Anritsu Site Master S331D

S331dAnritsu S331D Cable and Antenna Analyzer, 25 MHz to 4.0 GHz, with built in DTF

The Anritsu S331D spectrum analyzer is a wide band, very sensitive receiver. It works on the principle of "super-heterodyne receiver" to convert higher frequencies (normally ranging up to several 10s of GHz) to measurable quantities. The received frequency spectrum is slowly swept through a range of pre-selected frequencies, converting the selected frequency to a measurable DC level (usually logarithmic scale), and displaying the same on the CRT of the Anritsu S331D. The CRT displays received signal strength (y-axis) against frequency ( x-axis).
Some applications for Anritsu S331D Spectrum Analyzers include Site Monitoring: Verify that the frequency and signal strength of your transmitter is accurate. Interference: Before a system is installed you use a Anritsu S331D spectrum analyzer to verify that the frequencies (you plan to use) are not occupied or if the presence of a very strong signal will interfere with your new setup. Interference can be created by a number of different situations. Other tests that utilize the Anritsu S331D spectrum analyzer features include antenna isolation, co-channel interference, adjacent channel power, occupied bandwidth, intermodulation, microwave or satellite antenna alignment, and characterization of components.
Site Master is the instrument of choice for transmission line/antenna installation and maintenance. It is the best way to reduce maintenance expenses and improve quality. It replaces stacks of heavy, expensive, and complex test equipment. Site Master¿s frequency domain reflectometry technique allows it to locate faults before they become catastrophic faults, thereby creating huge cost savings. The Site Master is a precision, hand-held return loss/SWR and fault location measurement instrument. The Site Master series offers wide frequency coverage, from 2 MHz to 20 GHz. Built-in fault location, RF power monitor, bias tee, and spectrum analysis capabilities are available. Light weight, rugged design, and wide temperature range make them ideal for field applications. Site Master¿s proprietary design provides superior immunity to on-channel RF interference, which is important for live site testing. Site Master Software Tools is a Windows® compatible software program provided with every Site Master unit. This software program provides many useful features, including a database for Site Master measurements, Smith Chart display of S11, zoom capability, a "drag-n-drop" overlay for measurement comparison, the capability to download data to a PC, the capability to upload data such as custom cable list or traces to selected Site Master model, and distance-to-fault calculation from return loss or SWR plots. Advanced printing capabilities are provided by Site Master Software Tools including user definable plot scaling and a multiple plots per page option. Site Master is the first test tool to provide the required accuracy, interference immunity, and repeatability for transmission line/antenna commissioning, and maintenance of today¿s wireless systems infrastructures.


  • Accurate return loss/SWR and fault location measurements
  • Accurately tests RF transmission lines and antennas
  • Superior immunity to on-channel interference for testing at co-located antenna sites
  • Multilingual user interface: German, Spanish, French, Chinese, Japanese
  • Insertion Loss/Gain (S251C only)
  • Spectrum analysis (S114C and S332C only)
  • Optional RF power monitor
  • Optional built-in bias tee (S251C only)
  • Synthesizer accurate to 75 ppm
  • Internal memory saves up to 200 traces
  • Instrument configuration up to 10 configurations
  • Alphanumeric trace naming
  • Time, Date stamp
  • Field replaceable battery
  • Segmented limit lines
  • Six markers