The MS27102A is a remote spectrum monitor designed to both mitigate interference problems and to identify illegal or unlicensed signal activity. The MS27102A is offered in a weather-proof IP-67 enclosure for outdoor mounting in the harshest of environments. One RF Input is provided, although a second port can be optionally added for use with two antennas. MS27102A is a full featured platform for monitoring and recording signals in user specified frequencies.Capable of sweep rates up to 24 GHz/s, this probe 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 the MS27102A 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. 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 MS27102A can be utilized. These methods are highlighted below.
1. Integrated Web Server
An integrated web server is embedded into the MS27102A. 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.
2. SCPI Programming
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.
3. Vision™ Software
Vision™ software is also provided as an option for the MS27102A. 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.
- Vision Monitor (option 400)
- Vision Locate (option 401)
Vision Monitor automatically records spectrum data, maintains a searchable spectrum history database, enables alarm functions for unusual signal activity, automatically sends email alerts 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.
- 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
- IP67 rated for outdoor 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 RHz BW
- DANL: < -150 dBm referenced to 1 Hz RBW, 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
MS27102A is designed for outdoor environments. Typically these probes are positioned in a permanent or semi-permanent location for radio surveillance and monitoring. Government regulators often use outdoor monitors for enforcing spectrum policies. A typical use case might be using the 20 MHz instantaneous FFT bandwidth capability for capturing the entire FM radio band (88 MHz to 108 MHz). Users could then examine each frequency band for illegal broadcasts. 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
- Positive Train Control (PTC)