Nautel J1000 Installation guide

J1000

1,000 Watt

AM Broadcast

Transmitter

Installation and Operation Manual

Issue 4.0 .........................01 November 2007

Nautel Limited

10089 Peggy's Cove Road,

Hackett's Cove, NS, Canada B3Z 3J4

T.877 6 nautel (628835) or +1.902.823.2233

F.+1.902.823.3183 info@nautel.com

U.S. customers please contact:

Nautel Inc.

201 Target Industrial Circle, Bangor ME 04401

T.877 6 nautel (628835) or +1.207.947.8200

F.+1.207.947.3693 info@nautel.com

e-mail: [email protected]

www.nautel.com

J1000 Installation and Operation Manual Issue 4.0

Warranty Information Page 1

Warranty

By Nautel Limited/Nautel Inc.

Nautel Limited/Nautel Incorporated, hereinafter referred to as Nautel, guarantees all mechanical and electrical

parts of the equipment for a period of thirteen months from date of shipment.

1. A “Part Failure” is defined as a part that is defective or does not perform as required, provided the following

criteria are met:

(a) When the equipment is operated within the design parameters.

(b) When the equipment is installed and adjusted according to Nautel’s procedures, as stated in the

Installation and Operation Manual.

2. Nautel shall provide replacement parts at no cost to the customer for all “Parts” that become defective during

the warranty period once the defective part has been returned to Nautel.

3. In the event a “Part” fails during the warranty period and causes damage to a sub-assembly that cannot be

readily repaired in the field, the entire damaged sub-assembly may be returned to Nautel for repair. Repairs

will be made at no charge to the customer.

4. Where warranty replacements or repairs are provided under items 2 or 3, Nautel will pay that part of the

shipping costs incurred in returning the part/assembly to the customer.

5. Warranty replacement parts and repairs which are provided under items 2 or 3 are guaranteed for a period of

ninety days from the date of shipment, or until the end of the original warranty period, whichever occurs later.

6. Nautel will only assume responsibility for any charges incurred by Nautel employees.

7. Nautel has the privilege of investigating whether failures have been caused by factors beyond Nautel’s

control.

8. Nautel is in no way liable for any consequential damages arising from the use of this equipment.

9. When requesting a warranty repair or replacement, please provide complete and accurate information. The

procedure for requesting a warranty item is outlined in the paragraph “Equipment Being Returned to Nautel”

on page two of this warranty section. The same procedure applies when ordering spare or replacement

parts not covered under the warranty.

Customer Service Notice

A ‘Technical Assistance’ and ‘Plug-in Module Exchange’ service is available to Nautel

transmitter owners.

Issue 4.0 J1000 Installation and Operation Manual

Page 2 Warranty Information

Factory Support

TECHNICAL ASSISTANCE

Nautel's field service department provides telephone technical assistance 24 hours a day, seven days a week. Requests via facsimile

or e-mail received after Nautel's normal working hours are responded to the next working day. Contact the appropriate field service

centre from the following:

U.S.A. customers use: Nautel Incorporated T.+1.207.947.8200 (24 hours) or 877 6 nautel (628835)

201 Target Industrial Circle F.+1.207.947.3693

Bangor, Maine 04401

All other customers use: Nautel Limited T. +1.902.823.3900 (24 hours) or 877 6 nautel (628835)

10089 Peggy’s Cove Road, F. +1.902.823.3183

Hackett’s Cove, NS, Canada E-Mail support@nautel.com

B3Z 3J4 Web www.nautel.com

MODULE EXCHANGE SERVICE

In order to provide Nautel customers with fast and efficient service in the event of a problem, Nautel operates a factory rebuilt

module exchange service which takes full advantage of the high degree of module redundancy in Nautel equipment. This module

exchange service is operated from Nautel’s factory in Bangor, Maine and Hackett’s Cove, Nova Scotia. These two locations allow

us to provide a quick turn around service to keep our customers on the air. During the transmitter’s warranty period, up to thirteen

months from shipment, repair and exchange of modules is at no charge to the customer. When the warranty has expired, a charge

of 80% of the list price for all exchanged modules is made. If the faulty module is returned to Nautel within 30 days, a credit is

issued reducing this charge by one half to 40% of the list price. U.S.A. customers are required to contact our Bangor, Maine

facility. Canadian and overseas customers should contact our Nova Scotia, Canada facility.

EQUIPMENT BEING RETURNED TO NAUTEL

For all equipment being returned to Nautel and all requests for repairs or replacements:

• Obtain an RMA number from Nautel (you must have an RMA number to return equipment)

• Mark the item as 'field return'

• Mark the item with the RMA number assigned by Nautel

• Address the item to the appropriate Nautel facility

Please provide complete and accurate information regarding the equipment being returned. This will ensure Nautel can provide

prompt attention so that replacement parts can be shipped as soon as possible. Refer to the nameplate on the transmitter and/or the

appropriate module/assembly to obtain name, type, part and serial number information. Refer to the parts list of this manual or the

appropriate service instruction manual for additional ordering information.

The following information should accompany each request:

* Model of Equipment

* Serial number of Equipment

* Name of Part/Assembly

Serial number of Part/Assembly

* Complete reference designation of Part/Assembly

* Nautel's part number of Part/Assembly

* OEM's part number of Part/Assembly

Number of hours in Use

Nature of defect

* Return shipping address

* Denotes minimum information required to order spare/replacement parts

J1000 Installation and Operation Manual Issue 4.0

Safety Information Page 1

SAFETY

Symbols

The following are general definitions for safety symbols used on the equipment or in the Installation and

Operation Manual:

DANGER – HIGH VOLTAGE

Indicates dangerous voltages (in excess of 72 volts), capable of causing a fatal

electrical shock, are present on or near parts bearing this label.

GROUND (EARTH)

Used with wiring terminals to indicate the terminal must be connected to earth ground

before operating equipment. If power is supplied without grounding the equipment,

there is a risk of receiving a severe or fatal electrical shock. Also used on electrical

schematics to indicate a part that is connected to earth ground.

GROUND (PROTECTIVE or SAFETY)

Used with protective (safety) conductor terminals to indicate the terminal must be

connected to ground before operating the equipment. If power is supplied without

grounding the equipment, there is a risk of receiving a severe or fatal electrical shock.

WARNING A WARNING denotes a hazard. It identifies an operating procedure or condition

which, if not strictly observed or adhered to, could result in injury or death to

personnel. Throughout the Installation and Operation Manual, a WARNING will

immediately precede the text to which it applies.

CAUTION A CAUTION denotes a hazard. It identifies an operating procedure or condition

which, if not strictly observed or adhered to, could result in damage to, or destruction

of the equipment. Throughout the Installation and Operation Manual, a CAUTION

will immediately precede the text to which it applies.

NOTE A NOTE denotes important information pertaining to an operating procedure,

condition, statement, etc., which is essential to highlight. A NOTE may precede or

follow the text to which it applies.

Issue 4.0 J1000 Installation and Operation Manual

Page 2 Safety Information

SAFETY

Artificial Respiration (Mouth-to-Mouth)

(a) START MOUTH-TO-MOUTH BREATHING IMMEDIATELY. SECONDS COUNT.

Do not wait to loosen clothing, warm the casualty, or apply stimulants.

(b) ASSESS RESPONSIVENESS OF CASUALTY. Do not jar casualty

or cause further physical injury (Figure 1)

(c) IF POSSIBLE, SEND A BYSTANDER TO GET MEDICAL HELP.

Do not leave casualty unattended (Figure 2)

(d) CHECK CAROTID PULSE (Figure 3)

(e) LAY CASUALTY ON HIS/HER BACK and place any available jacket

or blanket under his/her shoulders.

(f) TILT THE HEAD BACK AND LIFT THE CHIN to open the airway (Figure 4)

(g) PINCH CASUALTY’S NOSE AND EXHALE TWO

SLOW BREATHS INTO CASUALTY (Figure 5)

(h) REMOVE YOUR MOUTH and check for breathing (Figure 6)

(i) CONTINUE GIVING ONE BREATH EVERY FIVE SECONDS without interruption.

If any air is retained in the stomach after exhalation by casualty, press gently on

stomach to expel air.

(j) IF CHEST DOES NOT RISE CHECK for obstruction in casualty’s mouth.

Clear foreign material using your finger, tissues, etc. Use chin lift and

recommence mouth-to-mouth breathing.

(k) WHILE MOUTH-TO-MOUTH BREATHING IS CONTINUED

have someone else:

- Loosen casualty’s clothing.

- Keep the casualty warm.

(l) DON’T GIVE UP. Continue without interruption until the casualty is revived,

or until a doctor pronounces the casualty dead. Four hours or more may be required.

(m) DO NOT PROVIDE ANYTHING ORALLY while victim is unconscious.

5

3

1

2

4

6

J1000 Installation and Operation Manual Issue 4.0

Safety Information Page 3

SAFETY

General Rules for Treatment for Burns, Bleeding, and Shock

1. After casualty has revived, treat for injuries and shock.

2. Reassure casualty.

3. Try to make him comfortable.

4. Keep him reasonably warm but do not apply heat.

5. If thirsty, liquids may be given but no alcohol (no liquids should be given in cases of severe burns).

6. Treat burns or wounds. Infection danger in treating burns or wounds is very great so ensure hands are

clean and do not handle affected areas more than necessary.

7. Do not apply salves, grease, etc. to burns.

8. Do not remove burned clothing that adheres to the skin or breaks blisters.

9. Cover the burn with a dry sterile dressing, piece of sheeting, etc.

10. Bandage lightly over blisters where care must be taken to cover and not to break.

11. If wound is bleeding severely, elevate affected area, except in the case of a fracture.

12. Expose wound and apply pressure.

13. Apply dressing, pad and bandage.

14. For burns and bleeding, immobilize injured part using splints if necessary and keep patient in restful

position during removal to hospital or expert medical attention.

15. In all cases, send for medical aid immediately.

Issue 4.0 J1000 Installation and Operation Manual

Page 4 Safety Information

SAFETY

Electric Shock - Rescue Methods

Electricity can damage the body in a number of ways. It may interfere with the proper functioning of the

nervous system and the heart action, subject the body to extreme heat and can cause severe muscular

contractions. The path that the current of electricity takes through the body is important. Currents that pass

from hand to hand or from hand to foot may pass directly through the heart and upset its normal

functioning. This threat to life is related to the amount of current or amperage that will flow through a

victim's body. Very little current (as little as 10 mA) can result in severe shock or death.

Speed in the application of first aid measures is absolutely essential in cases of electrical injury. As soon

as the victim is freed safely from the source of the electrical current, artificial respiration should be

commenced immediately if breathing has stopped. If the carotid pulse cannot be felt, external cardiac

massage should be commenced simultaneously. Resuscitation should continue until the patient is

breathing on his own or until medical aid arrives. Survival rates can be quite high if cardiopulmonary

resuscitation is started within 3 to 4 minutes of the injury being received.

Act At Once - Delay or Indecision May Be Fatal

1. Turn OFF the electrical source.

2. Commence artificial respiration immediately.

3. Treat for burns, bleeding and shock.

Removing a Casualty From Electrical Contact

LOW VOLTAGE - 0 to 240 volts (household use)

Switch off the current, if possible and time permits. If the switch cannot be located immediately and the

supply is through a flexible cord or cable, the current may be shut off by removing the plug or even

breaking the cable or wrenching it free. Never attempt to shut off current by cutting cord with a knife or

scissors.

If the current cannot be shut off, the greatest care is necessary in removing the casualty. Household rubber

gloves, rubber or plastic hose (if there is no water in them), a dry unpainted stick or a clean dry rope can be

used to free victim.

HIGH VOLTAGE - 240 volts and up (industrial machines and power lines)

Do not touch any person or equipment in contact with a wire.

Use a dry unpainted pole, clean dry rope, dry rubber or plastic water hose to separate the casualty from

the contact.

Keep as far away as possible.

Do not touch the casualty until the casualty is free.

J1000 Installation and Operation Manual Issue 4.0

Safety Information Page 5

SAFETY

Toxic Hazard Warning

There are devices used in this equipment containing beryllium oxide ceramic, which is non-hazardous

during normal device operation and under normal device failure conditions. These devices are

specifically identified in the equipment parts list(s).

DO NOT cut, crush or grind devices because the resulting dust may be HAZARDOUS IF INHALED.

Unserviceable devices should be disposed of as harmful waste.

J1000 Installation and Operation Manual Nov.01.07

Contents Page

1 GENERAL INFORMATION 1-1

1.1 INTRODUCTION 1-1

1.2 PURPOSE AND SCOPE OF MANUAL 1-1

1.3 PURPOSE OF EQUIPMENT 1-1

1.4 TEST EQUIPMENT 1-1

2 PREPARATION FOR USE AND INSTALLATION 2-1

2.1 PREPARATION FOR USE 2-1

2.1.1 Transmitter Weights and Dimensions 2-1

2.1.2 Transmitter Clearances 2-2

2.1.3 Cooling 2-2

2.1.4 Heating 2-2

2.1.5 Work Area 2-2

2.1.6 Ac Power Switch 2-2

2.1.7 Lightning Protection 2-2

2.1.8 Station Reference Ground 2-2

2.1.9 AC Power Source 2-2

2.1.9.1 Ac Wiring 2-2

2.1.10 Antenna Feed Cable 2-3

2.1.11 Antenna/RF Output Disconnect 2-3

2.1.12 Antenna Tower 2-3

2.1.13 External Control/Monitor Wiring 2-3

2.1.14 Electrical Power 2-3

2.1.14.1 Voltage Stability 2-3

2.1.14.2 Power Consumption 2-3

2.1.14.3 External Ac Switching 2-3

2.1.15 Antenna System 2-3

2.1.15.1 Antenna System – Digital Modulation 2-4

2.1.15.2 RF Feed Cable 2-4

2.1.15.3 Interface Protection Option 2-4

2.1.16 External RF Drive Source 2-4

2.1.16.1 Carrier Frequency Signal 2-4

2.1.16.2 10 MHz Frequency Reference 2-4

2.1.17 Internal/External RF Driver Source

Selection 2-5

2.1.18 Modulating Audio 2-5

2.1.18.1 Conventional AM Broadcast 2-5

2.1.18.2 Digital Operation (External Phase

Component) 2-5

2.1.18.3 Digital Operation HD Radio 2-5

2.1.19 Audio Pass Band Selection 2-5

2.1.20 External Interlocks 2-6

J1000 Installation and Operation Manual Nov.01.07

Contents Page

2.1.21 Remote Control Circuits 2-6

2.1.21.1 On/Off Control 2-7

2.1.21.2 Main Exciter Selection 2-7

2.1.21.3 Preset Power Level Selection 2-7

2.1.21.4 Power Level Adjust Select 2-7

2.1.21.5 System Reset 2-7

2.1.21.6 Auto/Manual 2-7

2.1.22 Other Remote Controls 2-9

2.1.22.1 PDM (RF) Inhibit Control 2-9

2.1.23 Serial Port 2-9

2.1.24 RF Performance Monitoring 2-9

2.1.24.1 RF Monitor Sample 2-9

2.1.24.2 Forward Power Level 2-9

2.1.24.3 Reflected Power Level 2-9

2.1.24.4 B+ Volts Sample 2-10

2.1.24.5 Total Dc Current Sample 2-10

2.1.25 Remote Alarm Indications 2-10

2.1.25.1 Exciter Fail Alarm 2-10

2.1.25.2 Battery Alarm 2-10

2.1.25.3 High VSWR Alarm 2-10

2.1.25.4 Shutdown/Cutback Alarm 2-10

2.1.25.5 Changeover Alarm 2-10

2.1.25.6 Modulation Protection Alarm 2-10

2.1.25.7 Pwr Module Fail Alarm 2-10

2.1.25.8 Low Ac Alarm 2-10

2.1.25.9 External Interlock Alarm 2-10

2.1.25.10 LVPS Fail Alarm 2-11

2.1.26 Remote Status Indications 2-11

2.1.26.1 Remote Control Status 2-11

2.1.26.2 RF On Status 2-11

2.1.26.3 Exciter B Status 2-11

2.1.26.4 Auto Status 2-11

2.1.26.5 RF Power Level Status 2-11

2.1.27 Parts Supplied by Nautel 2-11

2.1.27.1 Reject Load 2-11

2.1.28 Parts Not Supplied by Nautel 2-12

2.1.29 Test Equipment and Special Tools 2-12

2.1.30 Available Options 2-12

2.1.30.1 Standby Exciter Option 2-12

2.1.30.2 User-Supplied Cabinet Option 2-12

2.1.30.3 Nautel Cabinet Option 2-12

2.1.30.4 Spares Kit Option 2-12

2.1.30.5 Interface Protection Unit Option 2-12

2.1.30.6 Frequency Change Kit Option 2-12

J1000 Installation and Operation Manual Nov.01.07

Contents Page

2.2 INSTALLATION 2-13

2.2.1 Accepting the Shipment 2-13

2.2.2 Unpacking Instructions 2-13

2.2.3 Visual Inspection 2-13

2.2.4 RF Output Connector 2-17

2.2.5 Cabinet Installation 2-17

2.2.6 Installing RF Power Modules 2-17

2.2.7 Interconnect Wiring 2-19

2.2.8 Ac Power Switching Assembly 2-19

2.2.9 Installing Ac Power Wiring 2-19

2.2.10 RF Feed Cable 2-19

2.2.10.1 7/8-Inch RF Output Connection 2-20

2.2.11 Reject Load 2-21

2.2.12 Interface Protection Unit 2-21

2.2.12.1 RF Output Connector 2-21

2.2.12.2 Mounting 2-21

2.2.12.3 Ac Circuit Breaker and Fusing 2-21

2.2.12.4 Ground Stud 2-22

2.2.12.5 Remote Control/Monitor Wiring 2-22

2.2.13 Station Reference Ground 2-22

2.2.14 Determining Control/Monitoring

Requirements 2-22

2.2.15 External Control Wiring 2-22

2.2.16 Internal/External RF Drive Source 2-22

2.3 COMMISSIONING PROCEDURES 2-23

2.3.1 Precautions 2-23

2.3.2 Turn-On Prerequisites 2-23

2.3.3 Initial Turn-On 2-23

2.3.4 Placing J1000 On-Air 2-24

3 OPERATING INSTRUCTIONS 3-1

3.1 INTRODUCTION 3-1

3.1.1 Precautions 3-1

3.2 EMERGENCY SHUTDOWN 3-1

3.2.1 Turn Off RF Output 3-1

3.2.2 Complete Shutdown 3-1

3.3 EXTERNAL SAFETY INTERLOCK 3-1

3.4 ELECTROSTATIC DISCHARGE PROTECTION 3-2

3.4.1 Discharging of Personnel 3-2

3.4.2 Handling/Storage 3-2

3.4.3 Tools/Test Equipment 3-2

3.4.4 Stress Current Protection 3-2

J1000 Installation and Operation Manual Nov.01.07

Contents Page

3.5 CONTROLS AND INDICATORS 3-2

3.5.1 Exciter Front Panel 3-2

3.5.2 Remote Interface PWB 3-3

3.5.3 RF Synthesizer PWB 3-3

3.5.4 Miscellaneous Exciter 3-3

3.5.5 RF Power Module 3-3

3.6 DIAGNOSTIC DISPLAY 3-13

3.6.1 Pushbutton Switches 3-13

3.6.2 Main Screen 3-13

3.6.2.1 Transmitter Status Bar 3-13

3.6.3 Viewing Faults 3-15

3.6.4 Adjusting RF Output Power 3-15

3.6.5 Exciter Control 3-16

3.6.6 Viewing Events Log 3-16

3.6.7 Scheduling Pre-Set Power Levels 3-17

3.6.8 Setting Real Time Clock 3-17

3.6.9 Changing Factory Calibrated Setting 3-18

3.6.9.1 Calibrate Meters 3-18

3.6.9.2 Set Thresholds 3-19

3.6.9.3 Maximum Allowable Output Gain 3-19

3.6.9.4 Use Factory Settings 3-19

3.6.10 Viewing Software Version 3-20

3.6.11 NxLink Configuration 3-20

3.6.12 Selecting Metered Parameters 3-20

3.6.13 Module Check 3-20

3.6.14 Battery Status 3-20

4 TESTING AND ADJUSTMENT 4-1

4.1 INTRODUCTION 4-1

4.2 OPERATING PRECAUTIONS 4-1

4.3 FUNCTIONAL TESTS 4-1

4.3.1 General 4-1

4.3.2 Test Equipment Required 4-3

4.3.3 Test Prerequisites 4-3

4.3.4 Initial Turn-On 4-3

4.3.5 Standard Adjustments 4-4

4.3.5.1 Modulation Checks 4-4

4.3.6 Non-Standard Adjustments 4-5

4.3.6.1 RF Drive Symmetry 4-5

4.3.6.2 Exciter Gain (Dual Exciter J000s Only) 4-5

4.3.6.3 Modulation Peak Limiting 4-6

4.3.6.4 Audio Dump 4-6

4.3.6.5 Dc Current Cutback 4-7

J1000 Installation and Operation Manual Nov.01.07

Contents Page

5 SYSTEM LEVEL TROUBLESHOOTING 5-1

5.1 GENERAL 5-1

5.2 SCHEDULED MAINTENANCE 5-1

5.2.1 Cleaning the J1000 5-1

5.2.2 Checking Hardware 5-1

5.2.3 Battery Replacement 5-1

5.3 CORRECTIVE MAINTENANCE 5-2

5.3.1 On-Air Troubleshooting 5-2

5.3.1.1 Remote Troubleshooting 5-2

5.3.1.2 Local Troubleshooting 5-2

5.3.2 Off-Air Troubleshooting 5-2

5.4 ELECTROSTATIC PROTECTION 5-3

5.4.1 Discharging of Personnel 5-3

5.4.2 Handling/Storage 5-3

5.4.3 Tools/Test Equipment 5-3

5.4.4 Stress Current Protection 5-3

5.5 TROUBLESHOOTING FRONT PANEL

ALARMS 5-3

5.6 OPERATING WITH DEFECTIVE OR MISSING

RF POWER MODULE 5-5

5.7 RF POWER MODULE FAULT ISOLATION 5-6

5.8 REPLACING AN RF POWER MODULE 5-6

5.8.1 RF Power Module Removal 5-6

5.8.2 RF Power Module Installation 5-7

5.9 EXCITER/CONTROL ASSEMBLY PWB

REPLACEMENT 5-7

5.9.1 Exciter Interface PWB and Interconnecting

PWB Replacement 5-8

5.9.1.1 RF Synthesizer PWB Removal/Replacement 5-8

5.9.1.2 Interphase PDM Driver PWB Removal/

Replacement 5-9

5.9.1.3 Exciter Interface PWB Removal/Replacement 5-9

5.9.2 Remote Interface PWB Replacement 5-9

List of Tables

1-1 Recommended Site Test Equipment 1-2

2-1 Transmitter Weights and Dimensions 2-1

2-2 Audio Filter Switch Setting 2-5

3-1 Exciter Panel – System Diagram Controls and Indicators 3-5

3-2 Exciter Panel – Control Section Controls and Indicators 3-7

3-3 Remote Interface PWB Controls and Indicators 3-9

3-4 RF Synthesizer PWB Controls and Indicators 3-11

3-5 Miscellaneous Exciter Controls and Indicators 3-12

3-6 RF Power Modules Controls and Indicators 3-12

J1000 Installation and Operation Manual Nov.01.07

Contents Page

List of Figures/Drawings

1-1 J1000 – 1000 Watt AM Broadcast Transmitter 1-1

2-1 Single Ended Input Selected 2-6

2-2 Differential Input Selected 2-7

2-3 J1000 External Input/Output Interface 2-8

2-4 Dimensional Information - J1000 Transmitter without Cabinet

and Front Grille 2-14

2-5 Dimensional Information - J1000Transmitter with Nautel

Cabinet 2-15

2-6 Recommended Installation for J1000 Transmitter 2-16

2-7 Assembly/Installation Considerations for

User Supplied Cabinet 2-18

2-8 Interface Protection Assembly 2-20

2-9 RF Power Module Current versus RF Output Power 2-24

2-10 Buffered Dc Current versus RF Output Power 2-24

3-1 J1000 Exciter Front Panel (Primary User Interface) 3-3

3-2 J1000 Exciter Front Panel - System Diagram Section 3-4

3-3 J1000 Exciter Front Panel - Control Section 3-6

3-4 Assembly Detail - Part of Remote Interface PWB (NAPI85/01) 3-8

3-5 Assembly Detail - RF Synthesizer PWB (NAPE70C) 3-10

3-6 Diagnostic Display - Main Screen 3-13

3-7 Diagnostic Display – Main Menu Screen 3-13

3-8 Flow Diagram – Diagnostic Display Menu Functions 3-14

4-1 Exciter/Control Assembly A1 4-2

4-2 RF Power Module (Left-Hand Side View) 4-6

4-3 RF Output with Positive Peak Limiting 4-7

4-4 Modulated RF Output with Audio Dump Distortion

Adjustment 4-7

5-1 Partial Rear View of J1000 (showing RF Power Modules) 5-5

Appendices

A Site Evaluation Checklist

J1000 Installation and Operation Manual Nov.01.07

Control Record

Issue Date Reason

4.0 01 November 2007 Release 4 of J1000 (NARA40C)

J1000 Installation and Operation Manual Page 1-1

Section 1 General Information Issue 4.0

J1000

INSTALLATION AND OPERATION MANUAL

Section 1 GENERAL INFORMATION

1.1 INTRODUCTION

The J1000 is a medium wave, 1,000 watt

AM broadcast transmitter. It is entirely solid

state and is HD Radio™ and DRM

compatible. The transmitter is shown in

Figure 1-1. Two completely independent and

redundant signal chains from the LVPS

output to the RF output filter reduce the

amount of time the transmitter is off-air. A

standby exciter section is available which

duplicates the exciter stage’s RF synthesizer

PWB and interphase PDM driver PWB. The

transmitter operates at one pre-set

frequency in the AM broadcast band into a

nominal 50-ohm, unbalanced transmission

line. Typically, the transmitter will operate

continuously at 125% positive peak program

modulation at 1,100 W.

1.2 PURPOSE AND SCOPE OF

MANUAL

This Installation and Operation Manual

provides information required to install and

operate the J1000 transmitter. In addition,

sufficient information is provided to conduct

system level troubleshooting at a module

level. The Repair Manual, also provided with

the transmitter, provides in-depth,

component level maintenance information.

1.3 PURPOSE OF EQUIPMENT

The J1000 transmitter is intended for use in

conventional AM broadcasting stations.

Remote control capabilities are incorporated

to allow unattended operation.

1.4 TEST EQUIPMENT

Test equipment and special tools required to

operate and maintain the transmitter are

listed in Table 1-1.

Figure 1-1 J1000 Transmitter

Page 1-2 J1000 Installation and Operation Manual

Issue 4.0 Section 1 General Information

Table 1-1: Recommended Site Test Equipment

EQUIPMENT PART/MODEL NUMBER

OR TYPE (EQUIVALENT

MAY BE USED)

APPLICATION

Dummy load

Digital multimeter

50 Ω, 2,000 W (minimum),

VSWR 1.1

3-1/2 digit, ac and dc volts

(10 MΩ input), ohms and

amps, ± 0.5% accuracy,

Beckman 3010

‘Off-air’ testing

Testing and maintenance

Frequency counter 5 ppm up to 10 MHz

Fluke model 1900A Measure carrier frequency

Oscilloscope Tektronix model T922 Testing and maintenance

Modulation monitor 50 Ω input impedance,

-100% to +140% mod depth

TFT model 375

To set up audio level

RF signal/function generator 540 kHz to 1,700 kHz

Tektronix model CFG253 Testing and maintenance

Audio signal generator 10 Hz to 10 MHz, 600 ohms,

0 to +15 dBm

Hewlett Packard model 651B

Simulates modulating audio

during testing and

maintenance

Distortion analyzer 20 Hz to 20 kHz

Marconi model TF231 Measures audio distortion

during testing and

maintenance

Dc power supply (variable) 0 – 30 V, 1A Testing and maintenance

Dc power supply (fixed) 24 V, 1 A Testing and maintenance

Torque wrench Capable of providing five

inch-pounds (0.665 Newton-

Meters) of torque.

Installing power MOSFETs

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Nautel J1000 Installation guide

Nautel J1000 Installation guide

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