Nautel NX15 Operation And Maintenance Manual
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Nautel NX15 Operation And Maintenance Manual

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NX15/NX25 Transmitter
Operations and Maintenance
Manual
Document:NHB-NX15-NX25-OPS
Issue:
6.0 2019-01-31
Status:
Standard

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  • Page 1 NX15/NX25 Transmitter Operations and Maintenance Manual Document:NHB-NX15-NX25-OPS Issue: 6.0 2019-01-31 Status: Standard...
  • Page 3 The comparisons and other information provided in this document have been prepared in good faith based on publicly available information. The reader is encouraged to consult the respective manufacturer's most recent published data for verification. © Copyright 2019 NAUTEL. All rights reserved.

  • Page 5: Table Of Contents

    NX15/NX25 Operations and Maintenance Manual Table of contents Contents Release control record Description Ac-Dc Power Stage Exciter Stage Control/Monitor Stage RF Power Stage RF Output Network Operating the transmitter Using the AUI Home page - describing the first page 2-19...
  • Page 6 NX15/NX25 Operations and Maintenance Manual Using the Keyed Controlled Access System (optional) 2-138 Routine maintenance Scheduled maintenance Replacing the air filter Performing on-air checks Replacing the Control/Interface PWB battery Inspecting lightning protection systems Non-standard maintenance Upgrading software Updating or Replacing Compact Flash Card...

  • Page 7: Release Control Record

    NX15/NX25 Operations and Maintenance Manual Release control record Issue Date Reason 2019-04-01 Supports hardware NARA59D and software version NX SW 4.7 or higher. Issue 6.0 2019-01-31 Page vii...
  • Page 8 NX15/NX25 Operations and Maintenance Manual Page viii Issue 6.0 2019-01-31...

  • Page 9: Description

    NX15/NX25 Electrical Schematics Some descriptions in this section refer to electrical schematics (SD-#s). These are located at the end of the NX15/NX25 Troubleshooting Manual. Redundancy The NX15/NX25 features redundancy in all key systems: • RF power modules • Exciters • Cooling fans •...
  • Page 10 SCR rectifier assembly, B+ current sensor, B+ distribution assembly, capacitor tray assembly and arc detector assembly. Ac Power Transformer The NX15/NX25’s power transformer can be set to use a range of input voltages. See Section 3, “Installing the power transformer” on page 3-1 in the NX15/NX25 Installation Manual.
  • Page 11 NX15/NX25 Operations and Maintenance Manual Description Rack Interface PWB The rack interface PWB provides various functions for the ac-dc power stage, including: • Monitors the B+ voltage and regulates the SCR rectifier’s output via the B+ level control signal applied to the rectifier’s SCR control board.
  • Page 12 NX15/NX25 Operations and Maintenance Manual Description Exciter Stage Figure 1.1 and electrical schematic SD-2 . The exciter stage consists of digital AM exciter PWBs A (A11A2) and B (A11A3), RF drive distribution PWB (A7), and PDM distribution PWB (A8). The dual digital AM exciter PWBs provide two independent exciter sections (A and B), which can be selected automatically or by local or remote control.
  • Page 13 NX15/NX25 Operations and Maintenance Manual Description The digital PDM component consists of six phased PDM signals, each separated by 60 electrical degrees. These PDM drive signals determine the transmitter output power level as well as the output modulation level. Three of these phases, each separated by 120 electrical degrees (e.g., 1, 4 and 7), are applied to a given RF power module.
  • Page 14 NX15/NX25 Operations and Maintenance Manual Description Other Functions The exciter stage interfaces with the transmitter controller to perform other functions, including: • Provides an RF Drive Latch signal to the transmitter controller to inhibit the RF drive for a set period of time during specific alarm/fault conditions.

  • Page 15: Exciter Stage

    NX15/NX25 Operations and Maintenance Manual Description Control/Monitor Stage See electrical schematic SD-3 . The control/monitor stage monitors critical signal samples and status/alarm signals from the exciter stage, RF power stage, and ac/dc power stage. It also provides customer interfaces for monitoring transmitter status and accepts customer inputs for distribution to other system components.

  • Page 16: Rf Power Stage

    See electrical schematics SD-4 , SD-5 and SD-6 . The RF power stage includes all of the transmitter’s 5 kW RF power blocks. The NX15/NX25 contains 5 RF power blocks. Each RF power block contains two RF power modules and associated relays, a fan tray, and connections to the RF drive distribution PWB, PDM distribution PWB and rack interface PWB.

  • Page 17: Rf Output Network

    NX15/NX25 Operations and Maintenance Manual Description RF Output Network See electrical schematic SD-5 and Figure 1.2 on page 1-9. The combined RF output is filtered through an RF network consisting of two “T” networks with a shunt third harmonic trap, and then provided to the antenna system.
  • Page 18 The protection circuit is set for a peak reflected power equivalent to 1.5:1 at 15 kW (NX15) or 25 kW (NX25) plus 100% peak modulation using the reflected power sample from the directional coupler (see Figure 1.2 on...
  • Page 19 NX15/NX25 Operations and Maintenance Manual Description Shutback: Shutbacks can be caused by the following alarms: SWR Shutback (exciter), Fast SWR Shutback (controller), Over-Current Shutback (exciter), Over-Voltage Shutback (exciter) and Arc Shutback (controller). • During a single shutback event (see Figure 1.3), the transmitter reduces the output...
  • Page 20 NX15/NX25 Operations and Maintenance Manual Description Cutback: A cutback occurs after multiple shutback events. When three shutback events occur within a 15 s period, the shutback accumulator exceeds its threshold. The transmitter responds by limiting the output power to 85% of the previous power set point or the power at which the shutback event occurred, whichever is lower.
  • Page 21 NX15/NX25 Operations and Maintenance Manual Description Average Reflected Power Foldback If the average reflected power, calculated over a nominal 5 s period, exceeds a limit of 4% of rated power, the output power is gradually reduced in order to maintain a reflected power that is less than this limit.
  • Page 22 NX15/NX25 Operations and Maintenance Manual Description Page 1-14 Issue 6.0 2019-01-31...
  • Page 23 NX15/NX25 Operations and Maintenance Manual Figure 1.6: NX Series Transmitter Block Diagram Issue 6.0 2019-01-31 Page 1-11...
  • Page 24 NX15/NX25 Operations and Maintenance Manual This page left bla Page 1-12 Issue 6.0 2019-01-31...

  • Page 25: Operating The Transmitter

    NX15/NX25 Operations and Maintenance Manual Operating the transmitter Section 2: Operating the transmitter This section provides information about operating the NX15/NX25 transmitter: • Using the AUI - see page 2-2 • Home page - describing the first page - see page 2-19 •...
  • Page 26 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Using the AUI The NX15/NX25 has an advanced user interface (AUI) that is displayed on a 17-inch, colour LCD screen mounted on the front of the control cabinet (see Figure 2.1). The AUI is controlled locally by a touch screen or remotely using a PC and a web browser.

  • Page 27: Preset Scheduler

    NX15/NX25 Operations and Maintenance Manual Operating the transmitter Information is displayed in a series of pages (screens) that serve specific transmitter functions. The AUI has the following configurable displays: • Instrumentation panels (See “Instrument Panels - viewing displays” on page 29.)
  • Page 28 • In the User field, enter the username. Default is “Nautel”. • In the Password field, enter the password. Default is blank. : The Nautel AUI is factory configured with a default login username and password. NOTE Nautel recommends that you change the password to improve overall system security. See “Changing the password”...
  • Page 29 SNMP Configuration PDM Settings Critical Parameters Time Setup System Settings Reset NTP Servers (see page 2-95) Upgrade Software Nautel Phone Home Exciter Clock Calibration Call Sign/ID RF Monitor Level Remote I/O Power Lockout Inputs (see page 2-123) Power Thresholds Outputs...
  • Page 31 NX15/NX25 Operations and Maintenance Manual Operating the transmitter : A maximum of ten remote connections may be logged in at a given time. If any NOTE connection is idle for more than 30 minutes, that user will be logged out, opening a spot for another user to log in.
  • Page 32 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Describing the AUI layout The AUI begins with the page (Figure 2.4) and all navigation starts from this screen. Home Figure 2.4: Home Page Forward Power Active Preset Selected Scheduler Reflected Power...
  • Page 33 NX15/NX25 Operations and Maintenance Manual Operating the transmitter • Displays information about the active preset (transmission mode, fre- Transmitter : quency, set point, forward power and reflected power). Press Menu > Presets (bottom panel) to open the page and edit this information (See “Presets - editing opera-...
  • Page 34 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Table 2.1: Available AUI Remote Functionality when Remote Control is Enabled or Disabled Remote Enabled Remote Disabled Full remote control Only the following remote AUI functionality is available when remote control is disabled.
  • Page 35 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Navigating from page to page You navigate through the AUI screens from the page or from the page Home Menu (Figure 2.5). page is the first screen to appear when you login into the AUI. You can return to Home this page from any AUI screen by pressing the logo (upper left corner) or by selecting Menu >...
  • Page 36 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Summarizing the AUI pages Table 2.2 identifies the available AUI pages. AUI Page Function See Page Home (first page) Displays an overview of transmitter features, including page 2-9 various meters and instrument panels. Choose options and navigate to other pages.
  • Page 37 NX15/NX25 Operations and Maintenance Manual Operating the transmitter AUI Page Function See Page Instrument Panels Choose the instrument panel option(s). 16 options are page 2-29 available. Up to four screens can appear on one page. (available via local or remote operation) System Review Choose meters for display.
  • Page 38 NX15/NX25 Operations and Maintenance Manual Operating the transmitter AUI Page Function See Page Scheduler Create and edit scheduler rules. page 2-65 (available via local operation or remote operation) Transmitter Status View transmitter’s active faults. page 2-70 (available via local or...
  • Page 39 NX15/NX25 Operations and Maintenance Manual Operating the transmitter AUI Page Function See Page User Settings Set network information, configure email and alarm page 2-77 notification parameters, configure Exgine interface information, configure SNMP information, capture (available via local or critical parameters, set time and date, enable/ remote operation) configure NTP servers and set call sign/ID..
  • Page 40 NX15/NX25 Operations and Maintenance Manual Operating the transmitter AUI Page Function See Page Precorrection Settings Control various critical parameter functions using the page 2-104 Precorrection page (available via local or remote operation) Changeovers Set the main exciter and auto changeover functions.
  • Page 41 NX15/NX25 Operations and Maintenance Manual Operating the transmitter AUI Page Function See Page Audio Player Manage the audio playlist files. page 2-128 (available via local or remote operation) Issue 6.0 2019-01-31 Page 2-17...
  • Page 42 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Home page - describing the first page page (Figure 2.6) is the first screen to appear after you log into the AUI. It contains Home the images that were last viewed in the AUI, from the previous login session.
  • Page 43 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Menu page - describing transmitter operations page displays icons that link to pages that control various transmitter operations Menu (Figure 2.7). Press in the “bottom panel” of an AUI screen to open this window of Menu options.
  • Page 44 NX15/NX25 Operations and Maintenance Manual Operating the transmitter • Press to control various critical functions related to precorrec- Precorrection Settings tion, (See “Precorrection Settings page” on page 104.). • Press to access a page that displays a list of users with access to the AUI...
  • Page 45 [Controller, Exciter, Rack or PM (power module)], and the time of occurrence. A maximum of five batches (10,000 items) are stored on the AUI. Older items are discarded. Refer to the NX15/NX25 Troubleshooting Manual to cross-reference the alarm name to possible causes and troubleshooting tips. Issue 6.0 2019-01-31...
  • Page 46 –two red ! indicates high severity (RF output is inhibited)]. • Time of Event indicates the time and date that the event occurred. Managing the Log You can manage the NX15/NX25 AUI’s events log by clicking on the button Log Manager...
  • Page 47 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Figure 2.9: Log Manager options (Filter Logs shown) Filter You can filter transmitter events based on their origin or date by clicking the Filter Logs button in the log manager (see Figure 2.9).
  • Page 48 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Copy You can create a copy of all the logs in the selected list (copied to the remote user’s computer clipboard) by clicking on the button in the log manager (see Figure 2.10).
  • Page 49 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Delete You can delete all events or a selection of events by clicking on the button in the log Delete manager (see Figure 2.11 on page 2-26). Click the Delete All checkbox and click to delete all events.
  • Page 50 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Statistics You can view statistical information on the events being displayed by clicking on the button in the log manager (see Figure 2.12). The screen groups similar Statistics Statistics events that occurred within the filtered period as well as the time and date of the earliest and latest event occurrence for each event type.
  • Page 51 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Legend Click on the button in the (see Figure 2.13) to display a legend that Legend Log Manager describes the meaning of the symbols shown in the State and Severity columns of the page.
  • Page 52 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Instrument Panels - viewing displays The central area of the page displays up to four panels of instrument information. You Home can choose which panels to display from 12 possible information panels (Figure 2.14).
  • Page 53 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Table 2.2: Tool Menu Panels Tool Description See Page Spectrum Displays a spectrum analyzer, capable of monitoring the page 2-31 transmitter’s RF output spectrum and the spectrum of the signal generated by the exciter.
  • Page 54 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Figure 2.15: Spectrum Analyzer Minimize Cursor Cursor Peak (Maximize) Right Left Close Figure 2.15. The carrier level is normalized to its unmodulated level Spectrum analyzer. at 0 dB. The graph center is always at the carrier frequency, as defined by the Exciter’s set Frequency value.
  • Page 55 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Use the left and right buttons to make fine adjustments. Use the up or down button to maximize (if it was minimized) or minimize (if it was maximized) the panel size. Use the “peak” button to place the cursor on the next successive peak (moving left to right) in the spectrum.
  • Page 56 NX15/NX25 Operations and Maintenance Manual Operating the transmitter The NX15/NX25’s exciter includes a fixed equalizer to optimize audio Equalizer screens. performance. There are three menus available in the tool menu panels - EQ Frequency (see Figure 2.17), EQ Impulse Response (see Figure 2.18 on page...
  • Page 57 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Use the up or down button to maximize (if it was minimized) or minimize (if it was maximized) the panel size. Figure 2.18: EQ Impulse Response EQ impulse response Figure 2.18. This panel displays the impulse response of the modulator’s EQ filter.
  • Page 58 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Figure 2.19: EQ Filter Delay Figure 2.19. This panel displays the delay of the modulator’s EQ filter EQ filter delay. across its bandwidth. Touch on the panel to display a cursor in the approximate area. The cursor position (frequency and delay) is noted in the upper, right-hand corner of the panel.
  • Page 59 NX15/NX25 Operations and Maintenance Manual Operating the transmitter The exciter linearizes the transmitter’s magnitude AM-AM and AM-PM correction screens. (envelope) path and drive signal by using two correction parameters - AM-AM Correction (see Figure 2.20) and AM-PM Correction (see Figure 2.21 on page 2-37), which can be viewed as tool menu panels.
  • Page 60 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Figure 2.21: AM-PM Correction This panel displays the phase correction being applied to the RF drive AM-PM correction. signal. The x-axis represents the signal amplitude and the y-axis represents the phase shift correction applied for a given amplitude value.
  • Page 61 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Figure 2.22: Signal Constellation Figure 2.22. In IBOC mode only, the exciter constantly measures Signal constellation. the transmitter signal and performs basic demodulation of the digital carriers. The Signal Constellation panel displays the phase and amplitude of the symbols being modulated within an OFDM sub-carrier as dots on a cartesian graph.
  • Page 62 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Figure 2.23: Lissajous Plot L and R mode I and Q mode Figure 2.23. This panel displays a Lissajous figure that represents either L Lissajous plot. (left) and R (right) audio content or a representation of the digital modulation signal [I (in- phase) and Q (quadrature)].
  • Page 63 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Figure 2.24: Smith Chart Cursor Cursor Zoom Minimize Right Left (Maximize) Zoom Close Figure 2.24. The Smith Chart allows you to visualize the impedance of the Smith chart. transmitter’s load as seen at the combiner, as a function of frequency. The impedance shown on the Smith Chart is normalized to the combiner input impedance.
  • Page 64 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Use the up or down button to maximize (if it was minimized) or minimize (if it was maximized) the panel size. Figure 2.25: Modulation Levels Figure 2.25. Bar graphs display the percentage of L+R modulation, Modulation levels.
  • Page 65 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Figure 2.26: Audio Inputs Figure 2.26. Bar graphs display the amplitude (in dB) of the audio inputs Audio inputs. selected in the preset. The level shown in yellow represents the currently measured peak amplitude, with the RMS level shown in green.
  • Page 66 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Figure 2.27: Power Distribution Graph Cursor Cursor Minimize Left Right (Maximize) Close Figure 2.27. The exciter measures the relative power levels of Power distribution graph. the signal and determines the probability of exceeding a given power level, relative to the average power.
  • Page 67 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Meters page - viewing real-time meters The AUI displays many metered parameters on the page (right side) (Figure 2.28). This Home section includes the following topics: • “Describing the meter display” •...
  • Page 68 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Accessing meter information • To delete a meter from the page, press the in the left-hand corner of the meter Home in the “Meters” window (right side). • To review all the meter options, press the information button (magnifying glass) at the...
  • Page 69 NX15/NX25 Operations and Maintenance Manual Operating the transmitter 2. To view the summary screen of each device type: Under “Transmitter Layout”, press the information button ( ) adjacent a device type (Figure 2.30 on page 2-46, Figure 2.31 on page 2-47, Figure 2.32 on page 2-47...
  • Page 70 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Figure 2.31: Meters - Information Display for the Exciter Figure 2.32: Meters - Information Display for Rack 1 Page 2-46 Issue 6.0 2019-01-31...
  • Page 71 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Figure 2.33: Meters - Information Display for Modules - Rack 1 * PM 1-10 shown Press to view Press to view previous ten modules next ten modules Power modules are numbered (e.g., PM1, PM2, etc.) in the order they are plugged in, NOTE: which is not necessarily the same as their physical location in the transmitter.
  • Page 72 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Saving meter list Meter lists are associated with user accounts. Lists saved in this screen are only displayed NOTE: in the current user account. Setting a list as default will define the meters that will appear when logging into the current account (or after an ac power interruption in the local AUI if this is the default user account).
  • Page 73 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Presets - editing operational settings page (see Figure 2.35) allows you to view operational data (power level, Presets frequency, mode, program input characteristics), plus create and control preset settings. You can create up to 61 presets or edit existing presets.
  • Page 74 NX15/NX25 Operations and Maintenance Manual Operating the transmitter When asked to enter a value in a field, an error message may appear (red text at the bottom of NOTE the screen) showing the limits of the requested value. Re-enter the desired value, ensuring it falls within For example: the limits shown.

  • Page 75: Activating Presets

    NX15/NX25 Operations and Maintenance Manual Operating the transmitter To edit a saved preset, you must load that preset from the page (see “Loading Presets” Presets on page 2-52). If the edited preset was active before it was edited, saving the preset will update the preset, but the Current Settings will not change.

  • Page 76: Understanding The Preset Tabs

    NX15/NX25 Operations and Maintenance Manual Operating the transmitter Understanding the preset tabs page consists of tabs across the top with functions on the left-side and parameters Presets displayed in the center and right-side of the window. A separate display appears for each of the...
  • Page 77 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Available settings on the Analog Settings and Digital Settings tabs are shown/hidden NOTE: based on the Overall Mode setting. Not all settings are available in all modes. Analog Settings (Figure 2.37 on page 2-57) •...
  • Page 78 AMSS - Amplitude Modulation Signalling System. Allows low-bit rate data to be transmitted with the Analog AM signal. Contact Nautel for assistance with using AMSS. Default is Disable. : The AMSS field is displayed only when the Overall Mode is Analog AM or DRM+AM.
  • Page 79 NX15/NX25 Operations and Maintenance Manual Operating the transmitter For IBOC and IBOC+AM modes: • IBOC Service Mode - In IBOC mode only, select the MA1(hybrid) or MA3 (all-digital) service mode • Enhanced Carriers - select Low, High or Disabled •...
  • Page 80 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Figure 2.37: Presets - Analog Settings Figure 2.38: Presets - Digital Settings (Overall Mode = DRM) Figure 2.39: Presets - Digital Settings (Overall Mode = DRM+AM) Page 2-56 Issue 6.0 2019-01-31...
  • Page 81 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Figure 2.40: Presets - Digital Settings (Overall Mode = IBOC) Figure 2.41: Presets - Digital Settings (Overall Mode = IBOC+AM) Figure 2.42: Presets Tabs - Audio Loss Issue 6.0 2019-01-31 Page 2-57...

  • Page 82: Preset Examples - Iboc Preset

    NX15/NX25 Operations and Maintenance Manual Operating the transmitter Preset examples - IBOC preset The following examples shows you how to set presets for the IBOC applications with typical values: 1. Enter field with desired power level. Output Power 2. Set...

  • Page 83: Preset Examples - Iboc Preset With Analog Backup

    NX15/NX25 Operations and Maintenance Manual Operating the transmitter Preset examples - IBOC preset with analog backup 1. Set two presets similar to the two previous examples. 2. Under Audio Loss , set . Several other selectable fields will Mod Loss Timeout Enabled appear.
  • Page 84 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Selecting the DCC mode The NX15/NX25 is capable of several DCC modes (see “Editing or Creating Presets” on page 2-51), each with varying performance in terms of energy savings and effects on the reproduced signal.
  • Page 85 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Figure 2.44: EAMC Figure 2.45: Basic DAM Issue 6.0 2019-01-31 Page 2-61...
  • Page 86 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Figure 2.46: Full DAM Figure 2.47: DCC1 Page 2-62 Issue 6.0 2019-01-31...
  • Page 87 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Guidelines for selecting the DCC mode: Observe the following guidelines when selecting the DCC mode for your application. AMC mode (see Figure 2.43 on page 2-61) should work well for most broadcasters and is generally recommended if you have an IBOC transmission.
  • Page 88 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Preset Scheduler If the scheduler is enabled (see “Enabling the Scheduler” on page 2-69), you can program a yearly preset schedule for the transmitter. Use the page (see Figure 2.48) to set the Scheduler dates and times at which presets take effect.
  • Page 89 NX15/NX25 Operations and Maintenance Manual Operating the transmitter The left-hand side of the page displays a monthly calendar (e.g., April 2015). Use Scheduler the << and >> buttons to navigate between months. Use the | < and >| buttons to navigate to the beginning and the end of the schedule.
  • Page 90 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Use the Rule Explorer window as follows: • In the Time of Year section, set the start (From:) and end (To:) dates for the rule. Start to end dates must be less than one year apart. Rules are automatically repeated every 365 days (366 days in a leap year) such that schedules are the same year-to- year.
  • Page 91 NX15/NX25 Operations and Maintenance Manual Operating the transmitter The following examples illustrate how to interpret the programming of a rule: Scheduler Rule Example 1 From Date: March 3 To Date: April 7 Days: SUNDAY, TUESDAY, WEDNESDAY checked, all others unchecked.
  • Page 92 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Enabling the Scheduler You can enable or disable the scheduler by clicking the button in the Date & Time Scheduler section (see Figure 2.50). Figure 2.50: Enabling/disabling the scheduler Top banner of the AUI Scheduler field (toggles Off/On) When Scheduler: ON appears in green, the transmitter will follow the Scheduler settings.
  • Page 93 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Status - viewing transmitter status You can view the operational status of the transmitter using the Page (see Figure 2.51). Status This page shows current active alarms to aid in fault diagnosis.
  • Page 94 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Viewing alarm details page displays a table that lists the active alarm details under the Transmitter Status following columns: • - identifies the alarms by their originating device (e.g., Controller, Exciter A, Device etc.)
  • Page 95 NX15/NX25 Operations and Maintenance Manual Operating the transmitter User Accounts page allows you to set up user accounts and assign different levels of access User Accounts to the transmitter control operations (see Figure 2.53). Any user may change their password, but only Administrators may add users and edit permissions.
  • Page 96 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Figure 2.54: User Accounts Page Layout Administrator Full Control View Only Auto Login Custom Users Permissions Types of users You assign a user type to identify the permissions available to that user. All users have...
  • Page 97 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Adding a user You must be an to use this function. Administrator Procedure to add a user (see Figure 2.54 on page 2-73): 1. Open the page. User Accounts 2. Press (bottom of the screen) to open a small window.
  • Page 98 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Changing permissions You must be an to edit this function. Administrator All users have permission to change their own username and password (see Figure 2.54). You can customize the permissions assigned to a user or simply pick a predetermined set of permissions based on the user type.
  • Page 99 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Setting autologin status (local only) You must be an to edit this function. This setting defines which account will be Administrator automatically entered on the local AUI. If no account is set for...
  • Page 100 NX15/NX25 Operations and Maintenance Manual Operating the transmitter User Settings page (see Figure 2.55) allows you to modify various custom user settings User Settings such as network settings and email notification settings. Figure 2.55: User Settings Page This section includes the following topics: •...
  • Page 101 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Setting up the Network page (see Figure 2.55) allows you configure parameters for connecting the Network Setup AUI to your network. Modify network settings as follows: Figure 2.56: User Settings - Setting up the Network 1.
  • Page 102 NX15/NX25 Operations and Maintenance Manual Operating the transmitter • Subnet Mask - Masks an IP address, and divides the IP address into network address and host address (normally set to 255.255.255.0) • Default Gateway - Defines the address of the network access point.
  • Page 103 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Email Configuration page (see Figure 2.57) allows you to configure email parameters (e.g., Email Configuration server name and port number). Figure 2.57: User Settings - Configuring Email Procedure to configure emails: 1. Open the page by pressing Menu >...
  • Page 104 NX15/NX25 Operations and Maintenance Manual Operating the transmitter • - Enter the information that will identify the senders and receivers of Port Number messages. Typically, this is set to 25 for SNMP systems. • - Enter an identification for the transmitter/station (e.g., Transmitter Name NX300_WXYZ).
  • Page 105 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Notifications The Notifications feature (see Figure 2.58) provides a means for the transmitter to issue emails or texts (SMS messages) triggered by user defined alarm events. If you use this feature, you must also configure an email (see “Email Configuration”...
  • Page 106 NX15/NX25 Operations and Maintenance Manual Operating the transmitter 5551234567@txt.bell.ca). Check with your mobile carrier to determine the proper gateway address for your area. 3. When complete click the OK button to accept changes or the Cancel button to discard changes and return to the Notifications page.
  • Page 107 E2X traffic in case multiple exporters are used in broadcast mode on a single LAN. 0.0.0.0 is also a valid configuration • E2X Port - The exgine expects E2X on port 9000. Some non-Nautel Exporters utilize port 11000 instead. •...
  • Page 108 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Figure 2.60: User Settings - Exgine Settings Page 2-84 Issue 6.0 2019-01-31...
  • Page 109 NX15/NX25 Operations and Maintenance Manual Operating the transmitter SNMP Configuration The SNMP configuration page provides a user with a means to configure the SNMP agent and to enable and configure associated traps (see Figure 2.61). Figure 2.61: User Settings - SNMP Configuration Configure the SNMP agent as follows: 1.
  • Page 110 NX15/NX25 Operations and Maintenance Manual Operating the transmitter 2. Click the check box to allow the SNMP agent to send trap notifications. Enable Traps and to display two additional fields associated with traps. Enter the two additional fields as follows: •...
  • Page 111 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Critical Parameters This feature is available through the remote AUI only. You can capture critical parameter data for the transmitter’s current state using the AUI’s Critical Parameters page (see Figure 2.62). To view this page, select Critical Parameters from the User Settings page.
  • Page 112 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Time Setup There is an internal clock on the transmitter that has a backup battery and maintains the accurate time and date even during power outages. The page contains editable Time Setup fields for the date (month, day and year) and time (hours, minutes, and seconds), which is shown on the main screen of the AUI and used for stamping log entries.
  • Page 113 NX15/NX25 Operations and Maintenance Manual Operating the transmitter 2. Enter the following Time and Date parameters and press Apply • - enter the hour (24-hour clock), minutes (up to 60), and seconds (up to 60). Time • - select values from the drop-down menus beside Day, Month, and Year.
  • Page 114 Operating the transmitter NTP Servers You can configure one or more NTP (Network Time Protocol) servers to allow clock synchronization with all computers on the same network as the NX15/NX25. To view the AUI’s NTP Servers page (see Figure 2.64), select NTP Servers from the User Settings options.
  • Page 115 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Enable the NTP function by selecting the Enable NTP checkbox. Disable by de-selecting the Enable NTP checkbox. Click the Apply button to activate any change. Monitoring NTP Servers The NTP Server Status section displays tabular information on the NTP servers connected to the network.
  • Page 116 This data includes logs, alarms and meter readings which are then stored in a database and can be analyzed by Nautel staff if an alarm is reported by the transmitter. Since all data is pushed out to Nautel by the transmitter to the cloud, there is no need to reconfigure your firewall and potentially compromise your transmitters security.
  • Page 117 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Setting call sign/ID The Call Sign/ID screen (see Figure 2.66) can be used to set a name that can be used to identify the transmitter on the AUI. This identification will be displayed on the top banner of the AUI page (e.g., “WABC”).
  • Page 118 NX15/NX25 Operations and Maintenance Manual Operating the transmitter System Settings page You determine critical system configuration parameters using the page (see System Settings Figure 2.67), which you access from the Menu page. This section includes the following topics: • “Reboot” on page 2-96 •...
  • Page 119 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Reboot page (see Figure 2.68) allows you to reboot two items - the AUI and the active Reboot exciter. Figure 2.68: System Settings - Reboot Procedure to reboot the AUI or Exciter: 1.
  • Page 120 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Screen configuration page (see Figure 2.69), available on the local AUI only, allows you Screen Configuration to perform a calibration on the touchscreen and to configure a screen saver for the local AUI.
  • Page 121 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Upgrade software page allows for uploading software upgrade files for various Upgrade Software transmitter components (e.g., System Controller, AUI, etc). Navigate the page as described below. For more detailed information, see "Upgrading software", on page 4-1 of this manual.
  • Page 122 The exciter clock may also be synchronized to a reference source, either an external 10 MHz reference connected to A11A1J8 or a Nautel optional GPS sync PWB, or a combiner, as applicable. The Combiner source option is applicable for combined systems only. The exciter reference will lock to the external source frequency within 10 mHz (0.01 Hz) using the...
  • Page 123 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Procedure to synchronize the exciter clock: 1. Select the option from the left side of the Exciter Clock Calibration System Settings page to open a related window on the right side of the page.
  • Page 124 You can achieve an RF monitor level of 5 V rms for power levels as low as 10% of rated NOTE: power for NX25 or 17% of rated power for NX15. Below 10% (for NX 25) or below 17% (for NX15) rated power, the maximum achievable RF monitor level may be lower than 5 V rms.
  • Page 125 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Power Lockout page (see Figure 2.74) allows you to set a high power limit for the Power Lockout transmitter. There is provision to set up to eight different limits (which can be used to accommodate daytime/night-time patterns or different antennae), but only the selected limit is active.
  • Page 126 NX15/NX25 Operations and Maintenance Manual Operating the transmitter 4. Press to activate the change(s) or press to abort. Apply Cancel Power Thresholds page (see Figure 2.74) allows you to set two distinct low forward Power Thresholds power thresholds the transmitter. These thresholds are for monitoring purposes only. The...
  • Page 127 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Precorrection Settings page You control various critical parameter functions using the page (see Precorrection Figure 2.75), which you access from the page. Menu These settings will normally be generated at the factory, based on the desired modes of NOTE: operation, and should not require user adjustment.
  • Page 128 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Mag-Phase Delay page (see Figure 2.76) allows for setting the difference in delay between Mag-Phase Delay the magnitude (PDM) path and phase (RF drive) path in the exciter. Changing this delay can help to level out and minimize spectral regrowth, providing improved spectral performance and increased margin under the mask.
  • Page 129 NX15/NX25 Operations and Maintenance Manual Operating the transmitter B+ Setpoint page (see Figure 2.77) allows you to identify the B+ Setpoint (nominally 400 B+ Setpoint V). This value does not normally require user adjustment. Figure 2.77: Precorrection - B+ setpoint Issue 6.0 2019-01-31...
  • Page 130 NX15/NX25 Operations and Maintenance Manual Operating the transmitter AM-AM Correction page (see Figure 2.78) allows you to load or capture a set of AM-AM AM-AM Correction correction curves. You can curves in this list; you can also capture a curve.
  • Page 131 NX15/NX25 Operations and Maintenance Manual Operating the transmitter AM-PM Correction page (see Figure 2.79) allows you to load or capture a set of AM-PM AM-PM Correction correction curves. You can Load or curves in this list; you can also capture a curve.
  • Page 132 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Envelope Equalization page (see Figure 2.80) allows you to load or capture a set of Envelope Equalization envelope equalization curves. You can curves in the list; you can also capture a Load Delete curve.
  • Page 133 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Configurations page (see Figure 2.81) allows users to group the parameters that appear Configurations within the Precorrection Settings menu. Figure 2.81: Precorrection - Configurations Edit button appears for local users in Local mode or for remote users in Remote mode.
  • Page 134 NX15/NX25 Operations and Maintenance Manual Operating the transmitter 2. Any existing configurations (e.g., Default Config 1610 kHz) will appear in the list. The active configuration, if applicable, is highlighted in green. You can view or edit existing configurations by pressing , if available.
  • Page 135 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Exciter Synchronization page (see Figure 2.82) displays correction curve and Exciter Synchronization configuration settings stored on each exciter and allows users to synchronize the settings between exciters A and B. When AM-AM correction, AM-PM correction and EQ curves and configurations are created, they are stored in the active exciter.
  • Page 136 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Changeover page - changing exciter transfer settings page (see Figure 2.83), accessed from the page, allows control of exciter Changeover Menu auto-changeover. Figure 2.83: Changeover Page On this page, set the following exciter information: •...
  • Page 137 WARNING: Factory settings are established at the factory and should not require any adjustment. These settings affect critical system protections. Making changes to these settings may void your warranty. Contact Nautel before making changes. For future reference, record a parameter value before and after making a change.
  • Page 138 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Audio Inputs page (see Figure 2.85) displays the measured level of the Balanced Analog Audio Inputs source (in dBm). The balanced calibration field allows for establishing a reference from a known source.
  • Page 139 NX15/NX25 Operations and Maintenance Manual Operating the transmitter B+ Calibration page (see Figure 2.86) displays the measured B+ levels, the B+ Limit B+ Calibration Setpoint (high voltage alarm level; nominally 420 V) and a calibration box. The B+ calibration value allows you to enter a measured B+ voltage to calibrate the B+ based on an externally measured B+ level.
  • Page 140 PA impedance (magnitude and phase), the test load impedance and the measured RF current. Nautel sets these values at the factory. Value changes are not typically required unless you are performing a frequency change.
  • Page 141 NX15/NX25 Operations and Maintenance Manual Operating the transmitter RF Symmetry page (see Figure 2.88) allows entering RF symmetry values for exciter A or RF Symmetry B to attempt to minimize second harmonic content when operating on each exciter. Values are factory set and should not require adjustment.
  • Page 142 NX15/NX25 Operations and Maintenance Manual Operating the transmitter SWR Thresholds page (see Figure 2.89) displays the threshold values for Peak Reflected SWR Thresholds Limit , RMS Reflected Limit , Peak RF Current Limit , Peak Reflected Scale and Fast SWR Shutback .
  • Page 143 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Transmitter Type page (see Figure 2.90) displays the selected transmitter type. The Transmitter Type selection is based on the power capacity of the transmitter and is set at the factory during testing.
  • Page 144 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Transmitter Frequency page (see Figure 2.91) displays the precise carrier frequency of the Transmitter Frequency transmitter. Do not change the carrier frequency unless you are performing a frequency change procedure. WARNING: Factory settings are established at the factory and should not require any adjustment.
  • Page 145 NX15/NX25 Operations and Maintenance Manual Operating the transmitter PDM Settings page (see Figure 2.92) displays the selected PDM settings. The selection is PDM Settings based on the PDM configuration of the transmitter and is set at the factory during product testing.
  • Page 146 Click X in the upper, right corner to close this page and return to the home page. Refer also to the NX15/NX25 Pre-installation Manual for information on remote inputs and outputs and their factory default settings.
  • Page 147 . That setting can only be selected by a Remote local user using the front panel AUI. Nautel sets remote input defaults prior to shipping. See the NX15/NX25 Pre-installation Manual for details. If necessary, re-configure the remote inputs as follows: Figure 2.94: Remote I/O Input Parameters...
  • Page 148 NX15/NX25 Operations and Maintenance Manual Operating the transmitter • Inc/Dec RF Power - tells the system to increase (if possible) or decrease output carrier power. • Main Exciter - selects the main exciter to operate the transmitter. • Auto Changeover - enables (on)/disables (off) the automatic exciter changeover func- tion.
  • Page 149 Nautel sets remote output defaults prior to shipping. See the NX15/NX25 Pre-installation Manual for details. If necessary, re-configure the remote outputs as follows: Figure 2.95: Remote I/O - Output Parameters...
  • Page 150 • - Active logic level indicates that the selected alarm is occurring. Any Various Alarms transmitter alarm can be selected as a digital output. Refer to the NX15/NX25 Trou- bleshooting Manual for a description of each alarm. • - Active logic level indicates that a watchdog reset is occurring, due to AUI Watchdog an error in communication between the Controller and the single-board computer.
  • Page 151 Menu Using the audio player in the NX15/NX25 requires the installation of the optional USB sound card. This converts the streamed audio to a USB port on the single-board computer (SBC) to an AES stream that can be connected to an AES input on the control card.
  • Page 152 NX15/NX25 Operations and Maintenance Manual Operating the transmitter The playlist (or Icecast/Livewire stream) is typically used as an audio loss backup. For example, the user may operate with Preset 1 using one of the standard audio sources. Preset 1 can be configured to switch to another preset (e.g., Preset 2), which uses a playlist or stream, if Preset 1 loses its audio.
  • Page 153 NX15/NX25 Operations and Maintenance Manual Operating the transmitter button, available on the remote AUI only, displays a pop-up window that Manage Files allows the user to Browse for files and Upload them to the USB or Delete them from the USB.
  • Page 154 Operating the transmitter Streams The NX15/NX25 is capable of playing audio streams in either Icecast or Shoutcast format. The audio player supports Icecast/Shoutcast playlists and IP addresses for audio streams. For an Icecast/Shoutcast playlist enter the URL for the station. For an audio stream, enter the URL for that stream.

  • Page 155: Using The Ac Disconnect Switch

    Figure 2.99 on page 2-133) is provided with the NX15/NX25 transmitter to ensure operator safety. The transmitter’s rear door must be closed and locked before ac power to the transmitter can be turned on. Similarly, ac power must be turned off before the rear door can be opened.
  • Page 156 NX15/NX25 Operations and Maintenance Manual Operating the transmitter 2. Insert the SERVICE KEY into the ac disconnect switch box’s key hole and turn the key counter clockwise to the ON position. Move the ac switch to the ON position to apply ac power to the transmitter.
  • Page 157 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Using the Keyed Controlled Access System (optional) The NX15/NX25 high power transmitter can be equipped with a optional key controlled interlock system (Figure 2.100 on page 2-137) to ensure operator safety. The transmitter’s rear doors must be closed and locked before ac power to the transmitter can be turned on.
  • Page 158 NX15/NX25 Operations and Maintenance Manual Operating the transmitter 4. Access Lock Keys (quantity 2): required to open access panels throughout the transmitter system. Access panels must be closed and locked to release access lock keys. Opening access panels Procedure to gain access to the inside of the transmitter: 1.
  • Page 159 NX15/NX25 Operations and Maintenance Manual Operating the transmitter 4. Turn the SERVICE ENTRANCE KEY (‘A’ key) counterclockwise and remove it from ANTENNA GROUND SWITCH (see “Guidelines (2): Antenna ground switch” on page 2- 136) lock. 5. Insert the SERVICE ENTRANCE KEY (‘A’ key) into the ac power entrance (see “Guidelines (1): Ac power entrance panel”...
  • Page 160 NX15/NX25 Operations and Maintenance Manual Operating the transmitter Figure 2.100: Keyed Controlled Access Sequence Diagram ACCESS LOCK KEY (rear door) (quantity 1) “C” IN ANTENNA GROUND SWITCH “A” IN “B” OUT Ac DISCONNECT SWITCH ACCESS LOCK TRANSFER KEY (filter panel)
  • Page 161 3-4). Remove the air filter by sliding it up and out of the retaining brackets, rinse it with water, spray both sides of the air filter with Handi-Koter filter coat (Nautel Part # HQ59, located in the ancillary kit), then re-install the air filter. If the air filter becomes damaged, replace it as soon as possible.
  • Page 162 Never use compressed air to clean the NX15/NX25. Checking hardware All hardware must be checked at least once a year. Thermal cycling from turning the NX15/ NX25 on and off will require more frequent checks. • To prevent damaging the hardware, ensure that the proper sized tools are used. In most cases, hardware is metric.
  • Page 163 Take the following steps to replace an NX15/NX25 air filter: 1. Order a new filter, as necessary. You can order a standard sized filter from Nautel (Nautel Part # HR111) or from the manufacturer (Research Products, EZ Kleen filter # 9151) or obtain one from any local supplier of HVAC supplies.
  • Page 164 NX15/NX25 Operations and Maintenance Manual Routine maintenance Figure 3.1: Replacing the Air Filter Partial Rear View NOTE: Air flow direction is back to front Page 3-4 Issue 6.0 2019-01-31...
  • Page 165 NX15/NX25 Operations and Maintenance Manual Routine maintenance Performing on-air checks You should check the on-air quality of the transmitter’s signal periodically. This check can be done locally at the transmitter site, or remotely from another location in the transmitter’s coverage area.
  • Page 166 Interval Every 12 months. Parts and tools Replacement battery. 3 V lithium coin cell, 20 mm (Nautel recommends Panasonic Part # CR2032). Procedure Perform the following steps to replace the battery: 1.
  • Page 167 NX15/NX25 Operations and Maintenance Manual Routine maintenance Inspecting lightning protection systems You should inspect the lightning protection systems that are connected to your NX15/NX25 transmitter, ac power, RF feedline, antenna and tower periodically to ensure that your site, equipment and personnel are fully protected.
  • Page 168 NX15/NX25 Operations and Maintenance Manual Routine maintenance Page 3-8 Issue 6.0 2019-01-31...
  • Page 169 NX15/NX25 Operations and Maintenance Manual Non-standard maintenance Section 4: Non-standard maintenance This section provides instructions for performing non-standard maintenance on the NX15/ NX25 transmitter. This section includes the following topics: • Upgrading software • Updating or Replacing Compact Flash Card - see page 4-4...
  • Page 170 NX15/NX25 Operations and Maintenance Manual Non-standard maintenance Transferring Upgrade File The following steps assume either the laptop will be used to connect directly to the transmitter OR the transmitter and network computer are currently connected to the same network. Transmitter IP Configuration 1.
  • Page 171 3. At the transmitter login screen enter: – User: “Nautel” or “****”, where **** is the user assigned user name – Password: leave blank (default) or “****”, where **** is the user assigned password 4. Navigate through the AUI to Menu -> System Settings -> Upgrade Software , select the Manage Files button and press Browse .
  • Page 172 *.tgz file. A replacement compact flash card with pre-loaded software can be purchased from Nautel (part # 207-8707) or you can burn the IMAGE file on the existing compact flash card. Using a web browser go to ftp://www3.nautel.com/NX_Series/...
  • Page 173 NX15/NX25 Operations and Maintenance Manual Non-standard maintenance Touchscreen Calibration A touchscreen calibration is required if a new image file has been burned onto the compact flash card, the card has been replaced, the touchscreen has been replaced, or the pointer is not aligning with touch inputs.
  • Page 174 4. Enter and confirm your new password. 5. Record your new password on the Proof of Performance document provided with the transmitter. If you would like Nautel to track your password for support purposes, please email support@nautel.com with your new information.
  • Page 175 NX15/NX25 Operations and Maintenance Manual List of terms Section 5: List of terms This section defines some of the terms that are used in Nautel documentation. Analog to Digital Converter. ADC. Audio Engineering Society/European Broadcasting Union (AES/EBU) is the name AES-EBU.
  • Page 176 Preset. time-of-day and date basis. Exciters can be configured on a preset for a specific operating mode (for example, Exciter A - conventional AM, and Exciter B - IBOC). The NX15/NX25 allows you to pre-program multiple presets. A complete loss of RF output power, caused by any one of a variety of faults, Shutback.
  • Page 178 Phone: +1.902.823.3900 or Fax: +1.902.823.3183 Nautel Inc. 201 Target Industrial Circle Bangor, Maine USA 04401 Phone: +1.207.947.8200 Fax: +1.207.947.3693 Customer Service (24-hour support) +1.877.628.8353 (Canada & USA only) +1.902.823.5100 (International) Email: support@nautel.com Web: www.nautel.com © Copyright 2019 NAUTEL. All rights reserved.

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