Nautel NV15 Operation And Maintenance Manual
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Nautel NV15 Operation And Maintenance Manual

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NV15/NV20 Transmitter
Operations and Maintenance
Manual
Document: NHB-NV15-NV20-OPS-3.2
Issue:
3.2 2013-10-01
Status:
Standard

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  • Page 1 NV15/NV20 Transmitter Operations and Maintenance Manual Document: NHB-NV15-NV20-OPS-3.2 Issue: 3.2 2013-10-01 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 2012 NAUTEL. All rights reserved.

  • Page 5: Table Of Contents

    NV15/NV20 Operations and Maintenance Manual Table of contents Contents Release control record About this manual About Safety xiii Electrical Hazards xiii Lightning Hazards RF Hazards Toxic Hazards Other Hazards Safety Precautions Personal Safety Site Safety Equipment Safety xviii Description Ac-dc power stage...
  • Page 6 NV15/NV20 Operations and Maintenance Manual Table of contents Viewing real-time meters 2-40 Presets - editing operational settings 2-44 Viewing transmitter status 2-59 Factory Settings 2-61 System Settings 2-70 User accounts 2-79 Changeover page 2-83 User settings 2-84 Remote I/O page...

  • Page 7: Release Control Record

    Release 3 of product (NARF50B) 2012-12-15 Section 2: updated to support software release 4.0 Section 3: expanded air filter descriptions to include M7, MERV 7 filters as suitable replacements 2013-10-01 Added Nautel Phone Home to User Settings Issue 3.2 2013-10-01 Page vii...
  • Page 8 NV15/NV20 Operations and Maintenance Manual Page viii Issue 3.2 2013-10-01...

  • Page 9: About This Manual

    NV15/NV20 Operations and Maintenance Manual About this manual This manual provides technical information needed when operating, maintaining and troubleshooting an NV15/NV20 transmitter. This manual is intended for use by transmitter operators and field technicians. Using this manual If you are responsible for configuring or operating a transmitter, see Section 2, “Operating the...
  • Page 10 Tip: When you have completed a task or a step, put a checkmark beside the step number. Technical support Nautel offers technical support to customers over the Internet and by telephone. Nautel’s customer support team will answer your questions and work with you to identify and resolve problems.
  • Page 11 The Nautel website provides useful resources to keep you up to date on your NV15/NV20. Nautel User Group (NUG) The website includes a special section that customers can log into in order to access the Nautel customer newsletter, product manuals, frequently asked questions (FAQ), information sheets, and information about field upgrades.
  • Page 12 NV15/NV20 Operations and Maintenance Manual Page xii Issue 3.2 2013-10-01...

  • Page 13: About Safety

    NV15/NV20 Operations and Maintenance Manual About Safety All Nautel transmitters are designed to meet the requirements of EN60215, Safety Requirements for Radio Transmitters. The philosophy of EN60215 is that the removal of any cover or panel that can only be opened using a tool is a maintenance activity, and that any person performing a maintenance activity is expected to be trained for that activity.

  • Page 14: Lightning Hazards

    NV15/NV20 Operations and Maintenance Manual Use a proper lockout procedure to ensure that another worker cannot accidentally reapply power while you are performing maintenance on any part of the transmitter or site. Lightning Hazards Before opening the transmitter and touching internal parts, remove and solidly ground the antenna connection.

  • Page 15: Safety Precautions

    Personnel must be familiar with the transmitter, so that they can avoid physical danger, and be aware of hazards to themselves and the equipment. Nautel offers a number of training courses covering the basic fundamentals of RF systems and transmitters, and the operation and maintenance of the transmitter. For more information about available courses and schedules, go to the Nautel website at http://www.nautel.com/Training.aspx,...
  • Page 16 Operation of safety interlocks (if installed) First Aid Nautel does not offer first aid training, since the hazards associated with high voltage and RF energy are not specific to the transmitter. However, the customer should provide first aid training to all personnel who have access to the transmitter site.
  • Page 17 NV15/NV20 Operations and Maintenance Manual Marking Hazards Place warning signs close to any hazardous areas or systems (e.g., the feedline or the antenna system). Make the signs large enough that they cannot be missed. Provide signage in all languages used in the region.

  • Page 18: Equipment Safety

    (and to protect the rest of your site equipment and your personnel). For detailed information about lightning protection, see the Nautel Site Preparation Manual, available from your Nautel sales agent, or online from the Nautel website.
  • Page 19 NV15/NV20 Operations and Maintenance Manual Earthquake Protection If the transmitter site is in a region that experiences any noticeable earthquake activity, take steps to prevent the transmitter from shifting or rocking during an earthquake. Even during minor earthquakes, rocking or movement of the transmitter is likely to damage the feedline connection, and could even cause a catastrophic failure of the ac power feed into the transmitter.
  • Page 20 NV15/NV20 Operations and Maintenance Manual Page xx Version 3.2 2013-10-01...

  • Page 21: Description

    NV15/NV20 electrical schematics Some descriptions in this section refer to electrical schematics (SD-#s) . These are located in Section 5 of the NV15/NV20 Troubleshooting Manual. Redundancy The NV15/NV20 features redundancy in all key systems: • RF power modules • Exciters •...
  • Page 22 NV15/NV20 Operations and Maintenance Manual Description Ac-dc power stage See electrical schematics SD-1 ( A , B or C ), SD-2 and SD-3 . The ac-dc power stage converts the ac power source to a positive dc voltage (PA volts) for the transmitter's intermediate (IPA) and RF power amplifiers.
  • Page 23 NV15/NV20 Operations and Maintenance Manual Description LVPS modules See Figure SD-1 ( A , B or C ). LVPS modules A (U3) and B (U4) convert the ac input voltage to the regulated low voltage dc supplies. The +5 V, +15 V and -15 V regulated outputs of the supplies are ORed together at the control/interface PWB (A1) and applied throughout the transmitter.
  • Page 24 Exciters A (A3) and B (A4) are the RF drive sources for the transmitter. They accept the external audio program and/or IBOC information (see the NV15/NV20 Installation Manual for details on various program input types). The exciters’ main/standby operation is controlled locally using the AUI, or remotely.
  • Page 25 NV15/NV20 Operations and Maintenance Manual Description Exciter relay control The RF drive outputs from exciters A and B are applied to the splitter/changeover PWB (A5A1) at A5A1J1 and A5A1J2 respectively. The Exciter Relay Control input (A5A1J3-4) is a signal applied from the control/monitor stage that controls relay A5A1K1.
  • Page 26 PWB (A17), a combiner/filter (A16), an output power probe (A13), a 2-input reject load assembly (A14) and a reject load interface PWB (A15). RF power module See Figure SD-7 (see the NV15/NV20 Troubleshooting Manual for a detailed RF power module description) and “RF Power Module Block Diagram” on page 1-11.
  • Page 27 NV15/NV20 Operations and Maintenance Manual Description The 10 kW combiner/filter (A16) accepts the RF outputs from two RF power modules and provides a single RF output. The 10 kW combiner/filter uses a 3 dB hybrid coupler, which accepts the outputs of two RF power modules.
  • Page 28 NV15/NV20 Operations and Maintenance Manual Description Page 1-8 Issue 3.2 2013-10-01...
  • Page 29 NV15/NV20 Operations and Maintenance Manual Figure 1.2: NV Series Transmitter Block Diagram 10KW POWER BLOCK PWR SUPPLY MODULE A PWR SUPPLY IPA PWR SUPPLY PWR SUPPLY LV PWR LV PWR SUPPLY A SUPPLY LV PWR SPLITTER COMBINER 3 PHASE AC POWER...
  • Page 30 NV15/NV20 Operations and Maintenance Manual Figure 1.3: NVE300 Exciter Block Diagram EXCITER PWB EXTERNAL 10MHz REFERENCE TOSLINK OPTICAL ASRC 2 x AES/EBU POWER AMPLIFIER SCA GENERATOR VSWR PROTECTION TCXO OR COMPOSITE SCA PLL & VCSO OCXO TEMP SENSE BIAS BIAS...
  • Page 31 NV15/NV20 Operations and Maintenance Manual Figure 1.4: RF Power Module Block Diagram 4-WAY 4-WAY OUTPUT SPLITTER COMBINER 4-WAY 4-WAY RF DRIVE SPLITTER COMBINER IPA PWR SUPPLY PWR SUPPLY 1 PWR SUPPLY 2 B2060005 VB Issue 3.2 2013-10-01 Page 1-11...

  • Page 33: Operating The Transmitter

    NV15/NV20 Operations and Maintenance Manual Operating the transmitter Section 2: Operating the transmitter This section provides information about operating the NV15/NV20 transmitter: • Using the AUI - see page 2-2 • Home page - see page 2-14 • Menu page - describing transmitter operations - see page 2-15 •...
  • Page 34 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Using the AUI The NV40/30 has an advanced user interface (AUI) that is displayed on a 17-inch, colour LCD screen mounted on the front of the control cabinet (Figure 2.1). The AUI is controlled via touch screen that you can also access using a PC and a web browser.
  • Page 35 NV15/NV20 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: • Login Page (see Logging into the AUI on page 2-3) •...
  • Page 36 • In the Password field, enter the password. Default is blank. Note: The Nautel AUI is factory configured with a default login username and password. Nautel recommends that you change the password to improve overall system security. See Changing the password on page 2-81.
  • Page 37 In the Language field, press the down-arrow to review a drop-down menu displaying the available language options, and select one. • In the User field, enter the username. Default is “Nautel”. • In the Password field, enter the password. Default is blank.
  • Page 38 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Page 2-6 Issue 3.2 2013-10-01...
  • Page 39 2-62 Notifications page 2-90 Settings page 2-61 Exgine Settings page 2-91 Transmitter Type page 2-63 Scaling page 2-64 Nautel Phone Home page 2-93 Thresholds page 2-65 SNMP Configuration page 2-94 System Redundant Supplies page 2-66 Critical Parameters page 2-96...
  • Page 41 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Figure 2.3: Remote AUI Login Menu IP address and login messages AUI software version Describing the AUI layout The AUI begins with the Home page and all further navigation will start from this screen (see Figure 2.4 on page...

  • Page 42: Factory Settings

    NV15/NV20 Operations and Maintenance Manual Operating the transmitter List of AUI pages Table 2.1 defines the available AUI pages. Table 2.1: AUI Pages AUI Page Function See Page Home View meters, tool menu panels, choose options and page 2-14 navigate to other pages.
  • Page 43 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Figure 2.4: Using the AUI Set Point, Active/Select Reflected Active Date & Forward Preset Mode, Power Time Exciter Power Frequency Modulation Banner Level Selected Tool Menu Meters Panel Displays (up to 4 on...
  • Page 44 NV15/NV20 Operations and Maintenance Manual Operating the transmitter • Forward Power : Displays the analog power output when in FM or FM +HD modes and dis- plays the HD power output when in HD (only) mode. The bottom banner is also permanent on all AUI pages and includes the following buttons, some of which open other menus and displays: •...
  • Page 45 NV15/NV20 Operations and Maintenance Manual Operating the transmitter The displays between the top and bottom menus, contains user selected pages. These pages provide access to a variety of AUI functions such as transmitter status and hardware settings. The following paragraphs describe how to use these pages.
  • Page 46 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Home page The Home page is the first screen to appear when you login into the AUI. You can return to the page, from any screen, by pressing on the logo (upper left corner) or by pressing Menu >...
  • Page 47 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Menu page - describing transmitter operations From the page, press the Menu button to view the Menu page (see Figure 2.7). The Menu Home page displays icons that link to pages that control various transmitter operations.
  • Page 48 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Press User Accounts to access a page that displays a list of users with access to the AUI and, depending on permission level, allows editing of user accounts (see User accounts on page 2-79).
  • Page 49 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Figure 2.8: Log page Page number of displayed page first page page-by-page row-by-row row-by-row page-by-page last page Navigate through the table using these arrows Viewing event logs page displays a “read only” chronological table of log events under the following column...
  • Page 50 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Figure 2.9: Alarm Severity = low (RF output not affected) = medium (RF output may be reduced) = high (RF output may be inhibited) • Time of Event - identifies the day-of-the-week, date and time of the alarm event.
  • Page 51 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Understanding the log manager window The Log Manager window contains the functions that edit the logs listed in the page. Press the Logs Log Manager button to open a configurable window with the following display options identified by...
  • Page 52 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Filtering logs You can filter transmitter events based on their device or date by clicking the Filter Logs button in the Log Manager (see Figure 2.10). Select a Device by pressing the Select a Device button to reveal the following event monitoring op- tions in a drop-down menu: –...
  • Page 53 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Copying logs You can create a copy of all the logs in the selected list while remotely logged into AUI (these are copied to the remote user’s computer clipboard) by clicking on the Copy Logs button in the log...
  • Page 54 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Figure 2.12: Log Manager - Deleting Logs Month Year Hours Minutes Viewing log statistics Users can view statistical information on the events being displayed by clicking on the Statistics button in the Log Manager (see Figure 2.13 on page...
  • Page 55 NV15/NV20 Operations and Maintenance Manual Operating the transmitter – Earliest - refers to the first time of an alarm occurrence. – Latest - refers to the last time of an alarm occurrence. If an alarm has only one occurrence (i.e., # Events column is 1), then the time in the “...
  • Page 56 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Viewing the legend The Legend tab is different from the other tabs. Press the Legend tab to display a window describing the meaning of the symbols that appear in the State and Severity columns of the...
  • Page 57 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Viewing tool menu panels The center area of the page screen displays up to 4 panels of instrument information. Users Home can choose which panels to display from 9 possible information panels (see Figure 2.15).
  • Page 58 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Describing instrument panel options The following table describes instrument panel options: Table 2.2: Tool Menu Panels Tool Description Reference Spectrum Displays a spectrum analyzer, capable of monitoring page 2-30 the transmitter’s RF output spectrum and various RF sections of the exciter.
  • Page 59 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Viewing instrument panels Each instrument panel has a menu bar that may be different from other panels (see Figure 2.16). Figure 2.16: Instrument Panel Menus Backward one step Forward one step Maximize / Minimize...
  • Page 60 NV15/NV20 Operations and Maintenance Manual Operating the transmitter • To enlarge/reduce the instrument panel, use the maximize/minimize buttons. Some instru- ment displays show more information when maximized. – Most panels can be maximized to fill the whole screen, e.g., EQ Impulse Response (see Figure 2.18 on page...
  • Page 61 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Figure 2.18: Instrument Panel - Expansion Example 1 Maximize/Minimize buttons Figure 2.19: Instrument Panel - Expansion Example 2 Maximize/Minimize buttons Issue 3.2 2013-10-01 Page 2-29...
  • Page 62 If these spurious emissions are observed on the spectrum analyzer, Nautel recommends that a calibrated, external spectrum analyzer be used to verify the presence of spurs.
  • Page 63 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Use the left and right buttons to make fine adjustments. Use the maximize or minimize buttons as required. Use the “peak” button to place the cursor on the next successive peak (moving left to right) in the spectrum.
  • Page 64 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Equalizer screens The NV15/NV20’s exciter includes a fixed equalizer to optimize audio performance. There are three EQ instrument panels available in the Tool Menu - EQ Frequency (see Figure 2.22), EQ Impulse Response (see Figure 2.23 on page...
  • Page 65 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Figure 2.23: EQ Impulse Response EQ impulse response Figure 2.23. This panel displays the impulse response of the modulator’s EQ filter in the time domain. This is a static display tool so the screen image is not fluid and will not change.
  • Page 66 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Figure 2.24: EQ Filter Delay EQ filter delay Figure 2.24. This panel displays the delay of the modulator’s EQ filter across its bandwidth. Touch on the panel to display a cursor in the approximate area. The cursor position (delay and frequency) is noted in the upper, right-hand corner of the panel.
  • Page 67 NV15/NV20 Operations and Maintenance Manual Operating the transmitter AM-AM and AM-PM correction screens When the transmitter is operating with digital carriers, the exciter linearizes the transmitter’s RF drive signal by performing adaptive pre-correction. There are two correction parameters - AM-AM...
  • Page 68 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Figure 2.26: AM-PM Correction AM-PM correction This panel displays the phase correction being applied to the RF drive signal in order to compensate for the transmitter’s (IPA +PA stage) phase non-linearity versus the output power. For example, in Figure 2.26...
  • Page 69 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Figure 2.27: Signal Constellation Signal constellation Figure 2.27. The exciter constantly measures 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 70 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Figure 2.28: Lissajous Plot L and R mode I and Q mode Lissajous plot Figure 2.28. This panel displays a Lissajous figure that represents either L (left) and R (right) audio content or a representation of the FM modulated signal [I (in-phase) and Q (quadrature)]. I and Q will be automatically selected unless the transmitter is operating in stereo mode or not operating in IBOC.
  • Page 71 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Figure 2.29: Power Distribution Plot Power distribution plot Figure 2.29. The exciter measures the relative power levels of the signal and determines the probability of exceeding a given power level, relative to the average power. The data is plotted in the Power Distribution Plot as a CCDF (complementary cumulative distribution function).
  • Page 72 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Viewing real-time meters The AUI can be used to display metered parameters on the page (see Figure 2.30), if selected Home individually from the page or saved in a meter list layout and set to default.
  • Page 73 NV15/NV20 Operations and Maintenance Manual Operating the transmitter • A parameter value in the yellow section (as applicable) of a meter bar indicates the parameter is still within an operational range, but is approaching design limitations. • A parameter value in the red section of a meter bar indicates the parameter is outside normal operating conditions.
  • Page 74 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Identifying meter information on a specific sub-device Open the Meters List View window and select one of the desired transmitter sub-devices. – Controller – Exciter A – Exciter B – RF Modules - Multiple modules supported Under Transmitter Layout , press the information button (i) beside a device type.
  • Page 75 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Saving a meter list Note: Meter lists are associated with user accounts. Lists saved in this screen are only displayed 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 76: Presets - Editing Operational Settings

    NV15/NV20 Operations and Maintenance Manual Operating the transmitter Presets - editing operational settings The Presets page (see Figure 2.34) allows users with the appropriate permissions to view operational data (power level, frequency, mode, program input characteristics), plus create and control preset settings.
  • Page 77 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Editing or creating presets When a presets page is opened from the menu, (for example see Figure 2.34 on page 2-44 Figure 2.37 on page 2-52), the Current Settings of the transmitter are displayed. They define the current operational state of the transmitter.
  • Page 78 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Loading presets When first entering the Presets page, the current “active” preset is displayed (see Figure 2.34 on page 2-44). If the current preset is not the desired one, use the Load button on the left-side of the AUI to call up a window containing a list of available presets.
  • Page 79 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Understanding the preset tabs The Presets page consists of tabs across the top with functions on the left-side and parameters displayed in the center and right-side of the window. A separate display appears for each of the...
  • Page 80 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Mode - additional calibration settings: IBOC Injection (Lower): for FM+HD and HD modes, enter value, in dB, – between -20 and -10 dB for the IBOC injection level of the lower sideband of digital carriers.
  • Page 81 HD Power Boost: for FM+HD mode only. Enable this setting to engage – Nautel’s digital PowerBoost process, an advanced peak-to-average power ratio reduction that increases hybrid-mode transmitter efficiency and power capability. HD PowerBoost is only available in transmitters with the appropriate exciter configuration.
  • Page 82 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Figure 2.36: Presets - Main Audio Main Audio - (see Figure 2.36) : • Connects the appropriate exciter input for use. Available options are: Audio Source Left/Right/Mono: this source allows for further configuration via –...
  • Page 83 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Main audio - additional configuration settings: Analog Level: applies to Left/Right/Mono source only; enter value – between -12 and +12 dBu, which represents the input voltage level that yields 100% modulation (typically 4.7 dBu).
  • Page 84 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Figure 2.37: Presets - SCA SCA - (see Figure 2.37) : • Connector SCA2) for use with an externally gen- (J7:A for SCA1, J7:B for MPX SCA erated SCA; select Enabled or Disabled. When enabled, all the selections listed below are active.
  • Page 85 NV15/NV20 Operations and Maintenance Manual Operating the transmitter SCA1 or SCA2 Lowpass Filter: select Enabled (applies 7.5 kHz low-pass – filter to audio input) or Disabled. SCA1 or SCA2 Preemphasis: select 0 us, 50 us, 75 us or 150 us.
  • Page 86 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Data Source: select Ext. UECP, Internal RBDS, Internal RDS or Ext. – ASCII, ASCII Over IP, UECP Over IP. Injection Level: enter value between 0 and 10% (typically 5%). This level –...
  • Page 87 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Traffic Info: select None , TA (Traffic Announcement) , TP (Traffic – Programme) or TA+TP . The receiver can often be set to pay special attention to this flag and, for example, stop the tape/pause the CD or retune to receive a traffic bulletin.
  • Page 88 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Figure 2.39: Presets - Other Settings Other Settings - (see Figure 2.39) : • Other Settings Provides the following sub-functionality: Pilot Level: enter value between 6 and 12 % (typically 9 %) . This level is –...
  • Page 89 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Auto Changeover Action: users can select which preset they want the – transmitter to switch to in the event of an automatic exciter changeover. This function is ideal for changing to a preset that has a different HD PA Volts value, which is required when a different exciter is active - e.g.
  • Page 90 NV15/NV20 Operations and Maintenance Manual Operating the transmitter AGC Limiter: select Enabled , then enter AGC Limit percentage (allowable – range is 0-160%, defaulted to 120%) and Time Constant (allowable range is 0-1000 ms, defaulted to 0 ms). If Enabled , when the modulation level exceeds the AGC Limit, the gain of the audio input will instantly decrease in order to reduce the modulation level below the AGC limit threshold.

  • Page 91: Viewing Transmitter Status

    NV15/NV20 Operations and Maintenance Manual Operating the transmitter Viewing transmitter status You can view the NV15/NV20’s operational status using the Transmitter Status page - see Figure 2.40. This page shows current active alarms and status to aid in fault diagnosis. To view the Transmitter Status page, select Status from the AUI bottom banner.
  • Page 92 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Viewing alarm details Transmitter Status page - see Figure 2.40 page 2-59 displays a table that lists the active alarm details under the following columns: • Device - identifies the alarms by their originating device (e.g., Controller, Exciter A, etc.) •...
  • Page 93 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Factory Settings Values for critical parameters are set using the Factory Settings page (see Figure 2.42), which is accessed from the Menu page. To use this page, simply select an item from the list on the left-side of the page to open related information on the right-side of the page.
  • Page 94 NV15/NV20 Operations and Maintenance Manual Operating the transmitter System configuration This factory setting (see Figure 2.43) configures the type of system the transmitter will be part of, sets the ALC Limit (in %), and sets the cooling Fan Voltage .
  • Page 95 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Transmitter type This factory setting parameter (see Figure 2.44) allows for setting the transmitter type (NV5, NV10, NV20 etc.). This setting is one-time, factory configured and cannot be changed. Figure 2.44: Factory Settings - Transmitter Type WARNING: Device settings are established at the factory and should not require any adjustment.
  • Page 96 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Scaling This factory setting (see Figure 2.45) supports the calibration of various metered parameters. Figure 2.45: Factory Settings - Scaling WARNING: Device settings are established at the factory and should not require any adjustment. These settings affect critical system protection circuits.
  • Page 97 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Thresholds This factory setting (see Figure 2.46 Figure 2.47) supports the setting of alarm thresholds for critical parameters. Select the desired threshold from the list located in either the Transmitter or RF Module tabs and touch the applicable field to enable editing.
  • Page 98 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Redundant supplies This factory setting (see Figure 2.48 ) supports configuring redundant fan, IPA, LVPS and 12 V power supplies. Select Yes (default) if the supply operates as a redundant set. Select No if the supply is standalone.
  • Page 99 NV15/NV20 Operations and Maintenance Manual Operating the transmitter IPA bias balance IPA Bias Balance (see Figure 2.49 on page 2-68) allows for optimal balancing of RF power module outputs to minimize reject load power. An IPA Balancing Recommended Alarm will be generated when balancing is suggested.
  • Page 100 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Figure 2.49: Factory Settings - IPA Bias Balance IPA Bias DAC 1 = Module 1 IPA Bias DAC 2 = Module 2 Note: The IPA Bias Balance function targets the lowest possible total transmitter reject power. However, there is no guarantee that it will achieve less than a specific amount.
  • Page 101 NV15/NV20 Operations and Maintenance Manual Operating the transmitter PA field bias This factory setting (see Figure 2.50) allows the user to easily set the applicable bias values from the control tag provided with the replacement PA. Select which RF Module and PA position the replacement PA was installed in, then enter the Bias Values for indices 1 through 5 from the factory supplied control tag.
  • Page 102 NV15/NV20 Operations and Maintenance Manual Operating the transmitter System Settings Users determine critical system configuration parameters via the System Settings page (see Figure 2.51), which you access from the Menu page. This section includes the following topics: • Reset on page 2-71 •...
  • Page 103 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Reset The Reset page (see Figure 2.52) allows users to reboot three items - the AUI, the active exciter and the standby exciter (if installed). Figure 2.52: System Settings - Reset Procedure to reset the AUI or either Exciter: 1.
  • Page 104 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Upgrade software The Upgrade Software page allows for uploading a suite of software upgrade files (.tgz files) via remote connection. Navigate the page as described below. Please note that users cannot add upgrade files via the local AUI touchscreen.
  • Page 105 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Exciter TCXO This system setting allows users to calibrate the internal clock to a user supplied external high precision 10MHz clock reference (e.g. GPS synchronized 10MHz clock). Once this external 10MHz clock reference is connected, the 10MHz Int-Ext Offset field will display the difference between the internal and external frequencies (in ppm).
  • Page 106 NV15/NV20 Operations and Maintenance Manual Operating the transmitter • Forward Tap Delay - This field displays the time delay (in unit taps) between the forward path signal from the exciter and the reverse path signal into the exciter, fed back from the output of the transmitter.
  • Page 107 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Audio input calibration This system setting (see Figure 2.56) supports the calibration of analog and MPX (composite) audio inputs. The peak meter value of each calibrated audio input ( Analog Left Peak , Analog Right Peak , MPX Peak , MPX SCA Peak , Int.
  • Page 108 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Turn-on delay This system setting (see Figure 2.57) allows users to delay the start-up (RF on) of the transmitter when recovering from an ac power loss, in order to limit the simultaneous power demand from multiple transmitters on a common generator by staggering their turn on sequence.
  • Page 109 Note: Default Exciter Power is transmitter specific; NV3.5/NV5 = 11W; NV7.5/NV10 = 25W; NV15/NV20 = 65W and NV30/NV40 = 130W. Default IPA Power at 98MHz is 110W. These values are factory determined and should not require adjustment. These values apply for FM mode only.
  • Page 110 NV15/NV20 Operations and Maintenance Manual Operating the transmitter FM polarity This system setting (see Figure 2.60) allows users to invert the polarity of the frequency modulation; (i.e. positive going modulation signal yields positive deviation; or positive going modulation signal yields negative deviation). Options are Normal (default) or Inverted .
  • Page 111 NV15/NV20 Operations and Maintenance Manual Operating the transmitter User accounts Depending on user permission rights, you can set up accounts to allow certain users to access and control features of the AUI using the User Accounts page - see Figure 2.61.
  • Page 112 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Setting user permission level There are four levels of permission that can be assigned to users, each with their own specific function. All users have permission to change their own username and password, but are otherwise limited to the following functions: •...
  • Page 113 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Changing the password To change your password, press the Change Password button. A menu appears that prompts you to enter the old password, new password and confirmation of the new password. Press Apply to save or Cancel to exit this menu (see Figure 2.62 on page...
  • Page 114 NV15/NV20 Operations and Maintenance Manual Operating the transmitter • All Other Settings - Allows the user to adjust all settings not mentioned above, except for administrating user accounts. 5. Press Apply to assign the new permissions to the selected user.

  • Page 115: Changeover Page

    (manual) changeover is desired. Auto setting cannot be changed if the selected Standby Exciter button is No . Note: If standby exciter must be removed for service, Nautel recommends you set Auto Exciter Changeover to No while the standby exciter is unavailable for operation, instead of temporarily setting Standby Exciter to No .

  • Page 116: User Settings

    NV15/NV20 Operations and Maintenance Manual Operating the transmitter User settings The User Settings page (see Figure 2.64 on page 2-85) allows operators to modify various custom user settings such as network and email notification settings. This section includes the following topics: •...
  • Page 117 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Figure 2.64: User Settings Page Setting up the network The Network Setup page (see Figure 2.65) allows you configure parameters for connecting the AUI to your network. Modify network settings as follows: Figure 2.65: User Settings - Setting up the Network...
  • Page 118 Figure 2.65 on page 2-85). Note: Nautel recommends that the following settings be entered/vetted by a qualified Network Administrator. 3. Enter the following parameters (where applicable): Mac Address - Displays a number that serves as unique network adapter identifier. This •...
  • Page 119 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Port Number - Used to identify the senders and receivers of messages. Also supports • port forwarding (remapping) which allows the AUI of multiple NV Series transmitters to be accessed on the same network. See your network router documentation for additional remapping information and instructions.
  • Page 120 2. Select the Email Configuration option (left-side of the screen) to display related information and associated parameters on the right-side of the screen. Note: Nautel recommends that the following settings be entered/vetted by a qualified Network Administrator. 3. Enter the following parameters: •...
  • Page 121 NV15/NV20 Operations and Maintenance Manual Operating the transmitter arrives at a server. Typically, this is set to 25 for unencrypted SMTP systems and 843 for encrypted email. • Transmitter Name - Enter an identification for the transmitter/station (e.g., NV30_W###). This name will be included in notification emails.
  • Page 122 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Notifications The Notifications page (see Figure 2.67) allows you to configure email notifications that are sent upon user-selected alarm occurrences. Figure 2.67: User Settings - Notifications notification devices Use arrows to add or remove alarms to...
  • Page 123 NV15/NV20 Operations and Maintenance Manual Operating the transmitter • Select an existing notification and press Delete to remove a notification from the list. The window that opens for both Add and Edit allows you to edit a notification name, one or more recipient email addresses (separated by a semicolon), and the notification device.
  • Page 124 NV15/NV20 Operations and Maintenance Manual Operating the transmitter • E2X Port - The exgine expects E2X on port 9000. Some non-Nautel Exporters utilize port 11000 instead. • Mac Address - Displays a number that serves as unique network adapter identifier. This is set by the manufacturer and is displayed for informational purposes only.
  • Page 125 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 126 NV15/NV20 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 the associated traps (see Figure 2.70). Figure 2.70: User Settings - SNMP Configuration - Agent Tab...
  • Page 127 NV15/NV20 Operations and Maintenance Manual Operating the transmitter • Trap Receiver IP: Enter the IP address of the computer to which the SNMP agent will send trap notifications. The computer must be running an SNMP application that is configured to receive traps. The SNMP agent will send trap notifications to only one recipient.
  • Page 128 NV15/NV20 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 2.72). To view this page, select Critical Parameters from the User Settings page.
  • Page 129 NV15/NV20 Operations and Maintenance Manual Operating the transmitter External 10MHz This setting (see Figure 2.73) allows the user to mask the associated 10MHz alarm from appearing on the Status page if it isn't being used If an external 10MHz source is being used, Yes should be selected as this ensures that an alarm will be activated on the Status page should the external signal be lost.
  • Page 130 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Digital audio inputs setting (see Figure 2.74) allows selection of the input (AES/EBU #1, Digital Audio Inputs AES/EBU #2 or Optical) that is mapped to the primary and secondary digital inputs via the presets Audio Source setting.
  • Page 131 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Spectrum mask Using the Spectrum Mask setting (see Figure 2.75) users can select the appropriate FM mask standard ( FCC, ETSI or None ) being used by the analyzer. The selection affects the mask lines on the Spectrum Analyzer instrument.
  • Page 132 NV15/NV20 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 Time Setup page contains editable 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 133 The accuracy of the NTP synchronization is related to the distance to the server. For this reason, Nautel recommends that you choose servers in the same country as the equipment. If this is not possible, attempt to connect to servers from the same continent.
  • Page 134 NV15/NV20 Operations and Maintenance Manual Operating the transmitter • Remote Name: Displays the host name of the referenced time source. An asterisk (*) in the first column marks the reference time source that is currently preferred by the NTP daemon.
  • Page 135 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Setting call sign/ID The Call Sign/ID screen (see Figure 2.79) allows users to set a name that identifies the transmitter on the AUI. This identification will be displayed in brackets on the top transmitter banner of the AUI...

  • Page 136: Remote I/O Page

    Figure 2.81). To view the Remote I/O page, select Remote I/O from the Menu options. Refer also to the NV15/NV20 Installation Manual for information on remote inputs and outputs and their factory default settings. This section includes the following topics: •...
  • Page 137 Remote . That setting can only be made by a local user using the front panel AUI. Nautel presets the digital inputs prior to shipping. See the NV15/NV20 Installation Manual for a list of default inputs and outputs.
  • Page 138 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Figure 2.82: Remote I/O - Digital Inputs Control You can configure the active/inactive logic for each of the 24 digital inputs. Press the Control bar to display the applicable drop-down menu options, which may include: •...
  • Page 139 2.83, you can configure up to 24 digital outputs that indicate either the presence of various alarms or the status of operator controlled circuits. Nautel presets the digital outputs prior to shipping. See the NV15/NV20 Installation Manual for details. Figure 2.83: Digital Outputs Page Issue 3.2 2013-10-01...
  • Page 140 NV15/NV20 Operations and Maintenance Manual Operating the transmitter Select the desired digital output (1 through 24) from the list. The Channel and Control settings for the selected output, as well as the current logic Level (1 or 0), are displayed on the right-hand side of the page.
  • Page 141 NV15/NV20 Operations and Maintenance Manual Operating the transmitter if the selected channel is Auto Changeover Enabled , the drop-down options are: • Output Low When Enabled . Logic ‘0’ (low) indicates the output is true (Enabled); Logic ‘1’ (high) indicates the output is false (Disabled).
  • Page 142 NV15/NV20 Operations and Maintenance Manual Operating the transmitter • IPA Voltage • Average IPA Output Power • Controller Temperature The values associated with each of these fixed meters (cannot be changed to another meter) are of a linear nature so that changes made to the Full Scale Voltage field (allowable range is 1- 6 V, defaulted...

  • Page 143: Routine Maintenance

    Inspecting lightning protection systems - see page 3-8 Scheduled maintenance Scheduled maintenance consists of performing a visual inspection of the NV15/NV20 at scheduled intervals. The recommended minimum time between scheduled maintenance visits is three months. Local operating and environmental conditions may dictate more frequent visits, while in remote sites less frequent visits may be acceptable.
  • Page 144 – When complete, reconnect the DC INPUT plug to the monitor and re-install the cover. Checking hardware All hardware must be checked at least once a year. Thermal cycling from turning the NV15/NV20 on and off will require more frequent checks.
  • Page 145 Take the following steps to replace an NV15/NV20 air filter: 1. Order a new filter or filters, as necessary. You can order a standard sized filter from Nautel (Nautel Part # HR124) or from the manufacturer (20” x 25” x 2”, American Air Filter PerfectPleat HC M8 MERV 8, M7 MERV 7, or equivalent) or obtain one from any local supplier of HVAC supplies.
  • Page 146 NV15/NV20 Operations and Maintenance Manual Routine maintenance Figure 3.1: Replacing Air Filters FRONT VIEW REAR VIEW UPPER PANEL FILTERS Quarter-turn fasteners (3 per panel) LOWER PANEL FILTER FRONT DOOR TOTAL NUMBER OF FILTERS = 4 FILTER Page 3-4 Issue 3.2 2013-10-01...

  • Page 147: Performing On-Air Checks

    Critical Parameters sheet. Note: Nautel completes the Critical Parameters sheet with the transmitter terminated into a precision 50 ohm load. Measurements made on site into a dummy load or station antenna may not yield the same readings. Slight variances are acceptable. The data is provided as a troubleshooting aid.

  • Page 148: Replacing The Control/Interface Pwb Battery

    Interval Every 12 months. Parts and tools Replacement battery: 3 V lithium coin cell, 20 mm (Nautel Part # BBLT01, Panasonic # CR2032). Procedure Perform the following steps to replace the battery: 1. Ensure ac power is being applied to the transmitter.

  • Page 149: Replacing The Nve Exciter Pwb Battery

    Interval Every 12 months. Parts and tools Replacement battery: 3 V lithium coin cell, 20 mm (Nautel Part # BBLT01, Panasonic # CR2032). Procedure Perform the following steps to replace the battery: 1. Ensure ac power is being applied to the transmitter.

  • Page 150: Inspecting Lightning Protection Systems

    NV15/NV20 Operations and Maintenance Manual Routine maintenance Inspecting lightning protection systems You should inspect the lightning protection systems that are connected to your NV15/NV20 transmitter, ac power, RF feedline, antenna and tower periodically to ensure that your site, equipment and personnel are fully protected.

  • Page 151: Non-Standard Maintenance

    AUI, Server, Controller, Exciter and RF Modules. 2. Contact Nautel for the most recent software revision and receive a new compact flash card (which contains upgrade *.tgz file) or download *.tgz file to a laptop or network location.
  • Page 152 1. From the transmitter AUI, go to Menu / User Settings / Network Setup , and record your current network settings (IP Address, Subnet Mask, Default Gateway). Contact Nautel for the most recent software revision and receive a new compact flash card (which contains upgrade *.tgz file) or download *.tgz file to a laptop or network location.
  • Page 153 3. In the Internet Protocol (TCP/IP) Properties window, select Use the following IP address . 4. At the transmitter login screen enter: – User: “Nautel” or “****”, where **** is the user assigned user name – Password: none (default) or “****”, where **** is the user assigned password 5.

  • Page 154: Improving Transmitter Performance For Iboc Presets

    NV15/NV20 Operations and Maintenance Manual Non-standard maintenance Improving transmitter performance for IBOC presets After a power or frequency change to an operating FM+HD or HD preset, optimize the transmitter’s performance as follows: Parts and tools – Transmitter’s AUI Preliminary checks 1.
  • Page 155 NV15/NV20 Operations and Maintenance Manual Non-standard maintenance Figure 4.1: Spectrum Analyzer plot on AUI margin between mask and spectrum for intermod products Figure 4.2: Presets Page - Adjusting HD PA Volts setting Issue 3.2 2013-10-01 Page 4-5...

  • Page 156: Changing The Rf Output Connector

    – 3-1/8 inch EIA, M10 hardware (kit # 206-5225-01); standard for NV20/NV15 Procedure Take the following steps to change an NV15/NV20 RF output connector (See Figures 4.1 and 4.2 as guides for assembly and disassembly): 1. Determine the size of the new RF output connector and order the appropriate kit from Nautel (see “Parts and tools”...
  • Page 157 NV15/NV20 Operations and Maintenance Manual Non-standard maintenance 6. Remove the old output connector cup, noting it is secured to the output power probe with an M10 hex bolt. 7. Install the new output connector cup using an M10 hex bolt.
  • Page 158 NV15/NV20 Operations and Maintenance Manual Non-standard maintenance Figure 4.3: RF Output Connector Assembly Detail - 4-1/16 inch EIA OUTPUT PLATE SPACER PLATES OUTPUT CONNECTOR Page 4-8 Issue 3.2 2013-10-01...
  • Page 159 NV15/NV20 Operations and Maintenance Manual Non-standard maintenance Figure 4.4: RF Output Connector Assembly Detail - 3-1/8 inch EIA OUTPUT PLATE SPACER PLATES OUTPUT CONNECTOR 206-6530-01 Issue 3.2 2013-10-01 Page 4-9...

  • Page 160: Bypassing The Ups Interface Option

    NV15/NV20 Operations and Maintenance Manual Non-standard maintenance Bypassing the UPS interface option If you wish to bypass the UPS interface assembly (i.e. disable use of a UPS source), proceed as follows: Interval As required. Parts and tools None. Procedure 1. Disconnect any user-provided ac power cables connected to the UPS interface assembly at the top of the transmitter.
  • Page 161 NV15/NV20 Operations and Maintenance Manual Non-standard maintenance Figure 4.5: Ac Distribution Assembly Location AC DISTRIBUTION ASSEMBLY REAR VIEW Issue 3.2 2013-10-01 Page 4-11...
  • Page 162 NV15/NV20 Operations and Maintenance Manual Non-standard maintenance Page 4-12 Issue 3.2 2013-10-01...

  • Page 163: List Of Terms

    List of terms Section 5: List of terms This section defines some of the terms that are used in Nautel documentation. Audio Engineering Society/European Broadcasting Union (AES/EBU) is the name of a AES-EBU. digital audio transfer standard. The AES/EBU digital interface is usually implemented using 3-pin XLR connectors (the same type connector used in professional microphones).
  • Page 164 NV15/NV20 Operations and Maintenance Manual List of terms A setting that controls power level, frequency and audio parameters. The NV15/NV20 Preset. allows you to pre-program multiple presets. Printed Wiring Board. PWB. Single Board Computer. Refers to the CPU and associated components located on the back of SBC.

  • Page 166: Issue 3.2 2013-10-01

    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 2013 NAUTEL. All rights reserved.

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