JDS Uniphase CellAdvisor JD780A Series, Руководство пользователя

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JD780A Series Analyzers
Using Interference Analyzer
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Introduction
Interference is becoming more prevalent in the wireless community with the increasing number of
transmitters coming on the air. Wireless service providers have traditionally used spectrum analyzers
to monitor service channels, frequencies, and adjacent spectrum and to locate sources of interference.
A spectrum analyzer can only show you an interfering signal and you require determining the source of
the interference. To solve interference problems, you must understand the RF environment, know
adjacent operating transmitters, and identify any new or unlicensed emitters.
Once a potential interfering signal is identified in the Spectrum Analyzer mode, you can monitor the
signal further in the Interference Analyzer mode. JD780A series provides two different methodologies
to identify and determine interference signals: Spectrogram and Received Signal Strength Indicator
(RSSI). Locating the source of interference signal can be done with geographical information received
from the built-in GPS receiver.
The JD780A series is extremely effective for locating and identifying periodic or intermittent RF
interference. Interference signals derive from several kinds of licensed or unlicensed transmitters that
cause dropped calls and poor service quality.
The JD780A series provides following measurements for interference analysis:
 Spectrum
 Spectrogram (Single/Dual)

RSSI (Received Signal Strength Indicator)
 Interference Finder
 Spectrum Replayer
 Radar Chart
Using a set of the AntennaAdvisor Handle that holds a broadband directional antenna is mandatory in
the Rader Chart mode and its built-in compass, GPS antenna, gyro sensor, and low-noise amplifier
(LNA) benefits you to determine the direction of the interference.
Display overview
Figure 24 provides descriptions for each segment of the measurement screen.