Incorporating all the necessary features for station setup, regulatory compliance, and remote monitoring, Inovonics' 551 HD Radio Modulation Monitor is the ultimate choice for advanced FM and HD Radio signal monitoring, whether you are at the transmitter site or halfway around the world. Simultaneously monitor in real time the off-air FM modulation along with up to 4 HD Radio Channels.
A high-resolution 7-inch TFT Touch Screen displays all the essential modulation data for accurate readings in a graphic format. The 551 collects the history of signal parameters and displays HD Radio™ album artwork, station logos and similar visuals on the front panel display and remote Web interface. The 551 includes a built-in BandScanner™, a real-time clock and full SNMP functionality
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. SNMP is fully supported.
- David K Peabody - BSL, LLC dba Broadcast Signal Lab
- Glynn Walden - Founding Partner and VP Engineering USADR/iBiquity
87.5MHz-107.9MHz in 100kHz steps
10dBuV required for 50dB mono-FM SNR, unweighted.
FM: Stereo / Forced Mono
HD Radio: HD1 through HD8
FM/HD1: ‘Split Mode’ delivers L+R FM to the left audio channel and L+R HD1 to the right.
FM: ±.1dB, 20Hz-15kHz
HD Radio: ±0.25dB, 20Hz-20kHz
FM: 60dB, 20Hz-15kHz
HD Radio: 90dB, 20Hz-20kHz
FM: <0.01% THD, 20Hz-15kHz
HD Radio: <0.003% THD, 20Hz-20kHz
FM De-emphasis: 75µs, 50µs or None, menu-selectable
‘Assignable’ outputs utilize XLR connectors, ‘Dedicated’ outputs are RJ45 jacks per StudioHub® spec. (model 551 only)
Balanced Analog: Left and Right outputs adjustable from –15dBu to +15dBu in 0.1dB steps; 200Ω source.
AES Digital: Adjustable from –30dBFS to 0dBFS in 0.1dB steps; 44.1kHz sample rate; 110 Ω transformer-coupled.
Dante/AES67 Compatible: (RJ45) Output at 44.1kHz (Dante-only) or 44.1kHz/
48kHz (Dante /AES67); AoIP utility has independent IP, Audio Format and Transmit Flow settings; level adjustable from –30dBFS to 0dBFS in 0.1dB steps.
Headphone Jack: (¼” TRS) with adjustable listening level.
Listening Stream: Web browser ‘remote listening’ stream uses HE-AACv2 encoding, 44.1kHz or 48kHz sample rate, bit-rates from 18kbps to 64kbps; accommodates up to 10 simultaneous listeners. HTTP/Icecast and raw UDP streams are available simultaneously.
Composite/MPX Output: (BNC) may be switched between MPX and 19kHz stereo pilot sample; adjustable from 1Vpp to 6Vpp in 0.05V steps.
LAN connection to local network or Internet provides remote monitoring, control, listening and full SNMP implementation; user-programmable network setup and streaming parameters.
Ten individual open-collector NPN transistor closures to ground are associated with alarm functions. Each is programmable for GPO assignment and logic polarity.
PS • PI • Call • RT • RT+1 • RT+2 • PTY • PTYN • CT • M/S • DI • TP • TA • AF • ODA • Block Error Rate • Groups & use statistics.
Overview: Short Name • Universal Name •
Station ID • Slogan• Message • Station
Location • Service Mode • TX Blend • Emergency Alert
Slogan • Program Type • Artist • Title • Album • Codec Mode • Bitrate • TX Gain • Logo/Artist Experience graphics and file details.
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: (simultaneously for HD1 and three other preselected HD programs)
L/R Audio • BS.1770 Loudness (absolute and relative to Analog FM Loudness).
FM/HD1 Alignment: Timing offset and level and phase discrepancies between programs; ‘Confidence Factor’ display.
Graphic Displays/Plots: RF Spectrum • MPX Spectrum • Audio Spectrum • Audio XY • Audio O’scope • FM Modulation History • Audio Level History • Metrics History • FM/HD1 Time & Level Alignment History • BandScanner™ utility.
Alarms: Most alarms have multiple parameter settings. All alarms can send text or email notifications. Alarms are also logged: daily, weekly, monthly._
Analog FM: Carrier Overmod • Audio
Loss • Low Signal • RDS Loss • PI Error • RT Update • Pilot Loss
HD Radio: HD Loss • Program Loss • Audio Loss • HD Power Level • FM/HD1 Alignment • PSD Update • Logo Receipt • Artist Experience Update • Image Issues • Emergency Alert Updates
Auto-sets to Internet time; auto/manual DST setting; battery backup.
32°F/0°C-122°F/50°C; 0%-95% non-condensing
relative humidity; 10,000ft/3048m
25”H x 17”W x 3”D; 8 lbs. shipping weight.