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MS27101A Interference Hunter

Remote Spectrum Monitor

  • 9 kHz to 6 GHz
  • Sweep speed up to 24 GHz/s
  • Integrated web server to view, control and conduct measurements via web browser
  • Hardware watchdog timer to insure long-term stability for remotely deployed monitors
  • Low spur levels for accurate signal discovery
  • 20 MHz instantaneous FFT bandwidth

Anritsu MS27101A Remote Spectrum Monitor

Anritsu offers three models of remote spectrum monitoring products, designed to both mitigate interference problems and to identify illegal or unlicensed signal activity.  The MS27101A is housed in a ½ rack enclosure with 1U height, designed exclusively for indoor applications.   MS27102A is an IP67 rated device which operates outdoors, with the ability to be mounted on poles or walls (using the included mounting bracket).  The MS27103A is a multi-port spectrum monitor (12 RF In ports or optionally 24 RF In ports) which is ideal for cellular, DAS and other applications requiring the use of multiple antennas.

Capable of sweep rates up to 24 GHz/s, each monitor allows for the capture of many types of signals.  This includes periodic or transient transmissions as well as short “bursty” signals.  The 20 MHz instantaneous FFT bandwidth available on each monitor provides the ability for wideband real-time captures of signal activity for subsequent post-processing.  IQ captures can be recorded both in block mode or streamed to internal memory and remote clients.  A “save on event” feature is also provided to capture spectrum measurements only when certain user-settable thresholds are violated.  This saves memory space since only signals of interest are captured and recorded.

Communicating with Remote Spectrum Monitors

Several ways of communicating with the remote spectrum monitors can be utilized.  These methods are highlighted below.

An integrated web server is embedded into each monitor.  Using an internet browser (Chrome and FIreFox are supported), a user from anywhere in the world can log in to the spectrum monitor and control any of its features.  This includes such parameters as frequency setting, RBW/VBW control, reference level configuration and many other settings relevant to the user’s spectrum monitoring application.  At the same time, trace data, spectrograms and other measurements can be viewed inside the browser window.  A key advantage of the web server is that it is operating system platform agnostic.  Any electronic device capable of rendering a browser will work with the web server.  PCs/laptops, tablets or even smart phones can be used to view spectrum and adjust remote instrument settings.  Each monitor also features Gbit Ethernet, allowing fast transfers of measurement data and control information.

Users can also write their own monitoring program using available SCPI commands.  Anritsu provides a user manual listing each SCPI command, a description of the commands and the correct syntax required for each command.  Additionally, each individual pair of IQ data output by the monitors is time-stamped using high precision GPS signals.  This enables the user to use IQ data for Time Distance of Arrival (TDOA) applications for geo-locating signal positions.  IQ data time stamp resolution is less than 9 nSec for precise signal location calculations.

VisionTM Software

Vision software is also provided as an option for all spectrum monitor models.  Vision works with the monitoring hardware to automate the process of collecting measurement data, providing useful information about network heath and use of the spectrum.  Vision is composed of two components responsible for monitoring and locating interference signals, called Vision Monitor (option 400) and Vision Locate (option 401).  Vision Monitor automatically records spectrum data, maintains a searchable spectrum history database, enables alarm functions for unusual signal activity and provides a set of tools for managing the spectrum monitoring system.  Vision Locate provides the capability to geo-locate interference or illegal/unlicensed signals.  To properly locate signal positions, three or more monitors must be used.  More information about the Vision products can be reviewed on the Anritsu website. 

Key Features

  • 9 kHz to 6 GHz
  • Sweep speed up to 24 GHz/s
  • Integrated web server to view, control and conduct measurements via a web browser (both Chrome and FireFox supported)
  • Remote firmware update capable
  • Watchdog timer to insure long-term stability for remotely deployed monitors
  • Half rack form factor for indoor deployments
  • Linux operating system
  • Low spurious signals for accurate signal discovery
  • 20 MHz instantaneous FFT bandwidth
  • Low power consumption < 11 watts  (input voltage 11 to 24 VDC)
  • Integrated GPS receiver for monitoring location and time synchronization applications
  • Gigabit Ethernet available for high speed transmissions
  • Interference analysis:  spectrogram and signal strength
  • Dynamic range: > 106 dB normalized to 1 Hz BW
  • DANL: < -150 dBm referenced to 1 Hz BW, preamp On
  • Phase noise: -99 dBc/Hz @ 10 kHz offset at 1 GHz
  • IQ block mode and streaming with time stamping for TDOA applications
  • Vision software optional for automated spectrum measurements, setting alarms and geo-locating signal sources 

MS27101A Applications

MS27101A is designed for indoor rack-mount environments.  Typically these monitors are positioned in a permanent or semi-permanent location for radio surveillance and monitoring.  Government regulators often use outdoor monitors for enforcing spectrum policies.  Police, fire fighters, air traffic control, railroads using positive train control (PTC), military and emergency services must all have access to communications free of impediments and distortion. 

Other applications include:

  • Spectrum occupancy measurements
  • Monitor jails/prisons for illegal broadcasts
  • Security at military facilities, national borders, utilities, airports, etc
  • Spectrum monitoring associated with RF lab testing
  • Detection of unlicensed or illegal transmitters 



MS27101A Remote Spectrum Monitor Applications

  • Government regulators enforcing spectrum policies
  • White space monitoring
  • Sensitive site monitoring (national borders, military facilities, nuclear power plants)
  • Airport monitoring (with communication frequencies often adjacent to FM bands)
  • Monitor jails/prisons for illegal broadcasts
  • Positive Train Control (PTC), insure communication channels open for trains
  • Cable TV, to mitigate leakage to outside environment and leakage into cable system

Software Options

Option Description
MS27101A-0706 9 kHz — 6 GHz Spectrum Monitor
MS27101A-0400 VisionTM Monitor Enabled
MS27101A-0401 VisionTM Locate Enables (Option 400 required)
MS27101A-0407  High-Speed Port Scanner

Hardware Option

Option Description
MS27101A-0001 Rack Mount Kit

Optional Accessories

Option Description
760-288-R Transit Case
2000-1371-R Ethernet Cable, 2.13m (7 ft)
2000-1528-R GPD Antenna, SMA(m) with 5 m (15 ft) cable, 3 dBi gain, requires 5 VDC
Getting Started

Connecting to the Remote Spectrum Monitor Using an Ethernet Network

Communication with the MS27101A is done via the GBit Ethernet port located on the instrument. Options are provided for using DHCP to obtain an IP address dynamically or for setting up a static IP address. The instrument is shipped with the default static IP address of Once a connection is made to the instrument via a laptop/PC, the IP type can be changed via the user interface presented by the monitor’s integrated web server.

For DHCP usage, Anritsu offers an Ethernet Discovery Program which queries your network for all connected devices. The Ethernet Discovery Program can be found on the Anritsu website.

Some customers may prefer to use a Domain Name Server (DNS) where the spectrum monitor’s hostname can be resolved into its dynamic IP address. A DNS server provides the ability to create a hostname. Examples might include hostnames such as “” or “”. There are several free DNS services available. One such service used by Anritsu is You will need to create an account and select a hostname for your instrument.

Further details about configuring your Ethernet connection can be found in our Ethernet Configuration Quick Start Guide available for download on the Library tab.

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