Inovonics Dante 551 Installation & User Manual Download

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by the

Mod Response:

buttons on the Webpages and LCD-

touchscreen

Setup/Radio

screens. The default selection is the

fastest,

50µs

setting, but more ‘forgiving’ selections of

100µs

200µs

500µs

and

1ms

are also available. We recommend the

more conservative default value, but it’s your call.
You should typically see negligible difference between positive

and negative deviation readings, reflecting only the asymmetry

normally encountered in speech and music waveforms. Con-

sistent discrepancies indicate a possible FM exciter issue.
These total-mod readings should not be affected by accompa-

nying HD Radio “IBOC” (In-Band On-Channel) programs. Great

care has been taken in the design of very selective IF filtering to

eliminate false indications of FM-overmod at any HD carrier-

pair injection ratio. Any observed interaction between analog

and digital program channels should certainly prompt further

investigation.

Pilot &

Subcarriers

This next section of the display screen first shows the injection

level of the 19kHz stereo pilot. On an FM station broadcasting

in stereo,

Pilot

should be a rock-steady reading at about 9.0%.

Composite clipping or other nonlinearity in the transmission

path can cause this reading to ‘bounce’ to a lesser or greater ex-

tent, these level perturbations showing up on the accompany-

ing

bargraph as amplitude modulation of the stereo pilot.

Early FM stereo exciters generated the FM baseband signal us-

ing analog multipliers, necessitating an adjustment procedure

for nulling the 38kHz carrier component. Today’s stereo-gens

don’t need this, yet the 551 gives a readout of 38kHz energy.

You shouldn’t see much action on the

38k

bar, yet music heavy

in sub-bass may cause this readout to flicker-on occasionally. A

steady-state reading or a great deal of bass-associated activity

hints at a stereo-gen problem.
The

RDS

readout gives the injection level of the RadioData sub-

carrier at 57kHz. Similar to the stereo pilot, this should be a

solid reading at about 5%. Program audio should not modulate

the amplitude of this reading at all. Variations in

RDS

level

again suggest transmission path nonlinearity or a problem with

the RDS encoder.

Summary of Contents for Dante 551

Page 1: ...551 Modulation Monitor Installation User Guide www inovonicsbroadcast com ...

Page 2: ......

Page 3: ...1 0 1 4 Release Inovonics Inc 5805 Highway 9 Felton CA 95018 Tel 831 458 0552 Register online at www inovonicsbroadcast com PRODUCT REGISTRATION RECORD 551 Serial No ____________________ Purchase Date _____________________ Warranty Registered via Web Reg Date __________ By ____________ ...

Page 4: ...se from iBiquity Digital Corporation U S and Foreign Patents apply For patents see http patents dts com HD Radio and the HD HD Radio and ARC logos are registered trademarks of iBiquity Digital Corporation in the United States and or other countries ...

Page 5: ...ntenna Input and Considerations 10 High Level Input 10 Multiplex or Pilot Sync Output 10 Program Line Outputs 10 Assignable Line Outputs 11 The Split Mode 11 Dedicated Line Outputs 11 StudioHub Interface 11 Analog Line Output Characteristics 12 AES Digital Outputs 12 AoIP Streaming Port and Levels 12 LAN Network Port 12 GPOs 12 Section III PREPARING TO CONNECT THE 551 FRONT PANEL Front Panel vs We...

Page 6: ... Specifying the Four Selected HD Programs 22 RF Input Selection 22 Mono Stereo 22 STATION ROTATION StationRotation Defined 22 FM LEVEL METERING FM Carrier Modulation 23 Pilot and Subcarriers 24 Demodulated FM Audio 25 FM Program Loudness 25 ITU R BS 1770 Loudness Measurement 26 Synchronous and AM Noise 26 HD LEVEL METERING HD Levels and Loudness 27 Relative HD Program Loudness 27 SPECTRUM PLOTS Th...

Page 7: ... Alarms 42 Low Signal Mute 42 RDS Alarms 42 RT Update 43 Threshold Independent Alarms 43 Pilot Loss 43 HD Loss 43 HD Program Loss 43 HD Power Level 43 FM HD1 Alignment 43 HD PSD Not Updated 44 HD Logo Not Received 44 HD Artist Experience 44 HD Image Issues 44 HD Emergency Alerts 44 Alarm Logging 44 SETUP Radio Settings 45 MPX Output 46 Assignable Program Outputs 46 Dedicated Outputs Defined 46 Ded...

Page 8: ...ante Controller 51 SNMP OPERATION Overview 51 Mode 51 Security 51 Ports 51 Trap Destinations 51 The MIB File 52 EMAIL Email and Text Notifications 52 SMTP Setup 52 Recipients Send To 53 Notifications Send What 53 TIME SETUP Time and DST 53 Presentation Formats 54 RTC Battery 54 Time Server 54 ADMINISTRATIVE MATTERS Security and Passwords 54 Signing In 54 Lost Password Hard Reset 55 The Hardware Pr...

Page 9: ...full SNMP remote control and monitoring Graphic front panel and remote display of all level metering FFT spectrum analysis of IF passband MPX baseband and pro gram audio oscilloscope audio XY and ITU R BS 1770 LU loudness displays Collects and logs a history of FM and HD Radio signal parameters Precise analysis of timing and level errors between analog FM and HD1 digital program channels Simultane...

Page 10: ...g XLR Left and Right outputs adjustable from 15dBu to 15dBu in 0 1dB steps 200 source AES Digital XLR Adjustable from RJ45 30dBFS to 0dBFS in 0 1dB steps 44 1kHz sample rate 110 transform er 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 ...

Page 11: ...story FM HD1 Time Level Alignment History BandScanner utility Alarms Most alarms have multiple parameter set tings All alarms can send text or email notifications Alarms are also logged dai ly 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 Re ceived Artist...

Page 12: ...st entirely DSP based Virtually all functionality is provided through firmware coding The Block Diagram presented below illustrates product basics in an easily under stood form although actual signal paths and logical functions may deviate appreciably from those depicted here Block Diagram of the Inovonics 551 HD Radio Modulation Monitor ...

Page 13: ...o receive specific service instructions or soft ware firmware updates when issued Register online at www inovonicsbroadcast com support productRegistration NOTE Many users choose first to familiarize themselves with equipment on the bench or at their desk in which case they may immediately turn to Section III that describes setup and use of the 551 monitor When the time comes do please refer back ...

Page 14: ...ement INPUTS OUTPUTS AND PORTS Antenna Input and Considerations The rear panel ANTENNA connector is a female 75 ohm F con nector While the F is a common standard in the US adapters to other connector types are readily available worldwide Factors guiding your selection of an antenna will include the level and purity of the off air signal Selectivity of the 551 is remarkably good but as a wideband r...

Page 15: ...Dedicated program line outputs refer to the split row of RJ45 jacks on the 551 rear panel Five dedicated ANALOG OUTPUTS and five dedicated AES3 DIGITAL OUTPUTS each include the FM and HD1 main program channels plus the preselected HDA HDB and HDC programs assigned under the Now Playing Webpage menu Levels for these outputs may be adjusted ei ther on the Setup Dedicated Outputs Webpage menu or the ...

Page 16: ...treaming Port and Levels The Dante compliant AoIP Audio over Internet Protocol out puts appear at the rear panel RJ45 AoIP PORT with simultane ous transport of FM HD1 HDA HDB and HDC program chan nels This port is independent of the 551 LAN PORT network connection and its casual streaming utility Dante AoIP streaming first requires basic Dante setup under the Webpage or LCD Dante menus as detailed...

Page 17: ...it s IP address so some familiarity with the front panel is useful Powering Up Boot startup time of 551 is just under ten seconds When power is first applied or following a power interruption the unit is back in full operation in short order Setup and recep tion parameters in effect previous to a power glitch are reload ed instantly from non volatile memory into the processing core The LCD Touchsc...

Page 18: ...eak Hold independently sets brightness of the hang ing segment representing the highest peak registered Use your finger to push the slider left and right or click the and but tons to fine tune your setting Similarly for the LCD display itself Brightness controls the back light Timeout sets the time that the display will remain on after you finger leaves the screen Checking the Dim on timeout box w...

Page 19: ... can be accessed from a computer tablet or phone anywhere in the world but first your network needs to be set up to make this possible This process is addressed in the Networking section later in the manual Finding the 551 IP Address With both your computer and the 551 plug ged into your LAN and both turned on go to the 551 LCD touchscreen and touch the menu icon in the upper left corner Next touc...

Page 20: ...creen image on the previous page the default Hostname is MODEL551 This name may be changed to a more convenient or personalized identification of the unit as may be required to differentiate between multiple units on the same LAN When you have connected you will see the Now Playing Webpage Starting at this point in the manual most setup and operating discussions and instructions will use the Webpa...

Page 21: ...al Webserver that contains multiple interactive pages or menus for setup and operation of your unit These pages give ready and interactive access to all settings readouts graphics audio monitoring and alarms Now Playing is the landing home Webpage initially presented as shown fully unfurled here ...

Page 22: ... Responsive Webpages The responsive 551 internal webserver provides an optimal viewing experience across a wide range of devices desktop computers tablets and mobile phones Specific to the device as the image size varies the Webpage is reconfigured to give the best view THE WEBPAGE HEADER Each of the 551 Webpages carries the header shown here Monitor ID At the left the hostname of the 551 identifi...

Page 23: ...yer at the desired audio stream as shown in the example that follows Streams are identified for this purpose as stream0 stream1 stream2 stream3 and stream4 corresponding to the programs shown in the drop down listening menu above respectively A browser address bar could resemble this exam ple NOW PLAYING The Now Playing Webpage was shown complete on Page 17 This page and several of the others requ...

Page 24: ...n by the receiver and the DQ readings for each of the preselected HD Radio program are confidence readings in per cent again based on ideal reception As just witnessed much of the HD Radio terminology has been coined by the system developers and may not be familiar within all broadcast engineering circles For an in depth discussion of the HD Radio system the reader is first directed to the relevan...

Page 25: ...frequency display at the left of the slider Station Presets The 551 offers thirty station memory presets Once tuned to a station click Save as New This will open a box where you can enter call letters or a short street name for the station Then click Save in that same box and your entry will be entered at the bottom of the Preset Stations list Presets are cleared from the list by clicking on the X...

Page 26: ...LEVEL RF INPUT The high level BNC input is generally used when a direct connection to the transmitter is preferred over off air signal reception On the Tuner Webpage menu Antenna or High Level may be se lected under RF Input This selection also becomes a part of the Preset Stations data allowing high level input selection for your own station and off air reception for others should you wish Mono S...

Page 27: ...etup considerations when using the StationRotation feature 551 alarms generally have time on time off settings that will directly impact the Rotation Time Sec setting See the Alarms discussion beginning on Page 26 The on off times may be quite different between normal single station and StationRotation operation The Status display gives a second by second countdown of ro tation time Keep in mind a...

Page 28: ...ws the injection level of the 19kHz stereo pilot On an FM station broadcasting in stereo Pilot should be a rock steady reading at about 9 0 Composite clipping or other nonlinearity in the transmission path can cause this reading to bounce to a lesser or greater ex tent these level perturbations showing up on the accompany ing AM bargraph as amplitude modulation of the stereo pilot Early FM stereo ...

Page 29: ... R stereo difference levels have the same ballistic characteristics and scaling as the Left and Right meters above them This dynamic sum and difference metering gives a better visual representation of stereo separation with program audio Note that in the example above Left and Right levels are less than a dB apart yet the L R and L R meters indi cate reasonable stereo activity The fact that Left a...

Page 30: ...e display represents the level range considered in this calculation and provides a quick visual of program dynamic range S The green segment is a short term integrated value de rived from a 3 second block of audio refreshed every second This yields a readout primarily indicating the loudest sections of program audio I The blue segment is a longer term integrated measure ment and is gated to ignore...

Page 31: ...ent e g HD2 HD3 etc If one or more of these displays has not been assigned an HD channel it will default to an HDA HDB or HDC callout and show no activity Relative HD Program Loudness Long term average loudness of the station s active HD Radio programs is shown on the HD Loudness Relative to FM display Zero LU on this meter scale represents the LU value of the host analog FM program Thus both the ...

Page 32: ...h signal selected for viewing carries its own family of graph setup options below the display The IF Spectrum The illustration shown here is the receiver s IF spectrum 0kHz represents the carrier frequency of the currently tuned station The display has been Normalized under View Options to reference 0dB as the unmodulated FM carrier level HD Mask may be set at the figures shown the 20dBc choice in...

Page 33: ...e yields a sta ble and meaningful display and the de fault 10 FFT Averages proves a good compromise for a display that is both dynamic and easy to read Selecting Peak will reveal peak levels of the spectrum components and Hold accumulates the highest peak value for as long as it remains selected Audio Spectrum Display Select Audio at the top to present a spectral display of left and right program ...

Page 34: ...e activated by default and as pictured all four parameters are displayed above in various colors If a particular display is con fusing you can easily turn off those parameters you don t want to see The Time Span selected here is 1 Minute That means that the rolling display shows the last 60 seconds of activity For a time study over a longer period you may select a window that shows up to the last ...

Page 35: ... Metrics We could hope that the RF Metrics History Webpage would be the least interesting of the bunch as these are re ception metrics that ought to be rock solid This station is not one of the strongest in the area showing some variation in RSSI and RF SNR The HD Radio parameters do exhibit their expected stabil ity however which is good Audio History Left and right chan nel program audio lev els...

Page 36: ... LU scale is continually adjusted to the FM audio loud ness The Absolute selection will show the FM program together with the HDs but against absolute LU values OSCILLOSCOPE A built in oscilloscope utility has been included for viewing au dio and other waveforms through either the Webpages or the LCD touchscreen displays Vertical sensitivity is scaled and an notated with respect to the 100 modulat...

Page 37: ...his case Points and Persistence were both engaged to also indicate the short term trend of the stereo image FM AND HD1 ALIGNMENT We ve discussed how the 551 can correlate level differences be tween the analog FM and digital HD1 programs but the HD Ra dio system also requires very tight time alignment between the two program channels as well The 551 is able to correlate this metric and can even dis...

Page 38: ... Units setting at the bottom of the screen The lower graph plots HD audio Peak and Loudness against time normalized to analog FM audio parameters Select which mea surements to Show set Delay Units and Time Span here too THE BANDSCANNER UTILITY The 551 BandScanner is an annotated RF spectrum analyzer utility that is able to graphically display the entire FM band From the front panel BandScanner is ...

Page 39: ...can bar at the bottom of the page Step Size defaults to 200kHz 100kHz steps are also available In the example scan above every FM carrier found is represent ed by a vertical bar Bar height indicating signal strength in dBµV per the annotation along the left side This was an RSSI RDS HD scan had it been done in the simple RSSI mode all stations would show up as yellow bars Bars and Dots Hovering ov...

Page 40: ... number of HD stations found again by ascending Frequency and which HD Radio Pro grams are being transmitted The station short Name the RSSI reading and the Cd No figure denoting relative quality of the digital signal are presented there too The Cd No notation is color coded in this list A value greater than 57 solid HD Radio reception will be green an orange number is iffy and a red one generally...

Page 41: ...rrent ly playing The two to the right are album art for the previous two songs Click the little dots below the Artist Experience images to scroll through previous Artist Experience graphics Then hover over any image to bring up image specifications as shown in the right hand screenshot above These specs define the received image file Image Error Reporting 551 diagnostics alert you to an image that...

Page 42: ...nd under the Programs heading on the HD Info Webpage RDS AND HD METADATA RDS Info This 551 Webpage presents a comprehensive display of the RDS information that accompanies analog FM transmissions The upper area of the screen shows the most important blocks of RDS data These include the static or scrolling PS the PI Code either assigned or in the US and Canada derived from the Callsign RadioText an...

Page 43: ...al station specifics on coding and transmission as well as showing the particulars on any Emer gency Alert that is being transmitted at the moment The Programs area of the screen supplies information pertinent to the programming of each HD Ra dio channel being transmitted Current program station logos and album art for all HD channels are presented at the top of this dis play area and then each HD...

Page 44: ...amps head the Alarms Webpage and also appear on the Now Playing Webpage Set the Clock Alarms are logged with time and duration stamps Be sure to select the time zone and ensure that the 551 is sync d with In ternet time This is explained shortly Important When an alarm or multiple alarms have been set with a station tuned in those settings will apply to any other station manual ly tuned However in...

Page 45: ...ned Off there will be no indicator on the Now Playing or Alarm Webpages no closure at a rear panel GPO terminal nor will the 551 send SMS text or Email alerts to station personnel or log the alarm This applies to all alarms Mod displays the total modulation level of the off air pro gram being received This is grayed out because there is no adjustment in this case Levels displayed in these grayed o...

Page 46: ...oth level and time settings that will trigger and reset an alarm Low Signal Mute The Low Signal alarm has one feature that the others in this group don t Mute may be set On to mute program audio when the alarm is active triggered and not yet reset cleared HD channels will mute themselves but FM audio will naturally pitch a hissy fit when the carrier disappears RDS Alarms There are two Off or On se...

Page 47: ...dual HD channels again loss of the complete program channel not just loss of audio The Alarm button array selects the channels to be monitored for loss Time On sec and Time Off sec settings apply to any and all channels selected HD Power Level The power level of the HD Radio signal is expressed in dBc or dB below the resting level of the host FM carrier Subject to the station license levels can be...

Page 48: ... all HD chan nels may be selected to trigger an alarm The programmed Time On Min applies to all channels selected HD Artist Experience This alarm parallels the HD Logo alarm just described except that it relates to Artist Experience graphics instead of the sta tion Logos HD Image Issues As explained on Page 37 the 551 has built in diagnostics to in dicate that Logo and Artist Experience graphics m...

Page 49: ...e Webpages Items specific to the Setup page will be dis cussed in order here Radio Settings 75µs is the default De Emphasis setting but may be manually changed here to 50µs the standard for Europe and some other regions outside North America or to None as might be required for test purposes RDS RBDS sets the mode for RadioData to the North American RBDS or the European RDS standard The default set...

Page 50: ...d the Assignable Digital Output Lev el dBFS slider between 30 and 0 Other information regarding these outputs is found on Page12 Dedicated Outputs Defined Dedicated outputs refer to the FM HD1 and the selected HDA HDB and HDC program channels that are available simultane ously Selection is explained on Page 22 These outputs are available again simultaneously as left right analog AES3 digital and a...

Page 51: ...551 fea ture is the ability to add in a fixed Audio Latency Sec delay to the inevitable delay inherent in transport This provides more data ready to go upon connection in turn helping the client s buffer to fill and playback to start faster Although the 551 can accommodate as many as 10 simultane ous Web listeners this number can be truncated in the interest of better streaming service to fewer au...

Page 52: ...liver ground on that terminal all the time and then go Active Open ungrounded when the alarm is re ceived The Status line in this example shows Output 1 is Inactive that is the assigned Audio Loss alarm has not been tripped Any of the alarm conditions could have been assigned here in the Type field Choose those that are most important to you and assign them to the GPOs NETWORK SETUP AND INTERNET A...

Page 53: ...ystem you may access 551 Web pages on a common LAN by typing its Hostname and a for ward slash into the browser address bar as shown here This entry is not case sensitive Non Windows browsers may require you to enter the complete IP address of the unit which you can always find by navigating to the front panel Network menu Incoming Internet Access To dial into the 551 from the Internet the unit mu...

Page 54: ...rates this setting is discussed shortly The AES67 Standard specifies a 48kHz sample rate but 44 1kHz is a rate with wide use in radio and television broadcasting and is the default rate for the 551 With AES67 Enable set to Enabled streaming is forced to a 48kHz sample rate The AoIP MAC Address The MAC address for AoIP streaming is not the same as the one for general Web interactivity of the 551 th...

Page 55: ... to the SNMP Manager This is detailed later on Mode The SNMP submenu default Mode setting is Disabled which in hibits communication between the 551 and the SNMP Manager Changing Mode to Read Only allows the 551 to be interrogated by the SNMP Manager so that programmed setup parameters alarms etc can be integrated with other equipment on the net work Setting the Mode to Read Write allows the SNMP M...

Page 56: ...MTP Settings You need to set up an actual email account the elements of which are just like setting up any conventional email account Information to be entered here depends on the provider you choose When you apply for the account much of this information will be assigned to you Consult your IT pro fessional for setting up email accounts if you need to Under SMTP Server enter the provided outgoing...

Page 57: ... reported or alarm logs dispatched to that individual In this abbreviated example the Chief Engineer will receive a text message on his phone for Overmod and Low Signal alarms When you ve finished with this Recipient proceed to the next No Save command is necessary in this oper ation TIME SETUP Time and DST The onboard Real Time Clock updates from Internet Time daily and has suffi cient inherent p...

Page 58: ...curity heading of the Admin Webpage type in the Front Panel password which then must be manually entered at the front panel screen at the equipment site There are two Webpages access passwords Web Admin Password Read Write is the Administrator password that allows full ac cess to the 551 Web User Password Read Only allows the lower level user to view all data but those users cannot retune the re c...

Page 59: ...Loaded Factory Default settings heading the boot sequence list The Hardware Profile The entire 551 setup may be saved to your computer as a small text file The Hardware Profile includes user settings alarm notification preferences SNMP options passwords etc and is useful for restoring a previous setup or for cloning a second unit for backup service To save a profile to your com puter under Configu...

Page 60: ...ating Firmware 551 firmware includes the Web interface pages and updates are easily uploaded to the unit when issued by Inovonics NOTE We recommend saving a fresh Hardware Profile as a firmware update may affect user settings If there is danger of compromising stored data the firmware update will include notes to that effect Updates are issued as small bin files which may be downloaded to your com...

Page 61: ...uded in the firmware About Info The bottom of the Admin screen shows the Serial Number of your 551 gives the current Firmware Rev and displays the Uptime or how long your 551 has been running since power was last ap plied You also may click Check for Updates to see if a new ver sion of the firmware has been issued and view Open Source Li censes boilerplate ...

Page 62: ... 58 ...

Page 63: ...tion label has been removed or altered III TERMS OF WARRANTY Inovonics Inc products are warranted to be free from defects in materials and workmanship A Any discrepancies noted within THREE YEARS of the date of delivery will be repaired free of charge or will be replaced with a new or remanufactured product at Inovonics option B Parts and labor for factory repair required after the three year Warr...

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