Nautel XL12 Owner's manual

e-mail: [email protected]
web: www.nautel.com
Nautel Maine Inc. Nautel Limited
201 Target Industrial Circle, Hackett’s Cove, RR #1 Tantallon,
Bangor, Maine USA 04401 Nova Scotia Canada B0J 3J0
Phone: [phone] Phone: [phone]
Fax: [phone] Fax: [phone]
ISO 9002 REGISTERED ISO 9001 REGISTERED
© Copyright 2002 NAUTEL. All rights reserved
TECHNICAL INSTRUCTIONS
XL12
AM BROACAST TRANSMITTER
12 000 WATT
(SIX PRESET POWER LEVELS)
Original Issue...................01 January 2002

12 000 WATT AM BROADCAST TRANSMITTER
XL12
Effective Pages (Page 1)
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12 000 WATT FM BROADCAST TRANSMITTER
XL12
Safety (Page 1)
01 January 2002
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:
(a) Loosen casualty’s clothing.
(b) 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.
1
2
3
4
5
6

12 000 WATT FM BROADCAST TRANSMITTER
XL12
Safety (Page 2)
01 January 2002
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 which adheres to the skin or break 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 severe bleeding of wound, 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.

12 000 WATT FM BROADCAST TRANSMITTER
XL12
Safety (Page 3)
01 January 2002
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, it can 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 which 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 milliamps) 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, if breathing has stopped, artificial respiration should
be commenced immediately. If the carotid pulse cannot be felt, external cardiac massage should be commenced
simultaneously. Resuscitation should be continued until the patient is breathing on his own or until medical aid
arrives. Survival rates can be quite high if cardio-pulmonary 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 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 he is free.

12 000 WATT AM BROADCAST TRANSMITTER
XL12
Warranty (Page 1)
01 January 2002
WARRANTY
Nautel Limited/Nautel Maine 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" shall be deemed to have occurred when the part has become defective, or does not have
the characteristics required for the specified equipment performance:
(a) When the equipment is operated within the design parameters, and
(b) When the equipment is installed and adjusted according to Nautel's prescribed procedures as stated in
the instruction manual.
2. Nautel shall provide replacements for all "Parts" at no cost to the Customer when they become defective
during the warranty period, and upon the return of the defective part.
3. In the event that a "Part" fails during the warranty period and causes damage to a sub-assembly that cannot
be readily repaired in the field, the entire sub-assembly so damaged may be returned to Nautel for repair.
The repairs will be made without charge to the Customer.
4. Where warranty replacements or repair 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 repair, which are provided under items 2 or 3, shall be guaranteed for a
period of ninety days from date of shipment or until the end of the original warranty period, whichever
occurs later.
6. Nautel will not assume responsibility for any charges incurred by other than Nautel employees.
7. Nautel shall have the privilege of investigating whether failures have been caused by factors beyond its
control.
8. Nautel shall in no event be liable for any consequential damages arising from the use of this equipment.
9. When requesting a warranty repair/replacement, please provide complete and accurate information.
Observe the instructions regarding 'Equipment Being Returned to Nautel' on page two of this warranty and
provide the information requested.
10. When ordering spare/replacement parts; please provide complete and accurate information. Refer to the
parts list of this manual for ordering information. Provide as much of the information requested for
'Equipment Being Returned to Nautel' on page two of this warranty as is practical. The information
identified by an asterisk is the minimum required.
ON-LINE PART QUOTES
Nautel provides an on-line website service (www.nautel.com/in-service.html) where requests for part quotes
may be submitted. Requests will normally be responded to within one working day.

12 000 WATT AM BROADCAST TRANSMITTER
XL12
Warranty (Page 2)
01 January 2002
FACTORY SUPPORT
TECHNICAL ASSISTANCE
Nautel's field service department provides telephone technical assistance on a 24 hour, seven days a week basis.
Requests by other media (facsimile or e-mail) will be responded to the next working day if received after Nautel's
normal working hours. Contact the appropriate field service centre from the following:
U.S.A. customers use: Nautel Maine Incorporated Telephone [phone] (24 hours)
201 Target Industrial CircleFacsimile 207-947-3693
Bangor, Maine 04401
All other customers use: Nautel Limited Telephone [phone] (24 hours)
Hackett's Cove, RR#1 Tantallon Facsimile 902-823-3183
Nova Scotia, Canada E-Mail [email protected]
B0J 3J0 Web www.nautel.com
MODULE EXCHANGE SERVICE
In order to provide Nautel customers with a 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
All equipment being returned to Nautel and all requests for repairs or replacements should be marked 'field return'
and addressed to the appropriate Nautel facility.
Complete and accurate information regarding the equipment being returned will ensure prompt attention and will
expedite the dispatch of replacements. 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

12 000 WATT AM BROADCAST TRANSMITTER
XL12
Contents (Page 1)
01 January 2002
TABLE OF CONTENTS
Section Page
1GENERAL INFORMATION
1.1 INTRODUCTION ...................................................................................................... 1-1
1.2 FACTORY SUPPORT............................................................................................... 1-1
1.3 PURPOSE AND SCOPE OF MANUAL ...................................................................... 1-1
1.3.1 FAMILY TREE .........................................................................................................1-1
1.4 PURPOSE OF EQUIPMENT ..................................................................................... 1-1
1.5 MECHANICAL DESCRIPTION .................................................................................. 1-1
1.6 TECHNICAL SUMMARY .......................................................................................... 1-1
1.7 SPECIAL TOOLS AND TEST EQUIPMENT ............................................................... 1-1
1.8 GLOSSARY OF TERMS .......................................................................................... 1-1
2INSTALLATION
2.1 PLANNING AND SITE PREPARATION...................................................................... 2-1
2.1.1 TRANSMITTER ROOM REQUIREMENTS...................................................................2-1
2.1.1.1 Transmitter Dimensions ......................................................................................2-1
2.1.1.2 Transmitter Clearances .......................................................................................2-1
2.1.1.3 Air Flushing .......................................................................................................2-1
2.1.1.4 Cooling..............................................................................................................2-1
2.1.1.5 Heating..............................................................................................................2-1
2.1.1.6 Work Area.........................................................................................................2-1
2.1.2 LIGHTNING PROTECTION ........................................................................................2-1
2.1.2.1 Station Reference Ground ...................................................................................2-2
2.1.2.2 AC Power Source...............................................................................................2-2
2.1.2.3 Antenna Feed Cable...........................................................................................2-2
2.1.2.4 Antenna/RF Output Disconnect ...........................................................................2-2
2.1.2.5 Antenna Tower...................................................................................................2-2
2.1.2.6 External Control/Monitor Wiring ...........................................................................2-2
2.1.3 ELECTRICAL POWER..............................................................................................2-2
2.1.3.1 Nominal Voltage.................................................................................................2-2
2.1.3.2 Voltage Stability.................................................................................................2-2
2.1.3.3 Power Consumption............................................................................................2-3
2.1.3.4 External AC Switching........................................................................................2-3
2.1.4 ANTENNA SYSTEM.................................................................................................2-3
2.1.4.1 RF Feed Cable...................................................................................................2-3
2.1.5 EXTERNAL RF DRIVE SOURCE ...............................................................................2-3
2.1.6 MODULATING AUDIO...............................................................................................2-3
2.1.6.1 Both Exciters Monaural (Internal or External RF Drive)...........................................2-3
2.1.6.2 Both Exciters AM Stereo (External RF Drive)........................................................2-4
2.1.6.3 One Exciter AM Stereo (External RF Drive)/One Exciter Monaural..........................2-4
2.1.6.4 Exciter 'A' AM Stereo (Optional C-QUAM AM Stereo Exciter as RF Drive Source.....2-4
2.1.7 SAFETY INTERLOCKS.............................................................................................2-4
2.1.7.1 External Electrical Interlock.................................................................................2-4
2.1.7.2 Internal Electrical Interlock ..................................................................................2-5
2.1.7.3 Mechanical Safety Interlock.................................................................................2-5
2.1.8 REMOTE CONTROL CIRCUITS .................................................................................2-5
2.1.8.1 On/Off Control....................................................................................................2-6
2.1.8.2 Main Exciter Selection........................................................................................2-6
2.1.8.3 Preset Power Level Selection ..............................................................................2-6

12 000 WATT AM BROADCAST TRANSMITTER
XL12
Contents (Page 2)
01 January 2002
TABLE OF CONTENTS (Continued)
Section Page
2INSTALLATION (Continued)
2.1.8.4 Power Level Adjust Select...................................................................................2-6
2.1.8.5 System Reset....................................................................................................2-7
2.1.8.6 Alarm Recall......................................................................................................2-7
2.1.9 OTHER REMOTE CONTROLS ..................................................................................2-7
2.1.9.1 External PDM (RF) Inhibit Control ........................................................................2-7
2.1.10 RF PERFORMANCE MONITORING...........................................................................2-7
2.1.10.1 RF Monitor Sample.............................................................................................2-7
2.1.10.2 Forward Power Level...........................................................................................2-7
2.1.10.3 Reflected Power Level.........................................................................................2-7
2.1.10.4 Power Amplifier Volts..........................................................................................2-7
2.1.11 REMOTE ALARM INDICATIONS................................................................................2-8
2.1.11.1 RF Stress Current Alarm.....................................................................................2-8
2.1.11.2 Filter Over Temp Alarm .......................................................................................2-8
2.1.11.3 High Reflected Power Alarm................................................................................2-8
2.1.11.4 RF Power Cutback Alarm....................................................................................2-8
2.1.11.5 RF Inhibit Alarm .................................................................................................2-8
2.1.11.6 Standby Exciter Alarm........................................................................................2-8
2.1.11.7 Modulation Protection Alarm................................................................................2-8
2.1.11.8 Power Module Fault Alarm ..................................................................................2-8
2.1.11.9 B+ Power Supply Fault Alarm..............................................................................2-9
2.1.11.10 AC Fail Alarm ....................................................................................................2-9
2.1.11.11 Power Supply Over Temp Alarm...........................................................................2-9
2.1.11.12 Battery Low Alarm..............................................................................................2-9
2.1.11.13 External Interlock Alarm......................................................................................2-9
2.1.11.14 Internal Interlock Alarm .......................................................................................2-9
2.1.11.15 RF Power Shutback Alarm..................................................................................2-9
2.1.11.16 RF Drive B+ Fail Alarm .......................................................................................2-9
2.1.11.17 PDM Failure Alarm.............................................................................................2-9
2.1.11.18 RF Drive Fail Alarm.............................................................................................2-9
2.1.11.19 Low DC Volts Fail Alarm.....................................................................................2-9
2.1.12 REMOTE STATUS INDICATIONS ............................................................................ 2-10
2.1.12.1 Remote Control Status...................................................................................... 2-10
2.1.12.2 RF Pwr On Status ............................................................................................ 2-10
2.1.12.3 Exciter B Status............................................................................................... 2-10
2.1.12.4 RF Power Level Status...................................................................................... 2-10
2.1.13 PARTS SUPPLIED BY NAUTEL.............................................................................. 2-10
2.1.13.1 Ancillary Parts ................................................................................................. 2-11
2.1.14 PARTS REQUIRED BUT NOT SUPPLIED BY NAUTEL............................................. 2-11
2.1.14.1 Surge Protector Panel....................................................................................... 2-11
2.1.15 TEST EQUIPMENT AND SPECIAL TOOLS .............................................................. 2-11
2.2 NON-TECHNICAL PRE-COMMISSIONING............................................................... 2-12
2.2.1 ACCEPTANCE OF SHIPMENT................................................................................ 2-12
2.2.2 UNPACKING INSTRUCTIONS ................................................................................. 2-12
2.2.3 CABINET PRE-POSITIONING.................................................................................. 2-12
2.2.4 DISASSEMBLY REQUIRED.................................................................................... 2-13
2.2.5 VISUAL INSPECTION............................................................................................. 2-13
2.2.6 REASSEMBLY ...................................................................................................... 2-14

12 000 WATT AM BROADCAST TRANSMITTER
XL12
Contents (Page 3)
01 January 2002
TABLE OF CONTENTS (Continued)
Section Page
2INSTALLATION (Continued)
2.2.6.1 Installation of Reference Ground Stud................................................................. 2-14
2.2.6.2 Installation of Fan Trays.................................................................................... 2-14
2.2.6.3 Installation of RF Power Modules ....................................................................... 2-14
2.2.6.4 Installation of Main Power Transformer................................................................ 2-15
2.2.6.5 Connection of Power Transformer (A23A1) Wiring................................................ 2-15
2.2.7 AC POWER CONNECTION..................................................................................... 2-16
2.2.7.1 Installation of Circuit Breaker Enclosure.............................................................. 2-16
2.2.7.2 Installation of AC Power Wiring (Service Entrance to Enclosure)........................... 2-16
2.2.7.3 Installation of AC Power Wiring (Enclosure to Transmitter) ................................... 2-16
2.2.8 INSTALLATION OF RF FEED CABLE ...................................................................... 2-17
2.2.9 INSTALLATION OF EXTERNAL WIRING................................................................... 2-17
2.2.9.1 External Control Wiring..................................................................................... 2-18
2.2.9.2 RF Performance Monitoring Wiring..................................................................... 2-18
2.2.9.3 Alarm/Status Monitor Wiring.............................................................................. 2-18
2.2.9.4 Audio Wiring.................................................................................................... 2-19
2.2.9.5 External RF Drive Wiring................................................................................... 2-19
2.2.10 REASSEMBLY ...................................................................................................... 2-19
2.2.11 REFERENCE GROUND INTERCONNECTION .......................................................... 2-19
2.3 TECHNICAL PRE-COMMISSIONING....................................................................... 2-21
2.3.1 AC POWER SOURCE VARIABLES......................................................................... 2-21
2.3.1.1 Main Power Transformer Primary Tap Selection................................................... 2-21
2.3.1.2 Low Volts Pwr Supply Transformer Primary Tap Selection.................................... 2-21
2.3.2 EXCITER RF DRIVE PWB OPTIONS ....................................................................... 2-22
2.3.2.1 Exciter A's RF Drive PWB................................................................................. 2-22
2.3.2.2 Exciter B's RF Drive PWB................................................................................. 2-22
2.3.3 INTERNAL/EXTERNAL RF DRIVE SOURCE............................................................. 2-22
2.3.4 FREQUENCY DEPENDENT VARIABLES ................................................................ 2-22
2.3.5 AUDIO PASS BAND SELECTION............................................................................ 2-23
2.3.6 AUDIO CHOICES................................................................................................... 2-23
2.3.7 REMOTE CONTROL CHOICES............................................................................... 2-23
2.3.7.1 Differential Inputs.............................................................................................. 2-23
2.3.7.2 Single Ended Inputs.......................................................................................... 2-23
2.3.8 ALARM/STATUS OUTPUT CHOICES....................................................................... 2-24
2.3.8.1 Logic False - Open Collector ............................................................................. 2-24
2.3.8.2 Logic False - +5VDC ........................................................................................ 2-24
2.3.9 ALARM DISPLAY OPTIONS ................................................................................... 2-25
2.3.9.1 Continuous Alarm Display ................................................................................. 2-25
2.3.9.2 Flashing Alarm Display ..................................................................................... 2-25
2.4 COMMISSIONING PROCEDURES .......................................................................... 2-26
2.4.1 PRECAUTIONS TO BE OBSERVED........................................................................ 2-26
2.4.2 TURN ON PREREQUISITES ................................................................................... 2-26
2.4.3 INITIAL TURN-ON................................................................................................... 2-27
2.4.4 RF DRIVE CHECKS............................................................................................... 2-29
2.4.4.1 RF Drive Frequency.......................................................................................... 2-29
2.4.4.2 RF Drive Symmetry .......................................................................................... 2-29
2.4.4.3 RF Drive Level.................................................................................................. 2-30
2.4.5 CHECK OF RF POWER STAGES........................................................................... 2-30

12 000 WATT AM BROADCAST TRANSMITTER
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Contents (Page 4)
01 January 2002
TABLE OF CONTENTS (Continued)
Section
2INSTALLATION (Continued)
2.4.5.1 RF Power Checks ............................................................................................ 2-30
2.4.5.2 Setting Preset RF Power Levels......................................................................... 2-31
2.4.5.3 Setting RF Monitoring Voltages ......................................................................... 2-31
2.4.6 MODULATION CHECKS......................................................................................... 2-33
2.4.6.1 Modulation Envelope (Monaural Output).............................................................. 2-33
2.4.6.2 Modulation Checks (AM Stereo Output).............................................................. 2-34
2.4.6.3 Modulation Peak Limiting.................................................................................. 2-34
2.4.7 PLACING TRANSMITTER ON-AIR ........................................................................... 2-35
2.4.8 ON-AIR TESTS ...................................................................................................... 2-35
2.5 SPECIAL ADJUSTMENT PROCEDURES................................................................. 2-36
2.5.1 INCIDENTAL PHASE MODULATION (External AM Stereo Drive) COMPENSATION ..... 2-36
2.5.2 RF CURRENT LEVEL............................................................................................. 2-37
3CONTROLS AND INDICATORS
3.1 GENERAL ............................................................................................................... 3-1
3.2 CONTROL/MONITOR PANEL CONTROLS AND INDICATORS ................................... 3-1
3.3 EXCITER PANEL CONTROLS AND INDICATORS ..................................................... 3-1
3.4 RF DRIVE TUNING PWB CONTROLS....................................................................... 3-1
3.5 RF DRIVE STAGE CONTROLS AND INDICATORS .................................................... 3-1
3.6 AC/DC POWER SUPPLY CONTROLS AND INDICATORS.......................................... 3-1
3.7 8-INPUT RF COMBINER/FILTER ASSEMBLY............................................................ 3-2
3.8 FORWARD/REFLECTED POWER PROBE ASSEMBLY.............................................. 3-2
4OPERATING INSTRUCTIONS
4.1 GENERAL ............................................................................................................... 4-1
4.1.1 PRECAUTIONS TO BE OBSERVED..........................................................................4-1
4.2 CONTROLS AND INDICATORS ................................................................................ 4-1
4.3 EMERGENCY SHUTDOWN PROCEDURE.................................................................. 4-1
4.3.1 TURN OFF RF OUTPUT............................................................................................4-1
4.3.2 COMPLETE SHUTDOWN.........................................................................................4-1
4.4 IEC215 ENTRY KIT OPTION..................................................................................... 4-1
4.5 ELECTROSTATIC PROTECTION.............................................................................. 4-2
4.5.1 PERSONAL DISCHARGING......................................................................................4-2
4.5.2 HANDLING/STORAGE..............................................................................................4-2
4.5.3 TOOLS/TEST EQUIPMENT.......................................................................................4-2
4.5.4 STRESS CURRENT PROTECTION............................................................................4-2
4.6 PRE-STARTUP CHECKS.......................................................................................... 4-2
4.7 READING METERS .................................................................................................. 4-2
4.7.1 READING RF POWER METER.................................................................................4-2
4.7.2 READING DC VOLTS METER...................................................................................4-3
4.8 LOCAL/REMOTE CONTROL .................................................................................... 4-3
4.8.1 LOCAL CONTROL....................................................................................................4-3
4.8.2 REMOTE CONTROL.................................................................................................4-3
4.9 OPERATIONAL CONTROLS .................................................................................... 4-4
4.9.1 ACTIVE EXCITER SELECTION..................................................................................4-4
4.9.1.1 Exciter 'A' Active ................................................................................................4-4

12 000 WATT AM BROADCAST TRANSMITTER
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Contents (Page 5)
01 January 2002
TABLE OF CONTENTS (Continued)
Section
4OPERATING INSTRUCTION (Continued)
4.9.1.2 Exciter 'B' Active ................................................................................................4-4
4.9.1.3 Exciter Assemblies ............................................................................................4-4
4.9.2 PRESET RF POWER SELECTION............................................................................4-4
4.9.3 RF POWER TRIM ....................................................................................................4-5
4.9.3.1 Increase RF Power.............................................................................................4-5
4.9.3.2 Decrease RF Power............................................................................................4-5
4.9.4 RF ON/OFF SELECTION..........................................................................................4-5
4.9.4.1 RF On Selection.................................................................................................4-5
4.9.4.2 RF Off Selection.................................................................................................4-5
4.9.5 LOCAL/REMOTE CONTROL SELECTION..................................................................4-5
4.9.6 ADJUST AUDIO LEVEL............................................................................................4-5
4.10 STATUS DISPLAYS ................................................................................................ 4-5
4.10.1 DISPLAY COLOUR ..................................................................................................4-5
4.10.2 DISPLAY TYPE .......................................................................................................4-6
4.10.2.1 Latching Alarm Display .......................................................................................4-6
4.10.2.2 Non-Latching Alarm Displays...............................................................................4-6
4.11 TESTING DISPLAYS ............................................................................................... 4-7
4.12 LATCHING PROTECTION CIRCUITS........................................................................ 4-7
4.12.1 B+ POWER SUPPLY OVER TEMP...........................................................................4-7
4.12.2 PDM FAILURE.........................................................................................................4-7
4.12.3 RF POWER MODULE FAILURES .............................................................................4-7
4.12.3.1 RF Drive Failure Detectors...................................................................................4-7
4.12.3.2 Over Temperature Detector..................................................................................4-8
4.12.3.3 Modulator Failure Detectors.................................................................................4-8
4.12.4 RESETTING LATCHED PROTECTION CIRCUITS........................................................4-8
4.13 TURN-ON EXPECTATIONS ...................................................................................... 4-8
5SYSTEM LEVEL TROUBLE SHOOTING
5.1 GENERAL ............................................................................................................... 5-1
5.2 SCHEDULED MAINTENANCE................................................................................... 5-1
5.3 CORRECTIVE MAINTENANCE.................................................................................. 5-1
5.3.1 ON-AIR TROUBLE SHOOTING..................................................................................5-2
5.3.1.1 Remote Trouble Shooting....................................................................................5-2
5.3.1.2 Local Trouble Shooting........................................................................................5-2
5.3.2 OFF-AIR TROUBLE SHOOTING................................................................................5-2
5.4 ELECTROSTATIC PROTECTION.............................................................................. 5-2
5.5 TROUBLE SHOOTING FRONT PANEL ALARMS....................................................... 5-2
5.5.1 RF POWER MODULES ALARM................................................................................5-3
5.5.1.1 RF Power Module Fault Validation .......................................................................5-3
5.5.1.2 RF Power Module Trouble Shooting......................................................................5-3
5.5.2 EXTERNAL INTERLOCK ALARM...............................................................................5-3
5.5.3 INTERNAL INTERLOCK ALARM................................................................................5-3
5.5.4 B+ POWER SUPPLY - AC FAIL ALARM ...................................................................5-4
5.5.5 B+ POWER SUPPLY - OVER VOLTAGE ALARM ......................................................5-4
5.5.6 B+ POWER SUPPLY - UNDER VOLTAGE ALARM ....................................................5-4
5.5.7 B+ POWER SUPPLY - TEMPERATURE ALARM .......................................................5-4

12 000 WATT AM BROADCAST TRANSMITTER
XL12
Contents (Page 6)
01 January 2002
TABLE OF CONTENTS (Continued)
Section
5SYSTEM LEVEL TROUBLE SHOOTING (Continued)
5.5.8 LOW VOLTAGE POWER SUPPLY - RF DRIVE AMP ALARM.....................................5-5
5.5.9 LOW VOLTAGE POWER SUPPLY - BATTERY LOW ALARM.....................................5-5
5.5.10 LOW VOLTAGE POWER SUPPLY - REGULATED VOLTAGE ALARM ........................5-5
5.5.11 EXCITER - RF DRIVE ALARM ...................................................................................5-6
5.5.12 EXCITER - INTERPHASE PDM DRIVE ALARM...........................................................5-7
5.5.13 EXCITER - MODULATOR PROTECTION ALARM ........................................................5-8
5.5.14 EXCITER - EXTERNAL PDM INHIBIT ALARM..............................................................5-9
5.5.15 EXCITER - STANDBY ALARM...................................................................................5-9
5.5.16 RF POWER CUTBACK ALARM ................................................................................5-9
5.5.17 RF POWER SHUTBACK ALARM ............................................................................ 5-10
5.5.18 OUTPUT NETWORKS - RF CURRENT ALARM ........................................................ 5-10
5.5.19 OUTPUT NETWORKS - VSWR ALARM................................................................... 5-10
5.5.20 OUTPUT NETWORKS - TEMPERATURE................................................................. 5-11
5.5.21 RF DRIVE TUNING PROCEDURE ........................................................................... 5-11
5.5.21.1 RF Drive Series Tuning...................................................................................... 5-11
5.5.21.2 RF Power Module Tuning .................................................................................. 5-12
5.5.21.3 RF Drive Level.................................................................................................. 5-12
5.6 REPLACEMENT OF RF POWER MODULE.............................................................. 5-13
5.6.1 RF POWER MODULE REMOVAL........................................................................... 5-13
5.6.2 RF POWER MODULE INSTALLATION..................................................................... 5-13
5.7 PWB REPLACEMENT/ADJUSTMENT ..................................................................... 5-14
5.7.1 SYSTEM CONTROL PWB REPLACEMENT............................................................. 5-14
5.7.2 DISTRIBUTION PWB REPLACEMENT/ADJUSTMENT............................................... 5-15
5.7.3 EXCITER INTERFACE PWB REPLACEMENT.......................................................... 5-15
5.7.4 DC POWER SUPPLY PWB REPLACEMENT........................................................... 5-15
5.7.5 RF DRIVE PWB REPLACEMENT............................................................................ 5-16
5.7.6 INTERPHASE PDM DRIVER PWB REPLACEMENT................................................. 5-16
5.7.7 POWER SUPPLY MONITOR PWB REPLACEMENT................................................ 5-16
6THEORY OF OPERATION
6.1 GENERAL ............................................................................................................... 6-1
6.2 SYSTEM OVERVIEW ............................................................................................... 6-1
6.3 EXCITER STAGE..................................................................................................... 6-1
6.3.1 EXCITER INTERFACE PWB .....................................................................................6-1
6.3.1.1 Exciter Selection................................................................................................6-1
6.3.1.2 Audio Source.....................................................................................................6-2
6.3.1.3 ƒPDM Frequency Monitor....................................................................................6-2
6.3.1.4 IPM Correction...................................................................................................6-2
6.3.1.5 PDM Monitor......................................................................................................6-2
6.3.1.6 Low Voltage Supply Detector...............................................................................6-3
6.3.2 RF DRIVE SOURCE.................................................................................................6-3
6.3.2.1 RF Drive PWB....................................................................................................6-3
6.3.2.2 Frequency Synthesizer PWB ..............................................................................6-3
6.3.2.3 C-QUAM1AM Stereo Exciter PWB......................................................................6-3
6.3.3 INTERPHASE PDM DRIVE PWB ..............................................................................6-3
6.3.4 DC POWER SUPPLY PWBS....................................................................................6-3

12 000 WATT AM BROADCAST TRANSMITTER
XL12
Contents (Page 7)
01 January 2002
TABLE OF CONTENTS (Continued)
Section
6THEORY OF OPERATION (Continued)
6.4 RF DRIVE STAGE.................................................................................................... 6-4
6.4.1 REGULATED POWER SUPPLIES.............................................................................6-3
6.4.2 RF DRIVE AMPLIFIER..............................................................................................6-3
6.4.3 RF DRIVE TUNING...................................................................................................6-4
6.4.4 RF DRIVE TUNING PWB..........................................................................................6-4
6.5 RF POWER STAGE................................................................................................. 6-5
6.5.1 DISTRIBUTION PWB................................................................................................6-5
6.5.1.1 Fan Control........................................................................................................6-5
6.5.1.2 High Temperature Detector..................................................................................6-5
6.5.1.3 Stress Current Detector ......................................................................................6-5
6.5.1.4 Fan Current Limiters ...........................................................................................6-6
6.5.1.5 Power Module Interlock.......................................................................................6-6
6.5.2 RF POWER MODULE ..............................................................................................6-6
6.5.3 RF COMBINER/OUTPUT FILTER...............................................................................6-6
6.5.3.1 8-Input Combiner Filter .......................................................................................6-6
6.5.3.2 RF Output Filter .................................................................................................6-6
6.5.3.3 RF Current Probe PWB.......................................................................................6-6
6.5.3.4 Forward/Reflected Power Probe...........................................................................6-6
6.5.3.5 Static Drain Assembly........................................................................................6-6
6.5.3.6 Surge Arrestor Assembly....................................................................................6-7
6.5.3.7 Capacitive Divider Assembly................................................................................6-7
6.5.3.8 RF Current Probe Assembly................................................................................6-7
6.6 CONTROL/MONITOR FUNCTION ............................................................................. 6-7
6.6.1 SYSTEM CONTROL PWB (A1A3).............................................................................6-7
6.6.2 RF POWER METER.................................................................................................6-7
6.6.3 DC VOLTS METER..................................................................................................6-7
6.6.4 REMOTE CONTROL CIRCUITS .................................................................................6-7
6.6.5 RF ON/OFF CONTROL.............................................................................................6-8
6.6.6 PRESET POWER LEVEL SELECT...........................................................................6-8
6.6.7 EXCITER A/B SELECT.............................................................................................6-8
6.6.8 RF POWER TRIM ....................................................................................................6-8
6.6.9 SYSTEM RESET.....................................................................................................6-8
6.6.10 PWM INHIBIT CONTROL ..........................................................................................6-8
6.6.11 ALARM RECALL......................................................................................................6-8
6.6.12 CUTBACK RESET....................................................................................................6-8
6.6.13 RF PERFORMANCE MONITORING...........................................................................6-8
6.6.13.1 Forward Power Level...........................................................................................6-9
6.6.13.2 Reflected Power Level.........................................................................................6-9
6.6.13.3 RF Monitor Sample.............................................................................................6-9
6.6.14 REMOTE ALARM INDICATIONS................................................................................6-9
6.6.14.1 RF Stress Current Alarm.....................................................................................6-9
6.6.14.2 AC Fail Alarm ....................................................................................................6-9
6.6.14.3 Battery Alarm.....................................................................................................6-9
6.6.14.4 VSWR Shutback Alarm ......................................................................................6-9
6.6.14.5 Cutback Alarm...................................................................................................6-9
6.6.14.6 Internal interlock Alarm ..................................................................................... 6-10
6.6.14.7 External Interlock Alarm.................................................................................... 6-10

12 000 WATT AM BROADCAST TRANSMITTER
XL12
Contents (Page 8)
01 January 2002
TABLE OF CONTENTS (Continued)
Section
6THEORY OF OPERATION (Continued)
6.6.14.8 Filter Temperature Alarm................................................................................... 6-10
6.6.14.9 Power Supply Temperature Alarm...................................................................... 6-10
6.6.14.10 Power Module Alarm......................................................................................... 6-10
6.6.14.11 Power Supply Alarm......................................................................................... 6-10
6.6.14.12 Modulation Protection Alarm.............................................................................. 6-10
6.6.14.13 PDM Inhibit Alarm ............................................................................................ 6-10
6.6.14.14 Standby Alarm................................................................................................. 6-10
6.6.15 REMOTE STATUS INDICATIONS ............................................................................ 6-10
6.6.15.1 Remote Status................................................................................................. 6-10
6.6.15.2 RF On Status................................................................................................... 6-11
6.6.15.3 Exciter B Status............................................................................................... 6-11
6.6.15.4 Power Level Status........................................................................................... 6-11
6.7 AC/DC POWER SUPPLY ....................................................................................... 6-11
6.7.1 MAIN POWER TRANSFORMER............................................................................. 6-11
6.7.2 B+ POWER SUPPLY/DISTRIBUTION...................................................................... 6-11
6.7.2.1 3ø Rectifier...................................................................................................... 6-12
6.7.2.2 Power Supply Monitor PWB.............................................................................. 6-12
6.7.3 DC POWER SUPPLY PWB.................................................................................... 6-12
6.7.3.1 Power Supply Temp Monitor.............................................................................. 6-12
6.7.3.2 B+ Monitor....................................................................................................... 6-12
6.7.3.3 Relay Controls ................................................................................................. 6-12
6.7.3.4 Low Voltage Supply.......................................................................................... 6-12
6.7.4 DC POWER SUPPLY MONITOR PWB.................................................................... 6-13
6.7.4.1 AC Fail Detector............................................................................................... 6-13
7COMPONENT LEVEL TROUBLE SHOOTING
7.1 TROUBLE SHOOTING REFERENCE DATA ............................................................... 7-1
7.2 AC/DC POWER SUPPLY ......................................................................................... 7-1
7.3 EXCITER STAGE..................................................................................................... 7-1
7.3.1 EXCITER INTERFACE PWB......................................................................................7-1
7.3.2 RF DRIVE PWB.......................................................................................................7-1
7.3.3 DC POWER SUPPLY PWB......................................................................................7-1
7.3.4INTERPHASE PDM DRIVER PWB............................................................................7-1
7.3.5 FREQUENCY SYNTHESIZER PWB ..........................................................................7-1
7.3.6 C-QUAM STEREO EXCITER PWB ............................................................................7-1
7.4 RF DRIVE STAGE.................................................................................................... 7-1
7.4.1 REGULATED POWER SUPPLY PWB.......................................................................7-1
7.4.2 RF DRIVE AMPLIFIER..............................................................................................7-1
7.4.3 RF DRIVE TUNING PWB..........................................................................................7-1
7.5 RF POWER STAGE................................................................................................. 7-1
7.5.1 DISTRIBUTION PWB................................................................................................7-1
7.5.2 RF POWER MODULE ..............................................................................................7-2
7.6 CONTROL/MONITOR FUNCTION ............................................................................. 7-2
7.6.1 SYSTEM CONTROL PWB........................................................................................7-2

12 000 WATT AM BROADCAST TRANSMITTER
XL12
Contents (Page 9)
01 January 2002
TABLE OF CONTENTS (Continued)
Section
8PARTS LIST
8.1 INTRODUCTION ...................................................................................................... 8-1
8.2 FAMILY TREE ......................................................................................................... 8-1
8.3 MANUFACTURER'S INDEX ...................................................................................... 8-1
8.4 HOW TO LOCATE INFORMATION FOR A SPECIFIC PART....................................... 8-1
8.4.1 WHEN NAUTEL CONFIGURATION CONTROL NUMBER IS KNOWN...........................8-1
8.4.2 WHEN REF DES IS KNOWN....................................................................................8-1
8.5 REFERENCE DESIGNATION INDEXES ..................................................................... 8-1
8.6 COLUMN CONTENT EXPLANATION ........................................................................ 8-1
8.6.1 USE CODE COLUMN...............................................................................................8-1
8.6.2 REF DES COLUMN..................................................................................................8-2
8.6.3 NAME OF PART AND DESCRIPTION COLUMN.........................................................8-2
8.6.4 NAUTEL'S PART NO. COLUMN................................................................................8-2
8.6.5 JAN/MIL/OEM PART NO. COLUMN...........................................................................8-2
8.6.6 X/Y GRID COLUMN..................................................................................................8-2
8.6.7 OEM CODE COLUMN..............................................................................................8-2
9ELECTRICAL SCHEMATICS
9.1 INTRODUCTION ...................................................................................................... 9-1
9.2 COMPONENT VALUES ............................................................................................ 9-2
9.3 GRAPHIC SYMBOLS............................................................................................... 9-1
9.4 LOGIC SYMBOLS ................................................................................................... 9-1
9.5 REFERENCE DESIGNATIONS .................................................................................. 9-1
9.6 UNIQUE SYMBOLOGY............................................................................................. 9-1
9.6.1 TYPE OF INPUTS/OUTPUTS ....................................................................................9-1
9.6.2 LOGIC LEVEL/CONVENTION....................................................................................9-1
9.7 IDENTIFICATION OF SCHEMATIC DIAGRAMS......................................................... 9-1
9.8 STRUCTURE OF SCHEMATICS ............................................................................... 9-1
9.9 LOCATING A PART/ASSEMBLY IDENTIFIED ON A SCHEMATIC .............................. 9-2
9.10 LOCATING THE SCHEMATIC DIAGRAM(S) FOR A FUNCTIONAL BLOCK ................. 9-2
9.10.1 WHEN FIGURE NUMBER IDENTIFIED......................................................................9-2
9.10.2 WHEN REFERENCE DESIGNATION ASSIGNED TO BLOCK......................................9-2
9.10.3 TITLE OF BLOCK.....................................................................................................9-2
10 MECHANICAL DRAWINGS
10.1 INTRODUCTION .................................................................................................... 10-1
10.2 CONTENT OF MECHANICAL DRAWINGS............................................................... 10-1
10.3 LOCATING ASSEMBLY DETAIL DRAWINGS.......................................................... 10-1

12 000 WATT AM BROADCAST TRANSMITTER
XL12
Contents (Page 10)
01 January 2002
LIST OF ILLUSTRATIONS
Number Title Page
2-1 Single Ended Input Selected..................................................................................................2-5
2-2 Differential Input Selected......................................................................................................2-6
2-3 Ground Stud Assembly Detail.............................................................................................. 2-14
2-4 External Input/Output Interface............................................................................................. 2-20
2-5 Balanced Drive ƒc Input Waveform........................................................................................ 2-29
2-6 Balanced RF Amplifier Output.............................................................................................. 2-30
2-7 2ƒPDM Frequency Waveform............................................................................................... 2-30
2-8 RF Output with Positive Peak Limiting.................................................................................. 2-35
4-1 Latching Alarms...................................................................................................................4-6
4-2 Non-Latching Alarms (RF Inhibiting) .......................................................................................4-6
4-3 Non-Latching Alarms (No RF Inhibit).......................................................................................4-6
5-1 RF Drive Amplifier Output Waveform.......................................................................................5-6
5-2 ƒc Output Waveform .............................................................................................................5-6
5-3 RF Drive Waveform...............................................................................................................5-7
5-4 Interphase PDM Waveform....................................................................................................5-7
5-5 Interphase PDM Waveform....................................................................................................5-8
5-6 ƒpdm Waveform....................................................................................................................5-8
5-7 Chopper Control Waveform....................................................................................................5-9
7-1 ƒc Unbalanced Drive .............................................................................................................7-4
7-2 2ƒPDM Unbalanced Drive.........................................................................................................7-4
7-3 Carrier Frequency ƒc.............................................................................................................7-4
7-4 Mod Level Detector Input.......................................................................................................7-6
7-5 Mod Level Detector Output ....................................................................................................7-6
7-6 Audio with Positive Peak Limiting...........................................................................................7-7
7-7 Carrier Level Control Input......................................................................................................7-7
7-8 Carrier Level Control Output...................................................................................................7-7
7-9 Linear Integrator Output.........................................................................................................7-7
7-10 Interphase Generator Input - PDM 1.......................................................................................7-8
7-11 Interphase Generator Input - PDM 2.......................................................................................7-8
7-12 PDM1 Output.......................................................................................................................7-8
7-13 PDM2 Output.......................................................................................................................7-8
7-14 ƒPDM Output..........................................................................................................................7-9
7-15 RF Amplifier Output ............................................................................................................ 7-11
7-16 RF Amplifier Input............................................................................................................... 7-11
7-17 Tuned RF Drive................................................................................................................... 7-12
7-18 PDM Carrier Reference....................................................................................................... 7-14
7-19 Watchdog Timer Output ...................................................................................................... 7-14
8-1 Family Tree - XL12 12kW AM Broadcast Transmitter..............................................................8-6

12 000 WATT AM BROADCAST TRANSMITTER
XL12
Contents (Page 11)
01 January 2002
LIST OF ILLUSTRATIONS (Continued)
Number Title Page
SD-1 Electrical Schematic - XL12 - 12 000 Watt AM Broadcast Transmitter.................................... SD-1
SD-2 Electrical Schematic - Exciter Stage................................................................................... SD-2
SD-3 Electrical Schematic - RF Drive Stage................................................................................. SD-3
SD-4 Electrical Schematic - RF Power Stage............................................................................... SD-4
SD-5 Electrical Schematic - Control/Monitor Functions ................................................................. SD-5
SD-6 Electrical Schematic - AC/DC Power Stage......................................................................... SD-6
SD-7 Electrical Schematic - Remote Interface PWB (NAPI25A)..................................................... SD-7
SD-8 Electrical Schematic - Exciter Interface PWB (NAPI22E)...................................................... SD-8
SD-9 Electrical Schematic - RF Drive Tuning PWB (NAPI59)......................................................... SD-9
SD-10 Electrical Schematic - Distribution PWB (NAPI50B)............................................................SD-10
SD-11 Electrical Schematic - DC Power Supply PWB (NAPS16C)..................................................SD-11
SD-12 Electrical Schematic - DC Power Supply Monitor PWB (NAPI48B).......................................SD-12
SD-13 Electrical Schematic - RF Combiner/Output Filter (NAF101A/NAF102)..................................SD-13
MD-1 Assembly Detail - XL12 12 000 Watt AM Broadcast Transmitter (Top and Front).....................MD-1
MD-2 Assembly Detail - XL12 12 000 Watt AM Broadcast Transmitter (Rear and Sides)...................MD-2
MD-3 Assembly Detail - NAC101 Control/Monitor Panel.................................................................MD-3
MD-4 Assembly Detail - NAPD07/01 and NAPD07/02 Meter/Switch Monitor PWBs .........................MD-4
MD-5 Assembly Detail - NAPI25A Remote Interface PWB .............................................................MD-5
MD-6 Assembly Detail - NAEE37A Exciter Panel..........................................................................MD-6
MD-7 Assembly Detail - NAPI22E Exciter Interface PWB ..............................................................MD-7
MD-8 Assembly Detail - NAE83 RF Drive Panel............................................................................MD-8
MD-9 Assembly Detail - NAAA02 RF Drive Amplifier......................................................................MD-9
MD-10A Assembly Detail - NAPI60/01 and NAPI60/02 RF Drive Tuning PWB..................................MD-10A
MD-10B Assembly Detail - NAPI60/03 and NAPI60/04 RF Drive Tuning PWB..................................MD-10B
MD-11 Assembly Detail - NAPS10B Regulated Power Supply PWB...............................................MD-11
MD-12 Assembly Detail - NAPI50B Distribution PWB....................................................................MD-12
MD-13 Assembly Detail - Fan Tray (P/N 183-8350) .......................................................................MD-13
MD-14 Assembly Detail - NAF102 RF Output Filter (Top View).......................................................MD-14
MD-15 Assembly Detail - NAF102 RF Output Filter (Rear View).....................................................MD-15
MD-16 Assembly Detail - NAFP90 Forward/Reflected Power Probe................................................MD-16
MD-17 Assembly Detail - NAX161 Static Drain Choke...................................................................MD-17
MD-18 Assembly Detail - NAF101A 8-Input RF Combiner/Filter (Rear View)....................................MD-18
MD-19 Assembly Detail - NAF101A 8-Input RF Combiner/Filter (Side View) ....................................MD-19
MD-20 Assembly Detail - NAPP02 RF Current Probe PWB ...........................................................MD-20
MD-21 Assembly Detail - Capacative Divider Assembly (176-8253).................................................MD-21
MD-22 Assembly Detail - NAX202/04 Surge Arrestor Assembly (DWA00-555).................................MD-22
MD-23 Assembly Detail - NASR104A AC/DC Power Supply (Top View)..........................................MD-23
MD-24 Assembly Detail - NASR105 & /01 Power Transformer Assembly ........................................MD-24
MD-25 Assembly Detail - 3ø Rectifier (UP28) ...............................................................................MD-25
MD-26 Assembly Detail - NAPS16C DC Power Supply PWB.........................................................MD-26
MD-27 Assembly Detail - NAPI48B DC Power Supply Monitor PWB...............................................MD-27
MD-28 Dimensional Information - XL12 12 000 Watt AM Broadcast Transmitter ...............................MD-28
MD-29 Assembly/Dimensional Information - NAX165 Circuit Breaker Enclosure...............................MD-29