Nautel NX300 Manuel utilisateur

NX300 Transmitter

Operations and Maintenance

Manual

Document:NHB-NX300-OPS-3.0

Issue: 3.0 2012-11-01

Status: Standard

Nautel Limited

10089 Peggy’s Cove Road

Hackett’s Cove, NS Canada B3Z 3J4

Phone: +1.902.823.3900 or

Toll Free: +1.877.6NAUTEL (6628835) (Canada & USA only)

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: [email protected]

Web: www.nautel.com

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.

NX300 Operations and Maintenance Manual Table of contents

Page v

Contents

Release control record vii

Description 1-1

Ac-dc power stage 1-1

Exciter stage 1-2

Control/monitor stage 1-4

RF power stage 1-5

RF output network 1-5

Operating the transmitter 2-1

Using the AUI 2-2

Home page - describing the first page 2-17

Menu page - describing transmitter operations 2-18

Viewing Transmitter Log 2-20

Instrument Panels - viewing displays 2-27

Meters page - viewing real-time meters 2-42

Presets - editing operational settings 2-48

Preset Scheduler 2-61

Status - viewing transmitter status 2-64

User Accounts 2-66

User Settings 2-71

System Settings page 2-89

Precorrection Settings page 2-97

Changeover page - changing exciter transfer settings 2-106

Factory Settings 2-107

Remote I/O page 2-116

Playlist Manager 2-121

Using the key-controlled access system 2-126

NX300 Operations and Maintenance Manual Table of contents

Page vi Issue 3.0 2012-11-01

Routine maintenance 3-1

Scheduled maintenance 3-1

Replacing a damaged air filter 3-2

Performing on-air checks 3-3

Replacing the control/interface PWB battery 3-4

Inspecting lightning protection systems 3-5

Non-standard maintenance 4-1

Upgrading software 4-1

List of terms 5-1

NX300 Operations and Maintenance Manual

Issue 3.0 2012-11-01 Page vii

Release control record

Issue Date Reason

3.0 2012-11-01 Release 3 of product (NARA54B)

Software Release NX4.0

NX300 Operations and Maintenance Manual

Page viii Issue 3.0 2012-11-01

NX300 Operations and Maintenance Manual Description

Issue 3.0 2012-11-01 Page 1-1

Section 1: Description

Refer to the functional block diagram: Figure 1.6 on page 1-11.

This section provides a high-level description of the transmitter’s key sections. The transmitter

circuitry is subdivided into five basic stages.

•Ac-dc power stage

•Exciter stage - see page 1-2

•Control/monitor stage - see page 1-4

•RF power stage - see page 1-5

•RF output network - see page 1-5 (includes combiner and filter)

NX300 electrical schematics

Some descriptions in this section refer to electrical schematics (SD-#s) . These are located at the end

of the NX300 Troubleshooting Manual.

Redundancy

The NX300 features redundancy in all key systems:

• RF power modules

• Exciters

• Cooling fans

Ac-dc power stage

See electrical schematic SD-1. The ac/dc power supply stage contains the input power transformer

that receives the main ac input to the transmitter. It also contains the transmitter’s low voltage power

supplies and rack interface PWB. The ac/dc power supply stage also include a three-phase SCR

rectifier assembly, Hall Effect current sensor, and B+ distribution assemblies. With the exception of

the power transformer, which has its own cabinet, each cabinet in the transmitter system contains its

own ac/dc power stage components.

NX300 Operations and Maintenance Manual Description

Page 1-2 Issue 3.0 2012-11-01

The secondary of the power transformer is applied to the SCR rectifier assembly to create the

transmitter’s B+ voltage. The output of the rectifier assembly is fed through the Hall Effect current

sensor, which supplies a dc current signal to the rack interface PWB. The rectifier assembly output is

applied to the B+ distribution assemblies, which then provide the B+ voltage to the RF power

modules, and a B+ sample to the rack interface PWB.

One phase of the power transformer’s secondary is also used to provide a source for the low voltage

dc power supplies and an ac sample for the rack interface PWB. The low voltage power supply

outputs (+48 V, +15 V and +12 V) are distributed throughout the transmitter via the rack interface

PWB.

Ac power transformer

The NX300’s power transformer can be set to use a range of input voltages. See Section 4,

“Connecting transformer taps/load wiring” on page 4-1 in the NX300 Installation Manual.

Exciter stage

See electrical schematic SD-2 and Figure 1.1 on page 1-3. The exciter stage consists of digital AM

exciter PWBs A (A11A2) and B (A11A3), RF drive distribution PWB (A16), and PDM distribution

PWB (A17). 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. The control/interface PWB acts as

an interface point for audio inputs and RF drive and PDM outputs.

Digital AM exciter PWBs

Digital AM exciter PWBs A (A11A2) and B (A11A3) accept audio or IBOC inputs from an

integrated DRM exciter or Exgine card and generate fully digital RF drive carrier frequency sources

and interphase PDM drive signals for the power amplifiers and modulators in the RF power modules.

Audio input can be applied as as analog (balanced or AES-EBU) or digital (I/Q in AES/EBU or

CMOS format). All audio inputs are digitized, as necessary, and sample rate converted. A DSP

provides initial data conditioning, including the initial filtering and interpolation of incoming audio or

digital radio data.

An FPGA generates the digital PDM signals and synthesizes the carrier frequency RF drive signal. It

also performs digital up-conversion, reverse path demodulation and downconversion and B+ voltage

compensation.

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