Nautel NX5 AM Manual

3: OPERATION & MAINTENANCE

MANUAL

NX5 AM

TRANSMITTER

Document ID: NHB-NX05-OPS

Version: 0.1

Issue Date: 2015-08-01

Status: Preliminary

VERSION 0.1 2015-08-01 PAGE III

NX5 OPERATION & MAINTENANCE MANUAL

Contact Information

Nautel Limited

10089 Peggy’s Cove Road

Hackett’s Cove, NS Canada B3Z 3J4

Toll Free: +1.877.6NAUTEL (662.8835)

(Canada & USA only) or

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: [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.

For verification of materials, the reader is encouraged to consult the

respective manufacturer's most recent publication on the official

website or through contact with Customer Service.

NX5 OPERATION & MAINTENANCE MANUAL TABLE OF CONTENTS

VERSION 0.1 2015-08-01 PAGE 3.V

CONTENTS

Contact Information 3.1.iii

Release Control Record vii

Description 3.1.1

Ac-Dc Power Stage 3.1.2

Exciter Stage 3.1.3

Control/Monitor Stage 3.1.5

RF Power Stage 3.1.7

RF Output Network 3.1.8

Operating the Transmitter 3.2.1

User Interface Options 3.2.4

Viewing Transmitter Log 3.2.22

Viewing Instrument Panels 3.2.31

Available Instrument Panels 3.2.35

Viewing Real-Time Meters 3.2.48

Presets - Editing Operational Settings 3.2.58

Resetting Alarms 3.2.84

Viewing Transmitter Status - Remote AUI 3.2.85

User Settings 3.2.87

User Settings - Front Panel UI 3.2.111

Precorrection Settings 3.2.114

User Accounts 3.2.123

System Settings - Remote AUI 3.2.127

System Settings - Front Panel UI 3.2.134

Factory Settings 3.2.147

Configuring Remote Inputs and Outputs 3.2.163

Preset Scheduler 3.2.173

NX5 OPERATION & MAINTENANCE MANUAL TABLE OF CONTENTS

PAGE 3.VI VERSION 0.1 2015-08-01

Audio Player 3.2.176

Changing Exciter Transfer Settings 3.2.182

Routine maintenance 3.3.1

Upgrading Software 3.3.1

Scheduled Maintenance 3.3.5

Replacing the Air Filter 3.3.6

Performing On-Air Checks 3.3.8

Replacing the Control/Interface PWB Battery 3.3.9

Inspecting Lightning Protection Systems 3.3.11

List of terms 3.4.1

NX5 OPERATION & MAINTENANCE MANUAL

VERSION 0.1 2015-08-01 PAGE 3.VII

Release Control Record

ISSUE DATE REASON

0.1 2015-08-01 Initial Release of manual. Supports NX5 hardware NARA66.

Supports NX SW version 4.5 and higher.

NX5 OPERATION & MAINTENANCE MANUAL

PAGE 3.VIII VERSION 0.1 2015-08-01

NX5 OPERATION & MAINTENANCE MANUAL DESCRIPTION

VERSION 0.1 2015-08-01 PAGE 3.1.1

SECTION 3.1: DESCRIPTION

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 3.1.3

Control/Monitor Stage - see page 3.1.5

RF Power Stage - see page 3.1.7

RF Output Network - see page 3.1.8 (includes combiner and filter)

Refer to the functional block diagram: Figure 3.1.5 on page 3.1.13.

NX5 Electrical Schematics

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

the

NX5 Troubleshooting Manual

Redundancy

The NX5 features redundancy in the following key systems:

Exciters (optional)

RF power modules

Cooling fans

NX5 OPERATION & MAINTENANCE MANUAL DESCRIPTION

PAGE 3.1.2 VERSION 0.1 2015-08-01

Ac-Dc Power Stage

See Figure 3.1.5 on page 3.1.13 and 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

includes a three-phase SCR rectifier assembly, B+ current sensor, B+ distribution assembly and arc

detector assembly.

Ac Power Transformer

The NX5’s power transformer can be set to use a range of input voltages. See Section 2.4, “Connecting

Ac Power” on page 2.4.1 in the

NX5 Installation Manual

High Voltage B+ Supply

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 B+ current sensor,

which supplies a B+ current sample to the rack interface PWB. The rectifier assembly output is applied

to a choke input filter and the B+ distribution assembly, which then provides the B+ voltage to the RF

power modules.

The B+ discharge relay, which is part of the B+ distribution assembly, opens when ac power is applied

and closes and ac power is removed, applying a high power discharge resistor across the B+ bus to

quickly discharge the voltage. When the discharge relay closes, a microswitch ensures the SCR rectifier

is immediately inhibited.

Low Voltage Power Supplies

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 and +15 V) are distributed throughout the transmitter via the rack interface PWB. The +48 V

power supply sources the transmitter’s cooling fans. An inhibit signal, controlled by the rack interface

PWB, is applied to the +48 V power supply to turn the fans on and off. The +15 V power supply sources

all of the low voltage control circuitry.

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