Radio Explorer

Mobile FM Radio Analyzer

Multifunctional, Easy-to-use, Exceptionally Reliable

The Radio Explorer is an excellent tool for onsite setup and analysis of broadcasting equipment. This unit can measure all the important parameters of the FM transmissions and displays them on the large LCD display. For even better control, the device can be connected to any Windows PC via a front panel USB port.

The Radio Explorer can be set to measure up to 50 preselected channels. When the data collection is over, the collected log files can be converted into .kmz format and displayed in Google Earth using the supplied free-of-charge Windows software. Thus, you can acquire a clear display of the station’s current condition. Such functionality is matchless when analysis and tune-up of the broadcast equipment and antennas is needed. The Log file can be exported as an intermediary format for future analysis. In addition, the band scan mode guarantees real-time display of the FM band or a fraction of it with down to 5 kHz resolution.

Multifunctional, Easy-to-use, Exceptionally Reliable
  • FM Band 87÷108 MHz Basic Spectrum Analyzer
  • MPX, PILOT & RDS deviation meters
  • Built-in Stereo decoder; Stereo Presence Detection
  • LEFT and RIGHT demodulated audio level meters
  • Measurement results visualisation in Google Earth
  • Accurate front-panel metering for local use
  • Headphones audio output with volume control
  • Full control and monitoring via USB connection
  • RF and RDS Measurements (real time & average)
  • Built-in 50-channels GPS Receiver
  • RDS and RBDS decoder
  • FM/RDS/RBDS Data Logger
  • RDS/RBDS Stream BER meter
  • Metal Case for high RF immunity
  • Very Intuitive Application Interface

The Radio Explorer is a multifunctional, easy to use tool, designed to evaluate FM broadcast band congestion and to measure and store all important radio broadcast parameters in a Log file. This is a stand-alone solution for running surveys - no other additional tools are needed. You can setup for observation up to 50 preselected channels. All you need to do is to get Radio Explorer in the vehicle and go. When your campaign is over just use the supplied free of charge Windows software to convert the log files into KMZ format and visualize the stored data in Google Earth. Thus you can "get the picture" of what really happens in the field, to outline the coverage of every station compared to competitors'. Such functionality is irreplaceable when you need to analyze and tune your broadcast equipment and antenna. The Log file can be exported also as a transitional format for future analysis or could be kept in record.

With a click on the button the Radio Explorer becomes an excellent tool for analyzing and setup of the whole broadcast equipment on the site. It can measure RF level, MPX deviation, Left & Right Audio levels, RDS and Pilot injection levels and display the measurements on large, easy to read LCD display. Easy switching between RDS/RBDS standards and measurement units makes Radio Explorer a suitable choice for broadcast engineers from all around the world. For even better control and data representation connect the device to an ordinary Windows PC, via a USB port. You can choose between various bar-graphs, data plots, histograms and etc. A super-fast band scan mode is available and gives you real-time live visualization of the whole FM band or just a small part of it with down to 5 kHz resolution. All of the device's or the campaign settings you can do by using software or via very intuitive and sample user interface with 5 buttons and LCD screen.

The Radio Explorer incorporates a high quality FM front end with all MPX signal and RDS parameters data logger and high sensitive GPS receiver in reinforced steel box. Additional MPX input is available for monitoring as well as MPX output, left and right "program output" and AES/EBU digital audio output. The inputs are for FM and GPS antennas and for power supply. The program received can be monitored with headphones plugged into a standard 1/8" jack with electronic volume control.

RF Input
Tuning Range87 to 108 MHz
Tuning Step50kHz (5 kHz in Band Scan Mode)
Tuner Sensitivity40 dBµV
Antenna PortsBNC Connector, 50Ω
Antenna Ports IsolationNo
Internal AttenuatorNo
Dynamic range 0 to 90dBµV; 20 dBµV (-87 dBm) for monaural; 43.5 dBµV (-63.5 dBm) for stereo
FM Demod
IF Filter Bandwindthfixed 150 kHz
Frequency Response±0.5 dB, 10 Hz to 40 kHz
MPX PowerNo
Dynamic range> 80 dB
Stereo Decoder
Frequency Response (L and R)±0.5 dB, 20 Hz to 15 kHz; follows selected de-emphasis curve
De-emphasis50 µs or 75 µs, Selectable
SNR (Stereo)>50 dB, 50 µs de-emphasis
THD<0.3%, 10 Hz to 15 kHz, 50 µs de-emphasis
Separation> 35 dB
Crosstalk> 40 dB
FFT Spectrum Analysis (RF, Composite, Audio)
Signal SourcesNo
FFT lengthNo
Dynamic rangeNo
Scope Analysis (RF, Composite, Audio)
Signal SourcesNo
Record lengthNo
Dynamic rangeNo
Metering Accuracy
RF Level±3dB, 0 to 80dBµV
MPX PowerNo
Total, Pos, Neg±3 kHz, 0 to 130 kHz, 0.1 kHz resolution
Pilot, RDS±0.5 kHz, 0 to 15kHz, 0.1 kHz resolution
Audio±2 dB, +3.0 to -35.0 dB, 0.1 dB resolution
Audio (L, R)+15 dBm, 600Ω, XLR (on rear panel, adjustable)
AES3 (L, R)5.0 Vp-p, 110Ω, balanced XLR Connector
Headphone3,5mm (1/8") Phone Jack
Communication Interfaces
USBB-type Connector
Ethernet 10/100 Base-TNo
RDS Decoder
StandardsEuropean RDS CENELEC; United States RBDS NRSC
Error Correction & CountingYes
AF DecodingYes
CT (Time/Date)Yes
RT (Radio Text), RT+Yes
PS (Program Service name)Yes
Group AnalyzerYes
BER AnalyzerYes
Group Sequence DisplayYes
RDS RAW Data DisplayYes
GPS Receiver
Number of channels50
AntennaPre-amplified, 5m of cable, magnetic
ConnectorSMA, rear panel
Measurement Storage
Storage2GB Build-in Memory Card
Data formatproprietary binary files
Power Requirement
Voltage12 DC (11-15V) / 2A max at 12V
ConnectorXLR (on rear panel)
Size and Weight
Dimensions (W;H;D)216 x 89 x 190 mm
Shipping Weight470 x 180 x 310 mm / 4.9kg
Frequently Asked Questions
  • Should I use an attenuator with Radio Explorer when I am close to a transmitter site?
    Radio Explorer has a highly sensitive front end. When you are close to a transmitter site (less than 2 km, for example) we recommend an RF attenuator to be used with the product. Thus, better performance will be achieved and saturation of the input RF front end stage will be prevented/eliminated.
  • My survey has too many points. How can I have a quick preview with fewer data points?
    The number of measurement points can be reduced while reviewing the survey via Google Earth. Prior to visualizing the log file, the following settings via the Radio Explorer Software should be applied.
    Go to Settings > Google Earth > Refine Settings section then apply the needed settings:
    Enable Refine - Enables refine settings to be applied with Visualization in Google Earth.
    Ignore Stacked Points with Distance Below - Points are defined as Stacked when length distance between them is below assigned. For example: If speed is quite low, then the result will be Stacked Points. Entering zero value will ignore Stacking despite Enable Refine option.
    Split Path when Point-to-Point Distance is Above - Distance between two points is measured in length units as well in time units. In contrast to length distance, time distance defines Path Splits. Path Splits are ‘dead zones’ in the Path, where data cannot be obtained.
    Ignore Points with Accuracy Above - With every point recorded there is corresponding accuracy value. Accuracy used here (as a term) is not coefficient, but deviation in length units. To eliminate inaccurate points specify value near to zero. Entering zero value will ignore Accuracy despite Enable Refine option.
  • Can I export and view the collected with Radio Explorer data as CSV or TXT?
    Radio Explorer stores the collected data in binary format (non readable). Thus, CSV and/or TXT formats are not available. The information could be exported and visualized into KMZ format using Radio Explorer Software.
  • I cannot receive any GPS information in the GPS menu of my Radio Explorer, what could be the problem?
    Sometimes the GPS receiver needs several minutes to initialize (update) its satellite table. That could be the reason why satellites are not indicated as soon as you have connected the antenna to your receiver. Also, select a suitable location for installation that allows routing of the antenna cable to the Radio Explorer and also provides a clear view of the sky for a good satellite reception.
    Please note that the GPS works at his best outside, not inside buildings. When you are in narrow streets, without clear view of the sky, good satellite reception will not be received. Also, check your GPS antenna cable, to make sure it hasn’t been damaged by closing a door.
  • How do I select the proper operation mode to be used during a campaign?
    Depending on the observation purposes, Radio Explorer utilizes two modes of operation:
    • LOGGER MODE - used for on-field configuration and observation of one or multiple preselected frequencies (Up to 50);
    • PI/CALL CAMPAIGN MODE – uses PI/CALL for preforming complete station surveys (Up to 10 stations can be chosen);
    Radio Explorer is a easy to use tool, designed to evaluate FM broadcast band congestion and to measure and store all important radio broadcast parameters in a Log file. Each mode measures all mandatory parameters and stores them in a Log file. Thus, the user always gets full information of the current condition of the chosen frequency/channel. Once the Log files are downloaded the unnecessary measurements could be filtered upon viewing.
  • I have imported a campaign in Google Earth - visible path and almost no points. What could be the problem?
    This problem is related to Google Earth. For further information, please take a look at the picture below or read Google Earth User Guide, section Time Slider.
    Google Earth can visualize only a fraction of the entire time period. The points are there, but are not visualized (depicted) in Google Earth. When no points are selected the program will hide and reset the Time Slider.
    We recommend you to animate the movement along the path or to extend the Time Slider at its full size as shown below.
    NOTE: The time slider feature is available only in Google Earth 5 and later.
    Click to Enlarge
    Click to Enlarge