Inovonics 531-N
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Inovonics 531-N


FM Modulation Monitor

BSW PART: 531-N

Inovonics 531-N


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. 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.
 
Want to see the web interface for the 531-N, in action? Control and view the features, LIVE! Click here to check it out!

Main Features:
• Complete set of metering and measurement tools to ensure FM broadcast regulatory compliance worldwide.
• Separate inputs for Antenna, High Level ʻdirectʼ 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.
• 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.

Specifications:
• OFF-AIR RECEIVER SECTION
• Type: Double-conversion superhet circuit with proprietary ultra-linear, noise-rejecting pulse-counting FM detector.
• Tuning Range: 87.9MHz to 108.1MHz in 100kHz increments.
• Station Presets: 6 user-programmable pushbutton presets; local or remote selection.
• RF Inputs: 1) F connector for 75-ohm antenna. 2) 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 of typical 3V p-p equating to ±75kHz carrier deviation.
• Composite/MPX Metering: 58-segment LED bargraph display has quasi-peak response with floating peakhold. 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: 1) Direct connection to the demodulated output of the off-air receiver section. 2) BNC connector accepts an external baseband input 3V p-p (adjustable) equivalent to full (±75kHz) carrier deviation.
• Program Audio Outputs: 1) Balanced XLR Left & Right channel stereo program outputs deliver +4dBm at 100% monaural modulation (±75kHz carrier deviation). 2) 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 deemphasis 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 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: 1) 19kHz Stereo Pilot Tone 2) 38kHz Residual Stereo Subcarrier 3) 57kHz RDS/RBDS Data Subcarrier 4) 67kHz SCA Audio Subcarrier 5) 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. 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; fixed at a level of incoming RF signal below which modulation measurements are not valid.
• Multipath: Front-panel LED and remote ground-closure alarm; 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: 3½”H x 19”W x 12”D (2U); 14 lbs. (shipping).
• Environmental: 0°C - 50°C operating temperature range; 95% non-condensing relative humidity; up to 3000 meters AMSL.

List Price: $3,200.00
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