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Inovonics 551

FM and HD Radio Modulation Monitor


Original price was: €9,645.Current price is: €9,185.

SKU: 108274


The Inovonics 551 HD Radio Modulation Monitor is designed to provide comprehensive monitoring and analysis of FM and HD Radio signals, offering features for station setup, regulatory compliance, and remote monitoring. Here’s an overview of its features and specifications:


  1. Signal Monitoring:
    • Monitor off-air analog FM and HD Radio signals (HD1-HD8) simultaneously in real-time.
    • High-resolution 7-inch TFT Touch Screen for displaying modulation data and visuals.
    • Collects history of signal parameters and displays HD Radio™ album artwork, station logos, and visuals on the front panel display and remote Web interface.
  2. Alarms and Notifications:
    • Front-panel alarms and rear-panel tallies for Audio Loss, Low Signal, RDS Errors, HD Loss, and more.
    • Advanced notifications via email or SMS messaging when alarms occur.
    • SNMP support for monitoring.
  3. Spectrum Analysis:
    • Spectrum graphs include RF Baseband, MPX, and Left/Right Audio.
    • O-Scope views for MPX, Pilot, RDS, and all Audio Channels.
  4. Audio Outputs:
    • Program Audio Outputs available as Balanced Analog, AES Digital, Dante/AES67 Compatible, and a headphone jack.
    • Web browser ‘remote listening’ stream available for up to 10 simultaneous listeners.
  5. General Specifications:
    • Tuning Range: 87.5MHz-107.9MHz in 100kHz steps.
    • Antenna Input: 75-ohm (F), High-Level RF Input: 50-ohm (BNC).
    • Sensitivity/SNR: 10dBuV required for 50dB mono-FM SNR, unweighted.
    • Reception Modes: FM (Stereo/Forced Mono), HD Radio (HD1 through HD8).


  • Off-Air Frequency Response:
    • FM: ±.1dB, 20Hz-15kHz
    • HD Radio: ±0.25dB, 20Hz-20kHz
  • Stereo Separation:
    • FM: 60dB, 20Hz-15kHz
    • HD Radio: 90dB, 20Hz-20kHz
  • Distortion:
    • FM: <0.01% THD, 20Hz-15kHz
    • HD Radio: <0.003% THD, 20Hz-20kHz
  • Program Audio Outputs:
    • ‘Assignable’ outputs utilize XLR connectors, ‘Dedicated’ outputs are RJ45 jacks per StudioHub® spec.
    • Balanced Analog: Left and Right outputs adjustable from –15dBu to +15dBu in 0.1dB steps.
  • Bargraph & Numerical Level Metering:
    • Analog FM: Carrier Modulation, Stereo Pilot & Subcarriers, Demodulated L/R & L+R/L-R, Stereo Separation, Stereo Crosstalk, BS.1770 Loudness, Synchronous & AM Noise.
    • HD Radio: L/R Audio, BS.1770 Loudness.
  • Alarms:
    • Various alarms for Analog FM and HD Radio signals with multiple parameter settings.
  • Real-Time Clock:
    • Auto-sets to Internet time with battery backup.
  • Power Requirement:
    • 88-264Vac, 18W.
  • Operating Environment:
    • 32°F/0°C-122°F/50°C; 0%-95% non-condensing relative humidity.
  • Size and Weight:
    • 25”H x 17”W x 3”D; 8 lbs. shipping weight.

The Inovonics 551 HD Radio Modulation Monitor provides broadcasters with advanced capabilities for monitoring and analyzing FM and HD Radio signals, ensuring regulatory compliance and signal quality.