Nautel ND2000A-02x-xx0 Series Owner's manual

e-mail: [email protected]
web: www.nautel.com
Nautel Maine Inc. Nautel Limited
201 Target Industrial Circle, 10089 Peggy’s Cove Road
Bangor, Maine USA 04401 Hackett’s Cove, NS Canada B3Z 3J4
Phone: [phone] Phone: [phone]
Fax: [phone] Fax: [phone]
ISO 9002 REGISTERED ISO 9001 REGISTERED
© Copyright 2005 NAUTEL. All rights reserved
TECHNICAL INSTRUCTIONS
ND2000A - 02x - xx0
RADIOBEACON TRANSMITTER
500 WATTS
(190 kHz to 535 kHz)
NAPE72 Keyer PWB
Original Issue ....................15 October 2004
Change 1...........................15 January 2005

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Effective Pages (Page 1)
15 January 2005
LIST OF EFFECTIVE PAGES
The list of effective pages lists the status of all pages in this manual. Pages of the original issue are identified by a
zero in the Change No. column. Pages subsequently changed are identified by the date of the change number. On a
changed page, the text affected by the latest change is indicated by a vertical bar in the margin opposite the changed
material.
Original Issue ........................................... 15 October 2004
Change 1 ...................................................15 January 2005
Total number of printed sides in this manual is 245 as listed below:
CHANGE CHANGE
PAGE # DATE PAGE # DATE
Title 0 15 January 2005
Title (Rear) - Blank
Effective (1) 1 15 January 2005
Effective (2) 1 15 January 2005
Effective (3) 1 15 January 2005
Effective (4) - Blank
Safety (1) 0 15 October 2004
Safety (2) 0 15 October 2004
Safety (3) 0 15 October 2004
Safety (4) 0 15 October 2004
Warranty (1) 0 15 October 2004
Warranty (2) 0 15 October 2004
Contents (1) 0 15 October 2004
Contents (2) 0 15 October 2004
Contents (3) 0 15 October 2004
Contents (4) 0 15 October 2004
Contents (5) 0 15 October 2004
Contents (6) 0 15 October 2004
Contents (7) 0 15 October 2004
Contents (8) 0 15 October 2004
Contents (9) 0 15 October 2004
Contents (10) 1 15 January 2005
1-1 0 15 October 2004
1-2 0 15 October 2004
1-3 0 15 October 2004
1-4 0 15 October 2004
1-5 0 15 October 2004
1-6 0 15 October 2004
1-7 1 15 January 2005
1-8 0 15 October 2004
2-1 1 15 January 2005
2-2 1 15 January 2005
2-3 0 15 October 2004
2-4 0 15 October 2004
2-5 1 15 January 2005
2-6 0 15 October 2004
2-7 0 15 October 2004
2-8 0 15 October 2004
2-9 0 15 October 2004
2-10 0 15 October 2004
2-11 1 15 January 2005
2-12 0 15 October 2004
2-13 0 15 October 2004
2-14 0 15 October 2004
2-15 1 15 January 2005
2-16 1 15 January 2005
2-17 0 15 October 2004
2-18 0 15 October 2004
3-1 0 15 October 2004
3-2 0 15 October 2004
3-3 0 15 October 2004
3-4 0 15 October 2004
3-5 0 15 October 2004
3-6 0 15 October 2004
3-7 1 15 January 2005
3-8 1 15 January 2005
3-9 0 15 October 2004
3-10 0 15 October 2004
3-11 0 15 October 2004
3-12 0 15 October 2004
3-13 0 15 October 2004
3-14 0 15 October 2004
3-15 0 15 October 2004
3-16 0 15 October 2004
4-1 0 15 October 2004
4-2 0 15 October 2004
4-3 1 15 January 2005
4-4 1 15 January 2005

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Effective Pages (Page 2)
15 January 2005
LIST OF EFFECTIVE PAGES (Continued)
CHANGE CHANGE
PAGE # DATE PAGE # DATE
4-5 0 15 October 2004
4-6 0 15 October 2004
4-7 0 15 October 2004
4-8 0 15 October 2004
4-9 0 15 October 2004
4-10 0 15 October 2004
4-11 0 15 October 2004
4-12 0 15 October 2004
4-13 0 15 October 2004
4-14 0 15 October 2004
4-15 0 15 October 2004
4-16 0 15 October 2004
4-17 0 15 October 2004
4-18 0 15 October 2004
5-1 0 15 October 2004
5-2 0 15 October 2004
5-3 0 15 October 2004
5-4 1 15 January 2005
5-5 0 15 October 2004
5-6 0 15 October 2004
5-7 0 15 October 2004
5-8 0 15 October 2004
5-9 0 15 October 2004
5-10 0 15 October 2004
5-11 0 15 October 2004
5-12 0 15 October 2004
5-13 0 15 October 2004
5-14 0 15 October 2004
5-15 0 15 October 2004
5-16 0 15 October 2004
5-17 0 15 October 2004
5-18 0 15 October 2004
5-19 0 15 October 2004
5-20 0 15 October 2004
5-21 0 15 October 2004
5-22 0 15 October 2004
5-23 0 15 October 2004
5-24 0 15 October 2004
5-25 0 15 October 2004
5-26 0 15 October 2004
5-27 1 15 January 2005
5-28 1 15 January 2005
5-29 0 15 October 2004
5-30 0 15 October 2004
5-31 1 15 January 2005
5-32 - Blank
6-1 0 15 October 2004
6-2 0 15 October 2004
6-3 0 15 October 2004
6-4 0 15 October 2004
6-5 0 15 October 2004
6-6 0 15 October 2004
6-7 0 15 October 2004
6-8 0 15 October 2004
6-9 0 15 October 2004
6-10 0 15 October 2004
6-11 0 15 October 2004
6-12 0 15 October 2004
6-13 0 15 October 2004
6-14 - Blank
7-1 0 15 October 2004
7-2 0 15 October 2004
7-3 0 15 October 2004
7-4 0 15 October 2004
7-5 0 15 October 2004
7-6 0 15 October 2004
7-7 0 15 October 2004
7-8 0 15 October 2004
7-9 0 15 October 2004
7-10 0 15 October 2004
7-11 0 15 October 2004
7-12 0 15 October 2004
7-13 0 15 October 2004
7-14 0 15 October 2004
7-15 0 15 October 2004
7-16 0 15 October 2004
7-17 0 15 October 2004
7-18 0 15 October 2004
7-19 0 15 October 2004
7-20 0 15 October 2004
7-21 0 15 October 2004
7-22 0 15 October 2004
7-23 0 15 October 2004
7-24 0 15 October 2004
7-25 0 15 October 2004
7-26 0 15 October 2004
7-27 0 15 October 2004
7-28 0 15 October 2004
7-29 0 15 October 2004
7-30 0 15 October 2004
7-31 0 15 October 2004
7-32 0 15 October 2004
7-33 0 15 October 2004
7-34 0 15 October 2004
7-35 0 15 October 2004
7-36 0 15 October 2004

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Effective Pages (Page 3)
15 January 2005
LIST OF EFFECTIVE PAGES (Continued)
CHANGE CHANGE
PAGE No. DATE PAGE No. DATE
7-37 0 15 October 2004
7-38 0 15 October 2004
7-39 0 15 October 2004
7-40 0 15 October 2004
7-41 0 15 October 2004
7-42 0 15 October 2004
8-1 0 15 October 2004
8-2 0 15 October 2004
8-3 0 15 October 2004
8-4 0 15 October 2004
8-5 0 15 October 2004
8-6 0 15 October 2004
8-7 0 15 October 2004
8-8 0 15 October 2004
8-9 0 15 October 2004
8-10 0 15 October 2004
8-11 0 15 October 2004
8-12 0 15 October 2004
8-13 0 15 October 2004
8-14 0 15 October 2004
8-15 0 15 October 2004
8-16 0 15 October 2004
8-17 0 15 October 2004
8-18 0 15 October 2004
8-19 0 15 October 2004
8-20 0 15 October 2004
8-21 0 15 October 2004
8-22 0 15 October 2004
9-1 0 15 October 2004
9-2 0 15 October 2004
9-3 0 15 October 2004
9-4 - Blank
SD-1 0 15 October 2004
SD-2 0 15 October 2004
SD-3 0 15 October 2004
SD-4 0 15 October 2004
SD-5 0 15 October 2004
SD-6 0 15 October 2004
SD-7 0 15 October 2004
SD-8 0 15 October 2004
SD-9 0 15 October 2004
SD-10 0 15 October 2004
SD-11 0 15 October 2004
SD-12 0 15 October 2004
SD-13 0 15 October 2004
SD-14 0 15 October 2004
10-1 0 15 October 2004
10-2 0 15 October 2004
MD-1 0 15 October 2004
MD-2 0 15 October 2004
MD-3A 0 15 October 2004
MD-3B 0 15 October 2004
MD-4 0 15 October 2004
MD-5 0 15 October 2004
MD-6 0 15 October 2004
MD-7 0 15 October 2004
MD-8 0 15 October 2004
MD-9 0 15 October 2004
MD-10 0 15 October 2004
MD-11 0 15 October 2004
MD-12 0 15 October 2004
MD-13 0 15 October 2004
MD-14 0 15 October 2004
MD-15 0 15 October 2004
MD-16 0 15 October 2004
MD-17 0 15 October 2004
MD-18 0 15 October 2004
MD-19 0 15 October 2004
MD-20 0 15 October 2004
MD-21 0 01June 2004
MD-22 0 15 October 2004
MD-23 0 15 October 2004
MD-24 0 15 October 2004
MD-25 0 15 October 2004
MD-26 0 15 October 2004
MD-27 0 15 October 2004
MD-28 0 15 October 2004
MD-29 0 15 October 2004
MD-30 0 15 October 2004
MD-31 0 15 October 2004
MD-32 0 15 October 2004
MD-33 0 15 October 2004
MD-34 0 15 October 2004
MD-35 0 15 October 2004
MD-36 0 15 October 2004
MD-37 0 15 October 2004
MD-38 0 15 October 2004

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Safety (Page 1)
15 October 2004
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

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Safety (Page 2)
15 October 2004
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.

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Safety (Page 3)
15 October 2004
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.

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Safety (Page 4)
15 October 2004
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 manual’s 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.

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Warranty (Page 1)
15 October 2004
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.

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Warranty (Page 2)
15 October 2004
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 Circle Facsimile 207-947-3693
Bangor, Maine 04401
All other customers use: Nautel Limited Telephone [phone] (24 hours)
10089 Peggy’s Cove Road Facsimile 902-823-3183
Hackett’s Cove, NS, Canada E-Mail [email protected]
B3Z 3J4 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

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Contents (Page 1)
15 January 2005
TABLE OF CONTENTS
Section Page
1 GENERAL INFORMATION
1.1 INTRODUCTION................................................................................................................... 1-1
1.2 PURPOSE AND SCOPE OF MANUAL .............................................................................. 1-1
1.3 PURPOSE OF EQUIPMENT................................................................................................ 1-1
1.4 FACTORY REPAIR SERVICE............................................................................................. 1-1
1.5 MECHANICAL DESCRIPTION............................................................................................ 1-1
1.5.1 TRANSMITTER CHASSIS.................................................................................................... 1-1
1.6 DUPLICATED MODULES/ASSEMBLIES .......................................................................... 1-2
1.7 TECHNICAL SUMMARY ..................................................................................................... 1-2
1.8 SPECIAL TOOLS AND TEST EQUIPMENT....................................................................... 1-2
1.9 GLOSSARY OF TERMS ...................................................................................................... 1-2
2 THEORY OF OPERATION
2.1 GENERAL ............................................................................................................................. 2-1
2.2 TRANSMITTER DESCRIPTION .......................................................................................... 2-1
2.3 CONTROL/MONITOR PANEL............................................................................................. 2-1
2.3.1 LOCAL/REMOTE CONTROL............................................................................................... 2-1
2.3.2 NORMAL\BYPASS CONTROL ............................................................................................ 2-1
2.3.3 RF CONTROL SWITCH ....................................................................................................... 2-1
2.3.4 ALARM LAMPS..................................................................................................................... 2-2
2.3.4.1 Battery-Alarm Lamp........................................................................................................ 2-2
2.3.4.2 RF Current-Alarm Lamp.................................................................................................2-2
2.3.4.3 SWR-Alarm Lamp........................................................................................................... 2-2
2.3.4.4 Standby-Alarm Lamp...................................................................................................... 2-2
2.3.4.5 Shutdown-Alarm Lamp...................................................................................................2-2
2.3.5 SELECT MAIN TX SWITCHING .......................................................................................... 2-2
2.3.6 SWITCHED METERING....................................................................................................... 2-2
2.3.6.1 Test-Power/Mod Meter/Switch....................................................................................... 2-2
2.3.6.2 Test Volts/Current Meter/Test Switch ............................................................................ 2-2
2.4 MODULATOR/POWER AMPLIFIER MODULE.................................................................. 2-2
2.4.1 MODULATOR (A2A1)........................................................................................................... 2-3
2.4.2 POWER AMPLIFIER (A2A2) ................................................................................................ 2-3
2.5 EXCITER MODULE .............................................................................................................. 2-4
2.5.1 +15 VDC REGULATOR........................................................................................................2-4
2.5.2 -15 VDC REGULATOR......................................................................................................... 2-4
2.5.3 KEYING/MOD SWITCH........................................................................................................2-4
2.5.4 POWER TRIM ....................................................................................................................... 2-4
2.5.5 KEYER PWB (A4A1)............................................................................................................. 2-5
2.5.6 RF OSCILLATOR PWB (A4A3)............................................................................................ 2-6
2.5.6.1 Crystal Oscillator............................................................................................................. 2-6
2.5.6.2 External RF Drive Input .................................................................................................. 2-6
2.5.7 RF SYNTHESIZER PWB (A4A3) ......................................................................................... 2-6
2.5.8 RF DRIVE AMPLIFIER (A4A4)............................................................................................. 2-6
2.5.9 MODULATOR DRIVER PWB (A4A2) .................................................................................. 2-6
2.5.9.1 Voice Audio Filter............................................................................................................ 2-7
2.5.9.2 Voice Audio Amplifier/Limiter .........................................................................................2-7
2.5.9.3 Emission Mode Multiplexer ............................................................................................ 2-7

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Contents (Page 2)
15 January 2005
TABLE OF CONTENTS (Continued)
Section Page
2 THEORY OF OPERATION (Continued)
2.5.9.4 Line Volts Compensation/Power Trim Control .............................................................. 2-7
2.5.9.5 PWM Square-Wave Generator ...................................................................................... 2-7
2.5.9.6 Ramp Integrator.............................................................................................................. 2-7
2.5.9.7 Linear Attenuator ............................................................................................................ 2-8
2.5.9.8 Variable Pulse-Width Generator .................................................................................... 2-8
2.5.9.10 Balanced Drive ............................................................................................................... 2-8
2.5.9.11 Pulse-Width Fault Detector ............................................................................................ 2-9
2.5.9.12 RF Drive Alarm Circuit.................................................................................................... 2-9
2.6 POWER ON/OFF PANEL ASSEMBLY............................................................................... 2-9
2.7 POWER SUPPLY MODULES.............................................................................................. 2-9
2.7.1 POWER SUPPLY CONTROL PWB (A7A1) ........................................................................ 2-9
2.7.2 B- VDC To +24 VOLT DC CONVERTER PWB (A7A2) .................................................... 2-11
2.7.3 AC SUPPLY MONITOR (A7A3) ASSEMBLY .................................................................... 2-11
2.8 HARMONIC FILTER ASSEMBLY (A9)............................................................................. 2-11
2.8.1 RF CURRENT PROBE (A9A1) .......................................................................................... 2-11
2.8.2 FWD/REFL POWER PROBE (A9A2)................................................................................. 2-12
2.8.2.1 RF MON Switching ....................................................................................................... 2-12
2.9 MONITOR PWB (A10)........................................................................................................ 2-12
2.9.1 TEST SWITCH CONTROL................................................................................................. 2-12
2.9.2 RELAY SWITCHING........................................................................................................... 2-12
2.9.2.1 Remote On/Off Relay ................................................................................................... 2-12
2.9.2.2 A/B Main Select ............................................................................................................ 2-13
2.9.2.3 Shutdown Relay............................................................................................................ 2-13
2.9.2.4 Standby Relay .............................................................................................................. 2-13
2.9.3 MONITOR +15 VOLT DC REGULATOR ........................................................................... 2-13
2.9.4 MONITOR -15 VOLTS DC CIRCUIT.................................................................................. 2-13
2.9.5 MOD THRESHOLD CIRCUIT ............................................................................................ 2-13
2.9.6 CARRIER THRESHOLD CIRCUIT .................................................................................... 2-14
2.9.7 CHANGEOVER DELAY CIRCUIT ..................................................................................... 2-14
2.9.8 STANDBY CIRCUIT............................................................................................................ 2-14
2.9.9 SHUTDOWN CIRCUIT ....................................................................................................... 2-14
2.9.10 FORWARD POWER CAL................................................................................................... 2-15
2.9.11 AUDIO MONITOR CIRCUIT............................................................................................... 2-15
2.9.11.1 Speaker Control............................................................................................................ 2-15
2.9.12 RF CURRENT CIRCUIT ..................................................................................................... 2-15
2.9.13 SWR CUTBACK THRESHOLD CIRCUIT.......................................................................... 2-15
2.9.14 POWER TRIM INTERFACE CONTROL CIRCUIT............................................................ 2-16
2.9.15 REFLECTED POWER/REFL PWR CAL CIRCUIT ........................................................... 2-16
2.9.16 MOD% CONTROL CIRCUIT.............................................................................................. 2-16
2.9.17 AC POWER MONITOR CIRCUIT (DC Option Installed)................................................... 2-16
2.9.18 AC POWER MONITOR CIRCUIT (DC Option Not Installed) ............................................ 2-17
2.9.19 MONITOR BYPASS CIRCUIT............................................................................................ 2-17
2.10 BATTERY CONTROL PANEL (A11) ASSEMBLY........................................................... 2-17
2.10.1 BATTERY CONTROL PWB (A11A1)................................................................................. 2-17
2.10.1.1 Low Battery Voltage Monitor ........................................................................................ 2-18

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Contents (Page 3)
15 January 2005
TABLE OF CONTENTS (Continued)
Section Page
3 INSTALLATION AND PREPARATION FOR USE
3.1 GENERAL ............................................................................................................................ 3-1
3.1.1 VISUAL INSPECTION .......................................................................................................... 3-1
3.2 TEST EQUIPMENT............................................................................................................... 3-1
3.3 SITE REQUIREMENTS ........................................................................................................ 3-1
3.3.1 LIGHTNING/SAFETY GROUND .......................................................................................... 3-1
3.3.2 ANTENNA SYSTEM ............................................................................................................. 3-1
3.3.3 ELECTRICAL POWER .........................................................................................................3-1
3.3.3.1 AC Power Requirements................................................................................................ 3-1
3.3.3.2 DC Power Requirements ............................................................................................... 3-1
3.3.4 ELECTRICAL POWER CABLING........................................................................................ 3-2
3.3.5 RF FEED CABLE .................................................................................................................. 3-2
3.3.6 CONTROL/MONITOR CABLING ......................................................................................... 3-2
3.3.7 VENTILATION ...................................................................................................................... 3-2
3.3.8 HEATING............................................................................................................................... 3-2
3.3.9 WORK AREA......................................................................................................................... 3-2
3.4 EXTERNAL INPUT/OUTPUT CIRCUIT REQUIREMENTS................................................ 3-2
3.4.1 EXTERNAL AUDIO SOURCE.............................................................................................. 3-2
3.4.2 REMOTE CONTROL CIRCUITS.......................................................................................... 3-2
3.4.2.1 Standby '1' and Standby '2' Controls ............................................................................. 3-2
3.4.2.2 Battery Reset Control ..................................................................................................... 3-2
3.4.2.3 Power Trim 'A' and 'B' Controls...................................................................................... 3-2
3.4.2.4 Remote Off Control......................................................................................................... 3-2
3.4.2.5 A/B Main Select Control ................................................................................................. 3-2
3.4.2.6 Press-To-Talk Control .................................................................................................... 3-3
3.4.3 EXTERNAL STATUS MONITORING................................................................................... 3-3
3.4.3.1 External Forward Power Monitoring............................................................................... 3-3
3.4.3.2 External Reflected Power Monitoring............................................................................. 3-3
3.4.3.3 External Modulation Percentage Monitoring.................................................................. 3-3
3.4.3.4 Audio Monitor.................................................................................................................. 3-3
3.4.3.5 Internal Standby Monitoring ...........................................................................................3-3
3.4.3.6 SWR Standby Monitoring............................................................................................... 3-3
3.4.4 EXTERNAL ALARM MONITORING CIRCUITS .................................................................. 3-3
3.4.4.1 Standby-Alarm ................................................................................................................ 3-3
3.4.4.2 Shutdown-Alarm ............................................................................................................. 3-3
3.4.4.3 SWR-Alarm..................................................................................................................... 3-3
3.4.4.4 Battery Alarm .................................................................................................................. 3-4
3.5 UNPACKING......................................................................................................................... 3-4
3.5.1 TRANSMITTER CABINET CRATE ...................................................................................... 3-4
3.5.2 POWER SUPPLY MODULE CRATE................................................................................... 3-4
3.5.3 EXCITER AND MODULATOR/POWER AMPLIFIER MODULE CRATE ........................... 3-5
3.6 ANCILLARY PARTS ............................................................................................................3-5
3.7 USER ASSIGNED INFORMATION ..................................................................................... 3-5
3.7.1 CARRIER FREQUENCY ...................................................................................................... 3-5
3.7.2 TONE FREQUENCY............................................................................................................. 3-5
3.7.3 IDENTIFICATION CODE ......................................................................................................3-5
3.7.4 STANDBY CODES ............................................................................................................... 3-5
3.7.4.1 Standby 1 (A) Code ........................................................................................................ 3-5
3.7.4.2 Standby 2 (A) Code ........................................................................................................ 3-5
3.7.4.3 Standby 1 (B) Code ........................................................................................................ 3-5
3.7.4.4 Standby 2 (B) Code ........................................................................................................ 3-5

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Contents (Page 4)
15 January 2005
TABLE OF CONTENTS (Continued)
Section Page
3 INSTALLATION AND PREPARATION FOR USE (Continued)
3.7.5 MEAN LEVEL OF AC POWER SOURCE............................................................................ 3-5
3.8 PARTS REQUIRED BUT NOT SUPPLIED......................................................................... 3-6
3.8.1 OSCILLATOR CRYSTALS ................................................................................................... 3-6
3.9 PRE-INSTALLATION PROCEDURES................................................................................ 3-6
3.9.1 DISASSEMBLY REQUIRED ................................................................................................ 3-6
3.9.2 EXCITER MODULE PRE-INSTALLATION.......................................................................... 3-6
3.9.2.1 RF Synthesizer PWB...................................................................................................... 3-6
3.9.2.2 RF Oscillator PWB.......................................................................................................... 3-6
3.9.3 KEYER PWB PRE-INSTALLATION..................................................................................... 3-7
3.9.3.1 Keyer Content Configuration.......................................................................................... 3-7
3.9.3.2 Keyed Tone Frequency ..................................................................................................3-8
3.9.3.3 Keyed Tone Source........................................................................................................ 3-8
3.9.3.4 Keyed Fault Inhibit .......................................................................................................... 3-8
3.9.4 POWER TRANSFORMERS A7T1 and A8T1 PRIMARY TAP SELECTION...................... 3-8
3.9.5 HARMONIC FILTER PRE-INSTALLATION......................................................................... 3-9
3.10 INSTALLATION PROCEDURES....................................................................................... 3-11
3.10.1 TRANSMITTER MODULE INSTALLATION ...................................................................... 3-11
3.10.1.1 Power Supply Modules A7/A8...................................................................................... 3-11
3.10.1.2 Modulator/Power Amplifier Modules ............................................................................ 3-11
3.10.1.3 Exciter Modules ............................................................................................................ 3-11
3.10.2 EXTERNAL INPUT/OUTPUT INTERFACE CONNECTIONS........................................... 3-12
3.10.3 RF OUTPUT CABLE CONNECTION................................................................................. 3-12
3.10.4 LIGHTNING/SAFETY GROUND CONNECTION.............................................................. 3-12
3.10.5 AC AND DC POWER CONNECTION................................................................................ 3-12
3.11 FIRST STAGE (INITIAL START-UP)................................................................................. 3-13
3.12 SECOND STAGE (INITIAL START-UP) ........................................................................... 3-13
3.13 THIRD STAGE (INITIAL START-UP)................................................................................ 3-14
3.13.1 INTENDED CARRIER LEVEL............................................................................................ 3-14
3.13.2 RF MONITOR SIGNAL SOURCE SELECTION ................................................................ 3-14
3.13.3 INTENDED MODULATION DEPTH................................................................................... 3-14
4 OPERATING INSTRUCTIONS
4.1 GENERAL ............................................................................................................................ 4-1
4.2 EMERGENCY SHUTDOWN PROCEDURE ....................................................................... 4-1
4.3 CONTROLS AND INDICATORS ......................................................................................... 4-1
4.3.1 CONTROL/MONITOR PANEL CONTROLS AND INDICATORS....................................... 4-1
4.3.2 RF POWER MODULES CONTROLS AND INDICATORS ................................................. 4-1
4.3.3 EXCITER MODULE CONTROLS AND INDICATORS........................................................ 4-1
4.3.4 POWER ON/OFF PANEL CONTROLS AND INDICATORS .............................................. 4-1
4.3.5 POWER SUPPLY MODULE CONTROLS AND INDICATORS.......................................... 4-1
4.3.6 HARMONIC FILTER CONTROLS ....................................................................................... 4-1
4.3.7 MONITOR PWB CONTROLS AND INDICATORS.............................................................. 4-1
4.3.8 BATTERY PANEL CONTROLS AND INDICATORS .......................................................... 4-1
4.3.9 MISCELLANEOUS (CABINET/INTERFACE PANEL) CONTROLS AND INDICATORS .. 4-2
4.4 PRESTART-UP CHECKS .................................................................................................... 4-2
4.5 TURNING ON TRANSMITTER ............................................................................................ 4-2
4.6 RESETTING TRANSMITTER .............................................................................................. 4-2
4.7 MODULATION DEPTH WHEN USING A HIGH 'Q' ANTENNA ........................................ 4-2
4.7.1 RF CURRENT ALARM INDICATION................................................................................... 4-3

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Contents (Page 5)
15 January 2005
TABLE OF CONTENTS (Continued)
Section Page
4 OPERATING INSTRUCTIONS (Continued)
4.7.2 SWR-ALARM INDICATION .................................................................................................. 4-3
4.7.3 REMEDIAL ACTION IN BEACON MODE............................................................................ 4-3
4.7.4 REMEDIAL ACTION IN VOICE AND BEACON MODE ...................................................... 4-3
4.8 MODULATION PERCENTAGE INDICATION .................................................................... 4-4
5 TESTING AND ADJUSTMENT
5.1 GENERAL ............................................................................................................................ 5-1
5.2 OPERATING OF EQUIPMENT............................................................................................ 5-1
5.3 TEST/ADJUSTMENT PROCEDURES ................................................................................ 5-1
5.3.1 TEST/ADJUSTMENT TEST EQUIPMENT .......................................................................... 5-2
5.3.2 TEST/ADJUSTMENT PREREQUISITES............................................................................. 5-2
5.3.3 TRANSMITTER TURN-ON................................................................................................... 5-2
5.3.4 DC VOLTAGE CHECKS....................................................................................................... 5-3
5.3.4.1 B- Voltage (No Load) Check .......................................................................................... 5-3
5.3.4.2 Logic/Control DC Voltage Checks ................................................................................. 5-3
5.3.5 CARRIER FREQUENCY CHECK ........................................................................................ 5-4
5.3.5.1 RF Synthesizer Check.................................................................................................... 5-4
5.3.5.2 RF Oscillator Check........................................................................................................ 5-4
5.3.6 RF DRIVE OUTPUT LEVEL CHECK ................................................................................... 5-5
5.3.7 PULSE WIDTH MODULATION DRIVE CHECK.................................................................. 5-5
5.3.8 RF CARRIER CHECK........................................................................................................... 5-6
5.3.9 MODULATION DEPTH (MCW) CHECK.............................................................................. 5-6
5.3.10 B- VOLTAGE (MCW) CHECK .............................................................................................. 5-7
5.3.11 AUDIO LIMITER BALANCE CHECK ................................................................................... 5-7
5.3.12 MODULATION DEPTH (A3E MODE) CHECK .................................................................... 5-8
5.3.13 IDENTIFICATION CODE CHECK ........................................................................................ 5-9
5.3.14 STANDBY '1' AND STANDBY '2' CODE CHECKS ............................................................. 5-9
5.3.15 FAULT THRESHOLDS/CHANGEOVER CHECK ............................................................. 5-10
5.3.15.1 Preliminary Changeover Procedures........................................................................... 5-10
5.3.15.2 Carrier Level Threshold Check .................................................................................... 5-10
5.3.15.3 Modulation Depth Fault Threshold Check ................................................................... 5-11
5.3.15.4 Changeover/Shutdown Check ..................................................................................... 5-12
5.3.16 SWR CUTBACK THRESHOLD CHECK............................................................................ 5-15
5.3.17 RF CURRENT THRESHOLD CHECK ............................................................................... 5-16
5.3.18 ALARM SYSTEMS CHECK................................................................................................ 5-16
5.3.18.1 RF Current-Alarm Check.............................................................................................. 5-17
5.3.18.2 SWR-Alarm Check ....................................................................................................... 5-17
5.3.18.3 Shutdown-Alarm Check................................................................................................ 5-17
5.3.18.4 Standby-Alarm Check .................................................................................................. 5-17
5.3.18.5 Battery-Alarm Check .................................................................................................... 5-17
5.3.18.6 Mod Drive-Alarm Check ............................................................................................... 5-17
5.3.18.7 RF Drive-Alarm Check ................................................................................................. 5-18
5.3.19 LOW AC POWER CHECK ................................................................................................. 5-18
5.3.20 LOW BATTERY VOLTAGE MONITOR ............................................................................. 5-18
5.3.21 TEST/ADJUSTMENT OF SIDE B ...................................................................................... 5-19
5.4 SPECIAL ADJUSTMENT PROCEDURES ....................................................................... 5-19
5.4.1 CURRENT SHUNT RESISTOR ADJUSTMENT ............................................................... 5-19
5.4.2 TEST METER ADJUSTMENT............................................................................................ 5-20
5.4.2.1 Forward Power Reading .............................................................................................. 5-20

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Contents (Page 6)
15 January 2005
TABLE OF CONTENTS (Continued)
Section Page
5 TESTING AND ADJUSTMENT (Continued)
5.4.2.2 Reflected Power Reading ............................................................................................ 5-21
5.4.3 LOW AC VOLTAGE THRESHOLD ADJUSTMENT.......................................................... 5-21
5.4.4 LOW BATTERY VOLTAGE THRESHOLD ADJUSTMENT (DC OPTION INSTALLED). 5-22
5.4.4.1 Low Battery Voltage Threshold Adjustment Pre-requisites......................................... 5-22
5.4.4.2 Determination of Low Voltage Battery Threshold........................................................ 5-23
5.4.4.3 Finalization of Low Battery Voltage Threshold Adjustment......................................... 5-23
5.5 OPERATIONAL ADJUSTMENT PROCEDURES ............................................................ 5-24
5.5.1 OPERATIONAL ADJUSTMENT TEST EQUIPMENT ....................................................... 5-24
5.5.2 OPERATIONAL ADJUSTMENT PRE-REQUISITES ........................................................ 5-25
5.5.3 TRANSMITTER TURN-ON................................................................................................. 5-25
5.5.4 CARRIER LEVEL ADJUSTMENT ...................................................................................... 5-25
5.5.5 MODULATION DEPTH ADJUSTMENT............................................................................. 5-25
5.6 POST OPERATIONAL ADJUSTMENT PROCEDURES ................................................. 5-26
6 MAINTENANCE
6.1 GENERAL ............................................................................................................................ 6-1
6.2 ELECTRICAL SCHEMATICS/LOGIC DIAGRAMS ............................................................ 6-1
6.2.1 COMPONENT VALUES ....................................................................................................... 6-1
6.2.2 GRAPHIC SYMBOLS ........................................................................................................... 6-1
6.2.3 LOGIC SYMBOLS................................................................................................................. 6-1
6.2.4 REFERENCE DESIGNATIONS ........................................................................................... 6-1
6.3 WIRING INFORMATION ...................................................................................................... 6-1
6.3.1 TRANSMITTER CABINET WIRING..................................................................................... 6-1
6.3.2 CONTROL/MONITOR PANEL WIRING .............................................................................. 6-1
6.3.3 MODULATOR/POWER AMPLIFIER MODULE WIRING.................................................... 6-1
6.3.4 EXCITER MODULE WIRING ............................................................................................... 6-1
6.3.5 POWER ON/OFF PANEL WIRING ...................................................................................... 6-1
6.3.6 POWER SUPPLY MODULE WIRING.................................................................................. 6-1
6.3.7 B- VDC TO +24 VDC CONVERTER WIRING ..................................................................... 6-1
6.3.8 HARMONIC FILTER ASSEMBLY WIRING ......................................................................... 6-1
6.3.9 FWD/REFL POWER PROBE WIRING ................................................................................ 6-1
6.3.10 BATTERY CONTROL PANEL WIRING............................................................................... 6-2
6.3.11 INTERFACE PANEL ASSEMBLY WIRING ......................................................................... 6-2
6.4 MECHANICAL DRAWINGS ................................................................................................ 6-2
6.5 SCHEDULED MAINTENANCE............................................................................................ 6-2
6.6 CORRECTIVE MAINTENANCE .......................................................................................... 6-2
6.7 ISOLATION OF DEFECTIVE POWER MOSFETS............................................................. 6-2
6.7.1 ISOLATION OF DEFECTIVE POWER MOSFETs IN A POWER AMPLIFIER .................. 6-2
6.7.2 CHECK OF POWER MOSFET IN MODULATOR ASSEMBLY.......................................... 6-3
6.7.3 ISOLATION OF DEFECTIVE POWER MOSFETs IN RF DRIVE AMPLIFIER ASSY ....... 6-4
6.7.4 CHECK OF POWER MOSFET IN DC-DC CONVERTER ASSEMBLY ............................. 6-5
6.8 POWER MOSFET REPLACEMENT ................................................................................... 6-6
6.8.1 POWER MOSFET REPLACEMENT ON POWER AMPLIFIER ASSEMBLIES................. 6-6
6.8.2 POWER MOSFET REPLACEMENT ON MODULATOR ASSEMBLIES............................ 6-7
6.8.3 POWER MOSFET REPLACEMENT ON RF DRIVE AMPLIFIER ASSEMBLIES.............. 6-8
6.8.4 POWER MOSFET REPLACEMENT ON DC-DC CONVERTER ASSEMBLIES ............... 6-8

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Contents (Page 7)
15 January 2005
TABLE OF CONTENTS (Continued)
Section Page
7 PARTS LIST
7.1 INTRODUCTION................................................................................................................... 7-1
7.2 FAMILY TREE ...................................................................................................................... 7-1
7.3 MANUFACTURER'S INDEX................................................................................................ 7-1
7.4 HOW TO LOCATE INFORMATION FOR A SPECIFIC PART ......................................... 7-1
7.4.1 WHEN NAUTEL CONFIGURATION CONTROL NUMBER IS KNOWN............................ 7-1
7.4.2 WHEN REF DES IS KNOWN .............................................................................................. 7-1
7.5 REFERENCE DESIGNATION INDEXES ........................................................................... 7-1
7.6 COLUMN CONTENT EXPLANATION ................................................................................ 7-1
7.6.1 USE CODE COLUMN .......................................................................................................... 7-1
7.6.2 REF DES COLUMN ............................................................................................................. 7-2
7.6.3 NAME OF PART AND DESCRIPTION COLUMN............................................................... 7-2
7.6.4 NAUTEL'S PART NO. COLUMN ......................................................................................... 7-2
7.6.5 JAN/MIL/OEM PART NO. COLUMN.................................................................................... 7-2
7.6.6 X/Y GRID COLUMN.............................................................................................................. 7-2
7.6.7 OEM CODE COLUMN..........................................................................................................7-2
8 WIRING INFORMATION
8.1 INTRODUCTION................................................................................................................... 8-1
8.2 WIRING LISTS NOT PROVIDED ........................................................................................ 8-1
8.3 PRINTED WIRING PATTERNS .......................................................................................... 8-1
8.4 WIRE COLORS .................................................................................................................... 8-1
8.5 WIRING LISTS PROVIDED ................................................................................................. 8-1
9 ELECTRICAL SCHEMATICS
9.1 INTRODUCTION................................................................................................................... 9-1
9.2 COMPONENT VALUES. ..................................................................................................... 9-1
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 THE SCHEMATIC DIAGRAM(S) FOR A FUNCTIONAL BLOCK ................ 9-2
9.9.1 WHEN FIGURE NUMBER IDENTIFIED .............................................................................. 9-2
9.9.2 WHEN REFERENCE DESIGNATION ASSIGNED TO BLOCK ......................................... 9-2
9.9.3 TITLE OF BLOCK ................................................................................................................. 9-2
9.10 LOCATING A PART/ASSEMBLY IDENTIFIED ON A SCHEMATIC ................................ 9-2
10 MECHANICAL DRAWINGS
10.1 INTRODUCTION................................................................................................................. 10-1
10.2 LOCATING ASSEMBLY DETAIL DRAWINGS ................................................................ 10-1
10.3 CONTENT OF MECHANICAL DRAWINGS ..................................................................... 10-1
10.4 X/Y CO-ORDINATES ON PWB DRAWINGS ................................................................... 10-1

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Contents (Page 8)
15 January 2005
LIST OF ILLUSTRATIONS
Number Title Page
1-1 ND2000A Radiobeacon Transmitter .......................................................................................................... 1-3
1-2 Nautel's Identification .................................................................................................................................. 1-6
3-1 Positioning of Selector Plates E1 and E2 ................................................................................................. 3-10
3-2 External Input/Output Interface................................................................................................................. 3-16
6-1 Carrier Oscillator Frequency - CW ........................................................................................................... 6-10
6-2 Balanced Drive Output - CW .................................................................................................................... 6-10
6-3 Carrier Oscillator - CW .............................................................................................................................. 6-10
6-4 Balanced Drive Output - CW .................................................................................................................... 6-10
6-5 RF Drive Output (B- = 50 Vdc).................................................................................................................. 6-11
6-6 Not Used.................................................................................................................................................... 6-11
6-7 Tone Oscillator - CW................................................................................................................................. 6-11
6-8 Audio/Keyed Tone - MCW ........................................................................................................................ 6-11
6-9 PWM Ramp Integrator Output - CW......................................................................................................... 6-12
6-10 Mod Drive (PWM Output) - CW ................................................................................................................ 6-12
6-11 Mod Drive Alarm Condition ....................................................................................................................... 6-12
6-12 FWD Power Sample - MCW..................................................................................................................... 6-12
6-13 RF Current Status (RF Current lamp on) ................................................................................................. 6-13
6-14 RF Monitor................................................................................................................................................. 6-13
6-15 RF Monitor................................................................................................................................................. 6-13
7-1 Family Tree - ND2000A 500 Watt Radiobeacon Transmitter.................................................................... 7-6
SD-1 Electrical Schematic - ND2000A 500W Radiobeacon Transmitter (Sheet 1 of 2)................................. SD-1
SD-2 Electrical Schematic - ND2000A 500W Radiobeacon Transmitter (Sheet 2 of 2)................................. SD-2
SD-3 Electrical Schematic – NAC111/02 Control/Monitor Panel.....................................................................SD-3
SD-4 Electrical Schematic - NAP13B/02 Modulator/Power Amplifier Module................................................. SD-4
SD-5 Electrical Schematic - NAE45G Exciter Module ..................................................................................... SD-5
SD-6 Electrical Schematic – NAPE72 Keyer PWB .......................................................................................... SD-6
SD-7 Electrical Schematic - NAPE29C/02 Modulator Driver PWB (Sheet 1 of 2) .......................................... SD-7
SD-8 Electrical Schematic - NAPE29C/02 Modulator Driver PWB (Sheet 2 of 2) .......................................... SD-8
SD-9 Electrical Schematic - NAPE64A RF Oscillator (Optional DGPS Input) PWB ....................................... SD-9
SD-10 Electrical Schematic - NAS25B/03 & /04 Power Supply Module (NAPC26C/02 Control PWB) ......... SD-10
SD-11 Electrical Schematic - NAF46C/02 Harmonic Filter .............................................................................. SD-11
SD-12 Electrical Schematic - NAPC120/02 & NAPC120/04 Monitor PWB (Sheet 1 of 2).............................. SD-12
SD-13 Electrical Schematic - NAPC120/02 & NAPC120/04 Monitor PWB(Sheet 2 of 2)............................... SD-13
SD-14 Electrical Schematic - NAX50B/02 Battery Control Panel .................................................................... SD-14
MD-1 Assembly Detail - ND2000A 500W Radiobeacon Transmitter ..............................................................MD-1
MD-2 Assembly Detail – NAC111/02 Control/Monitor Panel (Front View) .....................................................MD-2
MD-3A Assembly Detail – NAC111/02 Control/Monitor Panel (Rear View) .................................................... MD-3A
MD-3B Assembly Detail - NAPD09/02 Display PWB ....................................................................................... MD-3B
MD-4 Assembly Detail - NAP13B/02 Modulator/Power Amplifier Module (Front View) ..................................MD-4
MD-5 Assembly Detail - NAP13B/02 Modulator/Power Amplifier Module (Top View).....................................MD-5
MD-6 Assembly Detail - NAP13B/02 Modulator/Power Amplifier Module (Left Side View) ............................MD-6
MD-7 Assembly Detail - NAP13B/02 Modulator/Power Amplifier Module (Right Side View)..........................MD-7
MD-8 Assembly Detail - NAP13B/02 Modulator/Power Amplifier Module (Bottom View) ...............................MD-8
MD-9 Assembly Detail - NAP13B/02 Modulator/Power Amplifier Module (Rear View)...................................MD-9
MD-10 Assembly Detail - NASM06/01 Modulator Assembly............................................................................MD-10
MD-11 Assembly Detail - NAA02/02 Power Amplifier.......................................................................................MD-11
MD-12 Assembly Detail - Display Interface PWB (P/N 156-1037-01)..............................................................MD-12
MD-13 Assembly Detail - NAE45G Exciter Module (Front View) .....................................................................MD-13
MD-14 Assembly Detail - NAE45G Exciter Module (Left Side View) ...............................................................MD-14

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Contents (Page 9)
15 January 2005
LIST OF ILLUSTRATIONS (Continued)
Number Title Page
MD-15 Assembly Detail - NAE45G Exciter Module (Right Side View).............................................................MD-15
MD-16 Assembly Detail - NAE45G Exciter Module (Rear View)......................................................................MD-16
MD-17 Assembly Detail - NAPE72 Keyer PWB ................................................................................................MD-17
MD-18 Assembly Detail - NAPE29C/02 Modulator Driver PWB ......................................................................MD-18
MD-19 Assembly Detail - NAPE64A RF Oscillator PWB (Optional DGPS Input)............................................MD-19
MD-20 Not used
MD-21 Assembly Detail - NAA21A/02 RF Drive Amplifier ................................................................................MD-21
MD-22 Assembly Detail - Power On/Off Panel (P/N 192-8130) .......................................................................MD-22
MD-23 Assembly Detail - NAS25B/03 & NAS25B/04 Power Supply Module (Front View).............................MD-23
MD-24 Assembly Detail - NAS25B/03 & NAS25B/04 Power Supply Module (Top View) ...............................MD-24
MD-25 Assembly Detail - NAS25B/03 & NAS25B/04 Power Supply Module (Rear View) .............................MD-25
MD-26 Assembly Detail - NAPC26C/02 Power Supply Control PWB..............................................................MD-26
MD-27 Assembly Detail - NASC01/04 B- VDC To +24 VDC Converter ..........................................................MD-27
MD-28 Assembly Detail - NAPC32A/01 & NAPC32A/02 AC Supply Monitor PWB ........................................MD-28
MD-29 Assembly Detail - Interface Panel (P/N 192-8110) ...............................................................................MD-29
MD-30 Assembly Detail - NAF46C/02 Harmonic Filter (Front View)................................................................MD-30
MD-31 Assembly Detail - NAF46C/02 Harmonic Filter (Rear View) ................................................................MD-31
MD-32 Assembly Detail - NAFP23/02 RF Current Probe .................................................................................MD-32
MD-33 Assembly Detail - NAFP24A/02 Forward/Reflected Power Probe .......................................................MD-33
MD-34 Assembly Detail - NAPC120/02 Monitor PWB......................................................................................MD-34
MD-35 Assembly Detail - NAPC120/04 Monitor PWB......................................................................................MD-35
MD-36 Assembly Detail - NAX50B/02 Battery Control Panel...........................................................................MD-36
MD-37 Assembly Detail - Battery Controller PWB (P/N 156-7164-01) ............................................................MD-37
MD-38 Assembly Detail - ND2000A Radiobeacon Transmitter ........................................................................MD-38
LIST OF TABLES
Number Title Page
1-1 Duplicated Modules/Assemblies................................................................................................................. 1-2
1-2 Technical Summary .................................................................................................................................... 1-4
1-3 Test Equipment ........................................................................................................................................... 1-7
1-4 Glossary of Terms....................................................................................................................................... 1-8
3-1 Crystal Operating Frequencies ................................................................................................................... 3-6
3-2 Selecting Primary Winding Taps of Power Transformer A7T1/A8T1........................................................ 3-8
3-3 Selecting Frequency Bank Links on Harmonic Filter A12 ........................................................................ 3-9
4-1 Preliminary Switch Settings ....................................................................................................................... 4-4
4-2 Control/Monitor Panel Controls and Indicators .......................................................................................... 4-5
4-3 Modulator/Power Amplifier Module Controls and Indicators...................................................................... 4-7
4-4 Exciter Module Controls and Indicators...................................................................................................... 4-8
4-5 Power On/Off Panel Controls and Indicators ........................................................................................... 4-12
4-6 Power Supply Module Controls and Indicators ........................................................................................ 4-13
4-7 Harmonic Filter Assembly Controls and Indicators .................................................................................. 4-14
4-8 Monitor/PWB Panel Controls and Indicators............................................................................................ 4-15
4-9 Battery Panel Controls and Indicators ...................................................................................................... 4-17
4-10 Miscellaneous (Cabinet/Interface Panel) Controls and Indicators........................................................... 4-18
5-1 dB to Power/Voltage Conversion.............................................................................................................. 5-13

500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Contents (Page 10)
15 January 2005
LIST OF TABLES (Continued)
Number Title Page
5-2 Functional Test/Adjustment Check List .................................................................................................... 5-27
5-3 Morse Code Characters............................................................................................................................ 5-31
7-1 Manufacturers' Code to Address Index ..................................................................................................... 7-3
7-2 Ref Des Index - ND2000A-02x-xx0 (500 Watt) Radiobeacon Transmitter ............................................... 7-7
7-3 Ref Des Index – NAC111/02 Control/Monitor Panel.................................................................................. 7-9
7-4 Ref Des Index - NAPD09/02 Display PWB .............................................................................................. 7-10
7-5 Ref Des Index - NAP13B/02 Modulator/Power Amplifier Module............................................................ 7-11
7-6 Ref Des Index - NASM06/01 Modulator Assembly.................................................................................. 7-13
7-7 Ref Des Index - NAA02/02 Power Amplifier............................................................................................. 7-14
7-8 Ref Des Index - NAE45G/02 and /04 Exciter Module.............................................................................. 7-15
7-9 Ref Des Index – NAPE72 Keyer PWB .................................................................................................... 7-16
7-10 Ref Des Index - NAPE29C/02 Modulator Driver PWB............................................................................. 7-19
7-11 Ref Des Index - NAPE64A RF Oscillator PWB ....................................................................................... 7-23
7-12 Ref Des Index - NAA21A/02 RF Drive Amplifier ...................................................................................... 7-26
7-13 Ref Des Index - NAS25B/03 and NAS25B/04 Power Supply Module .................................................... 7-27
7-14 Ref Des Index - NAPC26C/02 Power Supply Control PWB.................................................................... 7-27
7-15 Ref Des Index - NASC01/04 B- VDC to +24 VDC Converter ................................................................. 7-30
7-16 Ref Des Index - NAPC32A/01 and NAPC32A/02 AC Supply Monitor PWB........................................... 7-31
7-17 Ref Des Index - NAF46C/02 Harmonic Filter ........................................................................................... 7-32
7-18 Ref Des Index – NAFP23/02 RF Current Probe ...................................................................................... 7-33
7-19 Ref Des Index - NAFP24A/02 Forward/Reflected Power Probe ............................................................. 7-34
7-20 Ref Des Index - NAPC120/02 and NAPC120/04 Monitor PWB .............................................................. 7-35
7-21 Ref Des Index - NAX50B/02 Battery Control Panel ................................................................................. 7-42
8-1 Wiring Lists Provided ................................................................................................................................. 8-1
8-2 Wiring List - ND2000A Transmitter Cabinet ............................................................................................... 8-2
8-3 Wiring List – NAC111/02 Control/Monitor Panel........................................................................................ 8-7
8-4 Wiring List - NAP13B/02 Modulator/Power Amplifier Module....................................................................8-8
8-5 Wiring List - NAE45G/02 and /04 Exciter Module .................................................................................... 8-10
8-6 Wiring List - Power On/Off Panel (192-8130)........................................................................................... 8-12
8-7 Wiring List - NAS25B/03 and NAS25B/04 Power Supply Modules......................................................... 8-13
8-8 Wiring List - NASC01/04 B- VDC to +24 VDC Converter........................................................................ 8-15
8-9 Wiring List - NAF46C/02 Harmonic Filter ................................................................................................. 8-16
8-10 Wiring List - NAFP24A/02 Forward/Reflected Power Probe .................................................................. 8-17
8-11 Wiring List - NAX50B/02 Battery Control Panel ....................................................................................... 8-18
8-12 Wiring List - Interface Panel Assembly (192-8110).................................................................................. 8-20
8-13 Connector Mating Information - Sorted By Floating Connector............................................................... 8-21
9-1 List of Electrical Schematics/Logic Diagrams ............................................................................................ 9-3
10-1 List of Mechanical Drawings ..................................................................................................................... 10-2