Web UI MPX Screen

MPX Screen

The MPX screen displays header meters, the MPX Spectrum and MPX Scope meters in the next panel, Monitor controls and a block diagram with menu tabs in the middle panel, and controls for the selected menu in the bottom panel.

From this screen, you can configure FM composite output options, basic RDS settings, stereo generation, and routing of the resulting composite signal to physical and IP-based outputs.

MPX Spectrum and Scope

Middle Panel

Current I/O Config: Shows the currently selected I/O configuration.

Floppy Disk Icon: When hovered over, displays custom presets and their commands:

• Save As: Opens a dialog for saving a user preset. Enter a custom name in the Preset Name field and any relevant notes in the Notes field.

• Import: Lets you navigate to and import a user preset previously exported from an Omnia XII system.

• Export: Exports the user preset as a .json file to the download folder configured on your computer.

• Trash Can: Opens a Delete dialog for deleting the user preset.

Monitor

• Drop-down menu: Selects the point in the Omnia XII signal path used for monitoring. Options include:

  • FM Output: The fully processed, final audio signal designated for the FM transmitter analog air-chain. It includes final multiband limiting, pre-emphasis, and the effects of the FM clipper.

  • HD Output: The final processed audio signal meant for the digital HD Radio/DAB or streaming air-chain. Because digital codecs do not use pre-emphasis and are highly sensitive to clipping distortion, this path bypasses the FM pre-emphasis and final clipper, routing instead through the dedicated HD final limiter.

  • PreProc Out: The raw audio directly after initial input gain stages, and before any core leveling or automatic gain control occurs. Because it strips away the processing, monitoring this point acts as an operational bypass control to evaluate the untouched input source audio.

  • WBAGC Out: Audio tapped immediately after the Wideband Automatic Gain Control stage. This is the first level-leveling stage that smoothly rides long-term input variations before splitting the audio into separate frequency bands

  • MBAGC Out: The collective, blended output of the five-band Multiband Automatic Gain Control. This lets you hear the combined effect of all five frequency compressors balancing out the overall texture and spectral consistency of the program material before it enters the final peak limiters

  • MBAGC Out B1: This option taps exclusively Band 1, which handles the lowest frequencies (Sub-Bass / Heavy Bass).

  • MBAGC Out B2: This option taps exclusively Band 2, which governs the Mid-Bass / Lower Midrange frequencies.

  • MBAGC Out B3: This option taps exclusively Band 3, which governs the critical Midrange frequencies (where human speech and primary vocal presence reside).

• Level fader: Adjusts the Monitor level. Click and drag the fader to the left to decrease the level or to the right to increase it.

• Level field: Sets the Monitor level. Click the field, enter a value, and press Enter.

Control Blocks

[RDS Gen]

The RDS Gen block opens the RDS Dashboard page, which provides tabs for RDS Dashboard, Basic RDS, Metadata, and Settings. Each page includes the same tabs for navigation and a Back button to return to the MPX screen.

• RDS Dashboard: The dashboard displays RDS information configured on the other RDS pages.
  

  

• Basic RDS

  Basic RDS settings include station identification, traffic information, program details, alternate frequencies, and other RDS options. Some settings configured here, such as program identification, program type, and program details, are also displayed on the RDS Dashboard.

  

  • Save RDS: Saves the Basic RDS settings.

  • Station ID  

    • PI (Program ID): Sets the program identification number.

    • PS Mode: Selects the Program Service name display mode:

      • Static: Displays a fixed PS name entered in the PS field.

      • Dynamic Mode 0: Scrolls the text entered in the DPS field eight characters at a time.

      • Dynamic Mode 1: Scrolls the text entered in the DPS field one character at a time.

    • PS (name): When PS Mode is set to Static, use this field to type in the Desiree PS (Program Service) name.

    • DPS (Scrolling Program Service name): When PS Mode is set to a Dynamic mode, sets the text that scrolls as the Program Service name.

    • Speed (sec): Sets the interval, in seconds, between PS text updates.

      Warning! A speed setting below 5 seconds is not recommended. The RDS standard was designed for a static Program Service name. Unlike Radio Text (RT), PS has no A/B flag to indicate that the text has changed. Rapid PS updates can prevent some receivers, particularly newer models, from displaying the name correctly.

    • RT (Radio Text): Configures Radio text.

  • Traffic

    • TP (Traffic Program): Enables the flag indicating that the station regularly broadcasts traffic reports. Compatible car radios can use this flag when operating in Traffic Search mode.

    • TA (Traffic Announcement): Enables the flag indicating that a traffic announcement is in progress. Compatible receivers can use this flag to interrupt the current audio source and switch to the station for the duration of the announcement.

    • TA Time-out: Sets a safety timeout, in seconds, that automatically clears the active TA flag if it is not reset by the announcer or automation. A value of 0 disables the timeout.

  • Program Details

    These settings describe the current program and configure the related RDS information.

    • PTY (Programme Type): Selects the program type. Available options listed in the source include 0 — No programme type defined, 1 — News, 2 — Current affairs, and 3 — Information.

    • PTYN: When Dynamic PTY is selected, sets a program type name of up to eight characters.

    • ECC: Sets the Extended Country Code.

    • Use RT: Enables transmission of Radio Text, such as song titles, artist names, or station promotions.

    • Use CT: Enables transmission of clock-time information, including the time and date.

    • Dynamic PTY: Allows the station’s program type to change dynamically, for example, from Music to News.

  • AF (Alternate Frequencies)

    • ADD: Adds an alternate frequency

    • Frequency: Sets the alternate station frequency, such as 87.5 MHz.

    • Title: Sets a descriptive title for the alternate frequency, such as the transmitter location.

  • Other RDS Options

    Outdated RDS Options: Enables legacy RDS features that the Omnia XII can still generate but that are no longer supported by the RDS standard (IEC 62106-2:2018). Newer receivers may not respond to these fields.

    The available options include:

    • Stereo

    • Artificial Head

    • Compressed

    • Music

  • These RDS features are identified as obsolete and are no longer supported by the standard:

    • MS (Groups, 0A, 0B, 15B)

    • Selected DI codes (mono/stereo, artificial head, compression)

    • Language Code

• Metadata

  

• Settings

  

  Save Settings: Saves the Basic Configuration and Remote settings

  Base Config:

  • Country: Selects the country and its associated ITU region. The preconfigured settings include region-specific values, such as the first character of the PI code (except in the USA) and the ECC code.

    Override ITU Standard: Allows manual configuration of the PI code and ECC. This is generally not recommended.

    History Length: Sets the number of RDS changes displayed on the RDS Dashboard. The minimum value is 1.

  Remote: Configures external control of basic RDS functions

  • TCP: Enables control of basic RDS functions using text commands over TCP.

  • UDP: Enables control of basic RDS functions using text commands over UDP.

  • Reset API: Enables control of basic RDS functions through the REST API.

  • Use Token: Secures REST API calls using a header token.

  • API Token: Sets the token used when Reset API is enabled.

[FM Options]

• Pre-emphasis: Selects the pre-emphasis applied to the composite output: 75μs, 50μs, or none.

• Test Tone: Set to Off for normal operation. When needed, select L Only to send a test tone to the left channel of the composite output.

[RDS Mon]

The RDS Mon block provides diagnostic information and injection-level controls for the integrated RDS generator. The Status, Overflows, and Underflows readings display corresponding codes and messages.

Status: Displays the operational status of the RDS link. The code and message indicate the current state, such as OK or an initialization or connection status.

Overflows: Indicates that incoming RDS data may be arriving faster than it can be processed or transmitted. The code and message report the detected condition. For example, repeatedly sending excessively long text strings through UECP or ASCII without sufficient pauses may cause an overflow.

Underflows: Indicates that the RDS data buffer has run empty. The code and message report the detected condition. Investigate interruptions in the data stream or problems with the automation system if this occurs.

Injection Level Controls

The injection-level controls set the level of the RDS signal mixed into the composite MPX signal. The level must be sufficient for reliable receiver decoding while remaining within the applicable modulation limits.

• Slider: Adjusts the RDS injection level using the displayed scale (0, 2, 4, 6, 8, 10).

• % field: Displays the injection level as a percentage of total composite modulation and allows you to enter a specific value. Changing either control updates the other.

[Stereo Gen]

SCA 1 Input Gain and SCA 2 Input Gain: Sets the input gain for the respective MPX SCA inputs. If the connected equipment is already calibrated to the transmitter’s expected level, set the gain to 0. Otherwise, adjust the gain to achieve the required SCA input level.

Pilot Level: Sets the 19 kHz pilot injection level, up to 12.0%, in 0.1% increments, relative to 100% modulation. Set the control to 0 to turn off the pilot.

Stereo Generator Modulation: Sets the modulation contribution of the audio and data signals to the transmitter’s RF carrier deviation. Typically, 100% modulation corresponds to ±75 kHz deviation.

SSB Mode ON/OFF: Enables or disables single-sideband suppressed-carrier (SSB) operation. SSB Mode uses a single-sideband, suppressed-carrier L−R stereo signal that can help reduce multipath effects and protect the FM multiplex baseband. Verify that its use complies with the requirements of the applicable broadcast regulatory authority before enabling it.

[Back Panel] and Audio Connector

Composite: Provides controls for MPX Composite 1 and Composite 2 output.

• Function: Sets the Composite output for MPX or 19k Pilot.

• Level: Sets the output level. Composite output levels are adjustable from 0 to 10 V.

Omnia Direct: Configures the Omnia Direct Mode for MPX AES 1 and MPX AES 2 outputs.

[μMPX Sender] and IP Connector

The μMPX Sender panel contains the sender controls. Use the scroll bar to view controls that are not displayed.

Encoder: Displays connection and streaming status and provides the following controls:

• μMPX version: Selects the μMPX version.

• Bitrate: Sets the encoding bitrate.

• Error Correction: Configures error correction.

• Packed Delay: Configures packed delay.

• Packet overhead: Configures packet overhead.

• Delay (S): Sets the delay in seconds.

• Keyframes (S): Sets the keyframe interval in seconds.

• Apply Settings: Applies the configured settings.

• Save: Saves the settings.

• Start / Stop: Starts or stops the sender.

Destinations: Provides Address and Port fields and an Add button for configuring destinations.

Levels: Displays meter activity for MPX, Pilot, and RDS levels.

Event Log: Displays event Time, Source, Level, and Message, where applicable. The panel also provides Filter and Reset controls.

[MoIP Sender] and IP Connector

The MoIP Sender distributes the composite MPX signal over IP using MoIP at 192 kHz, 16-bit resolution, to a μMPX encoder elsewhere in the system.

Enabled: Enables or disables the sender.

Name: Sets the sender name.

Payload Type: Selects the payload type.

Address: Sets an AES67 IP multicast address.

Port: Sets the port number. Enter a value or use the up/down arrows to adjust it.

Save: Saves the MoIP Sender settings.