, the conditions leading to oscillation, and practical information for identifying and locating oscillating BDAs.

Identifying and Locating Short-Duration Interferers

The ability to efficiently detect, analyze and locate sources of radio-frequency interference has become increasingly important in modern wireless networks. Unlike constant or near-constant sources, so-called short-duration interferers can only be detected for brief periods of time and therefore special tools and techniques are often required when searching for these types of signals. This paper… Read more »
Application Notes:

R&S®DDF007 Locating radio transmitters

This application brochure describes how the R&S®DDF007 can be used as a fixed or mobile DF station, or as a portable manual direction finder for indoor applications, and can be reconfigured within minutes to meet the requirements of a given task. The R&S®DDF007 comes with a wide range of powerful software options and add-ons, making… Read more »
Application Notes:

R&S®PR100 Locating a signal source

This application brochure describes the procedure for locating a signal source using an R&S®PR100 portable receiver and an R&S®HE300 active directional antenna.