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      FM Modulation Monitor

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      Incorporating all the necessary features for station setup, regulatory compliance, and remote monitoring, Inovonics' 531N is the ultimate choice for essential FM signal monitoring. Dependable, direct input and off-air reception lets you keep a sharp eye on your total RF signal performance whether you’re right at the transmitter site or half way around the world.

      The high-resolution LED bargraph displays are easy to read, and a "floating dot" program peak marker eliminates any ambiguity in the total-mod measurement. Off-air readings are qualified by Inovonics' exclusive multipath indicator, which also aids in antenna alignment during initial station build-outs. In addition, readouts of signal strength and synchronous AM noise qualify the incoming signal and validate measurements.

      Synchronous AM Noise Monitoring – an exclusive with Inovonics.

      Rear-panel alarms constantly check for Audio Loss, RF Loss, Multipath and Overmodulation, while advanced notifications alert personnel with e-mail or SMS messaging when any or all of the alarms occur.

      "...The 531N is an excellent investment for stations looking for a state-of-the-art modulation monitor."

      "Checking it out...A Road Test of the Inovonics 531N for FM" - Barry Mishkind - Broadcasters' Desktop Resource

      Features


      • Complete set of metering and measurement tools to ensure FM broadcast regulatory compliance worldwide.

      • Separate inputs for Antenna, High Level ?direct? RF, and composite signal measurements.

      • Full-time display of Signal Strength and Multipath effects, plus Synchronous AM noise output (BNC) to validate readings and aid in antenna alignment.

      • Synchronous AM Noise Monitoring – an exclusive with Inovonics

      • Composite and Balanced analog Left and Right line outputs.

      • Front panel metering for subcarrier injection levels: 38kHz, 57kHz (RDS), 67kHz, & 92kHz.

      • Advanced Metering includes an FFT Spectrum Analyzer for the MPX, Left/Right XY plots and audio levels over time

      • Alarms for Peak Overmodulation, Signal Loss, Program Audio Loss and Multipath.

      • Rear-panel closures to ground enable remote alarm indications and preset station switching.

      • “Responsive” Remote Control Web interface with live audio streaming.

      • SNMP control and support.


        Online Demo Available

      Reviews

      The ability to remotely view and control the 531N is an essential capability for today. Our 531N FM Modulation Monitor has been essential in maximizing our modulation while keeping our station in compliance. The ability to quickly switch between 6 presets allows us to quickly compare our primary and translator signal levels, as well as compare to other station signal levels.

      - Ted Statnick - Chief Engineer @ WLMP, Milton, PA

      "The 531N is probably the most versatile broadcast monitoring equipment that I have purchased in my 13 years in broadcast engineering. I have never had any issues with it. I would highly recommend it to anyone who needs a reliable, easy to use FM modulation monitor. It is easy to install, and is so much more than just a modulation monitor!" "The 531N gives me piece of mind that I have our processors and transmitters set to peak effectiveness while still abiding by our licensing agreement. It is easy to setup and does a great job of monitoring our air-feed."

      - Nathan Owens. Caribbean Radio Lighthouse - Antigua

      Checking it Out - A Road Test of the Inovonics 531N for FM

      - Barry Mishkind Checking it Out - A Road Test of the Inovonics 531N for FM

      Specifications


      OFF-AIR RECEIVER SECTION

      Type

      Double-conversion superhet circuit with proprietary ultra-linear, noise-rejecting pulse-counting FM detector

      Tuning Range

      76MHz – 108MHz ?in 100kHz increments

      Station Presets

      6 user-programmable pushbutton presets; local or remote selection

      RF Inputs

      • F connector for 75-ohm antenna
      • BNC connector for high-level 50-ohm RF sample; 1V - 7V r.m.s.

      Receiver Sensitivity

      10μV (10dBf) for 50dB mono quieting; 250μV (60dBf) required for valid Total Modulation reading

      Receiver Selectivity

      ±0.25dB, 20Hz - 50kHz; –1.5dB or less at 100kHz (see Figure 1); –35dB (typ) at 200kHz (see Figure 2)

      Baseband Output

      BNC composite/MPX demod output; 3Vp-p at 100%-modulation.

      RSSI (Incoming Signal Level)

      Independent front-panel LED bargraph metering of the relative strength of the incoming carrier

      Multipath Distortion Measurement

      Independent front-panel LED bargraph metering of the relative degree of multipath reception-distortion effects

      AM Noise Measurement

      Front-panel metering may be switched to show the relative level of the incidental, synchronous AM noise component of the FM carrier. AM noise is routed to a separate BNC output and also monitored by headphones when selected.

      FM BASEBAND MEASUREMENTS

      Baseband Input

      Adjustable BNC composite/MPX input to stereo decoder and subcarrier measurement circuitry. Accepts 100%- modulation levels (typical 3V p-p) equating to ±75kHz carrier deviation.

      Composite/MPX Metering

      58-segment LED bargraph display has quasi-peak response with floating peak hold. Switchable between positive deviation, negative deviation and highest of either

      Meter Resolution

      1% accuracy between 80% and 100% carrier modulation; 2% resolution between 46% and 80% (100% = ±75kHz carrier deviation)

      Metering Integration

      User-selectable at 0.1ms, 0.2ms, 0.5ms and 1.0ms

      Meter Frequency Response

      +0/–1%, 10Hz - 100kHz

      Peak Flasher

      Programmable in 1% increments between 95% and 120% of total carrier modulation.

      STEREO DEMOD PERFORMANCE

      Switch-Selected Composite/MPX Input

      • Direct connection to the demodulated output of the offair receiver section
      • BNC connector accepts an external baseband input 3V p-p (adjustable) equivalent to full (±75kHz) carrier deviation

      Program Audio Outputs

      • Balanced XLR Left & Right channel stereo program outputs deliver +4dBm at 100% monaural modulation (±75kHz carrier deviation)
      • Front-panel headphone jack

      Demod Metering Display

      Dual LED bargraph displays show Left and Right or L+R and L–R demodulated program audio. The display is peak responding between +10dB and –30dB, and average responding between –30dB and – 64dB.

      Stereo Audio Frequency Response

      ±0.5dB, 10Hz - 15kHz

      Stereo Signal-to-Noise Ratio

      Unmodulated (stereo) carrier noise is better than 65dB below 100% modulation with de-emphasis applied.

      Distortion

      <0.075%THD at 400Hz 100% Modulation Mono. No De-Emphasis, unweighted

      Stereo Separation

      55dB, 50Hz - 15kHz with an external composite/MPX input. In the off-air mode, receiver selectivity limits separation to >45dB, 50Hz - 15kHz (see Figure 3).

      Stereo Crosstalk

      By the M/S or S/M (stereo-difference) method, >60dB, 50Hz - 5kHz, derated to >45dB at 15kHz with external composite/MPX input. In the off-air mode receiver selectivity limits crosstalk to >50dB, 50Hz - 5kHz, derated to >35dB at 15kHz (See Figure 4).

      Stereo/Mono Switching

      Mode switching is automatic with a front-panel indicator; monaural reception may be forced with a front-panel button or from the remote Web Interface.

      Program De-Emphasis

      May be turned on and off from front panel or Web Interface (indicator provided); internal jumper selects 50μs or 75μs characteristic.

      FM SUBCARRIER MEASUREMENTS

      Meter Scaling and Resolution/Accuracy

      58-segment LED bargraph display measures stereo pilot and subcarrier levels between 2.6% and 14% with 0.2% resolution and accuracy. Injection percentages refer to 100% = ±75kHz carrier deviation.

      Metering Characteristic

      Peak-responding in all modes

      Measurement Filters

      • 19kHz Stereo Pilot Tone
      • 38kHz Residual Stereo Subcarrier
      • 57kHz RDS/RBDS Data Subcarrier
      • 67kHz SCA Audio Subcarrier
      • 92kHz SCA Audio Subcarrier

      PROGRAMMABLE ALARMS

      Peak Flasher

      Ground-closure output gives remote indication coincidental with the front-panel Peak Flasher

      Program Audio Loss

      Front-panel LED and ground-closure (remote) alarm is programmable from the front panel to indicate when either stereo channel remains 10dB or more below 0dB for a period that may be set between 10 seconds and 2 minutes.

      Low Signal

      Front-panel LED and remote ground-closure alarm is fixed at a level of incoming RF signal below which modulation measurements are not valid.

      Multipath

      Front-panel LED and remote ground-closure alarm is fixed at a degree of multipath distortion above which modulation measurements are not valid.

      NETWORK PORT

      Rear Panel Connector

      An RJ45 jack accepts TCP/IP Network Connections for remote setup and operation.

      Settings

      DHCP or Static IP address can be set from the front panel.

      SNMP

      Supports SNMP remote monitoring and control (MIB file can be downloaded directly from the 531N)

      SMTP

      Supports email services with or without SSL.

      Dynamic DNS

      Supports dyndns.org, no-ip.org, and dnsomatic.com.

      MISCELLANEOUS

      Power Requirements

      105 - 130VAC or 210 - 260VAC, 50/60Hz; 20 watts

      Size and Weight

      3?”H x 19”W x 12”D (2U); 14 lbs. (shipping)

      Environmental

      Continuous operation at ambient temperatures between 32?F/0?C and 122?F/50?C; 0-95% relative humidity, non-condensing, altitudes to 10,000ft/3,048m.

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