Nautel NX50 User manual

NX50 Transmitter
Operations and Maintenance
Manual
Document:NHB-NX50-OPS
Issue: 3.3 2016-02-08
Status: Standard

Nautel Limited
10089 Peggy’s Cove Road
Hackett’s Cove, NS Canada B3Z 3J4
Phone: [phone] or
Toll Free: +1.877.6NAUTEL (6628835) (Canada & USA only)
Fax: [phone]
Nautel Inc.
201 Target Industrial Circle
Bangor, Maine USA 04401
Phone: [phone]
Fax: [phone]
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.
© Copyright 2016 NAUTEL. All rights reserved.

NX50 Operations and Maintenance Manual Table of contents
Page v
Contents
Release control record vii
Description 1-1
Ac-Dc Power Stage 1-2
Exciter Stage 1-3
Control/Monitor Stage 1-5
RF Power Stage 1-6
RF Output Network 1-6
Operating the transmitter 2-1
Using the AUI 2-2
Home page - describing the first page 2-18
Menu page - describing transmitter operations 2-19
Viewing Transmitter Log 2-21
Instrument Panels - viewing displays 2-28
Meters page - viewing real-time meters 2-43
Presets - editing operational settings 2-49
Preset Scheduler 2-64
Status - viewing transmitter status 2-67
User Accounts 2-69
User Settings 2-74
System Settings page 2-92
Precorrection Settings page 2-101
Changeover page - changing exciter transfer settings 2-110
Factory Settings 2-111
Remote I/O page 2-120
Audio Player 2-125
Using the ac disconnect switch 2-130

NX50 Operations and Maintenance Manual Table of contents
Page vi Issue 3.3 2016-02-08
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
Touchscreen Calibration 4-4
List of terms 5-1

NX50 Operations and Maintenance Manual
Issue 3.3 2016-02-08 Page vii
Release control record
Issue Date Reason
3.0 2012-11-01 Release 3 of transmitter (NARA53B)
Software Release NX4.0
3.1 2014-10-14 Software Release NX4.3 updates including Nautel
Phone Home; changed “safety interlock switch” to
“ac disconnect switch”
3.2 2015-10-30 Various changes to Section 2 for software release
NX 4.5.
3.3 2016-02-08 Various changes to Section 2 for software release
NX 4.6.

NX50 Operations and Maintenance Manual
Page viii Issue 3.3 2016-02-08

NX50 Operations and Maintenance Manual Description
Issue 3.3 2016-02-08 Page 1-1
Section 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 1-3
•Control/Monitor Stage - see page 1-5
•RF Power Stage - see page 1-6
•RF Output Network - see page 1-6 (includes combiner and filter)
Refer to the functional block diagram: see Figure 1.6 on page 1-11.
NX50 Electrical Schematics
Some descriptions in this section refer to electrical schematics (SD-#s) . These are located at the end
of the NX50 Troubleshooting Manual.
Redundancy
The NX50 features redundancy in all key systems:
• RF power modules
• Exciters
• Cooling fans

NX50 Operations and Maintenance Manual Description
Page 1-2 Issue 3.3 2016-02-08
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.
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 NX50’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 NX50 Installation Manual.