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Nautel ND500II Technical Instructions

125 watt radiobeacon transmitter
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RADIOBEACON TRANSMITTER
(190kHz to 1250kHz and 1600 kHz to 1800 kHz)
Nautel Maine Inc.
201 Target Industrial Circle,
Bangor, Maine USA 04401
Phone: (207) 947-8200
Fax: (207) 947-3693
ISO 9002 REGISTERED
TECHNICAL INSTRUCTIONS
ND500II
125 WATT
DOUBLE SIDEBAND - NO VOICE
NAPE72 Keyer PWB
NAPC22G Monitor PWB
Original Issue ...............15 September 2003
Change 1.......................01 November 2003
Change 2......................15 September 2004
e-mail: support@nautel.com
web: www.nautel.com
© Copyright 2003 NAUTEL. All rights reserved
Nautel Limited
10089 Peggy's Cove Road,
Nova Scotia Canada B3Z 3J4
Phone: (902) 823-3900
Fax: (902) 823-3183
ISO 9001 REGISTERED

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  • Page 1 201 Target Industrial Circle, 10089 Peggy's Cove Road, Bangor, Maine USA 04401 Nova Scotia Canada B3Z 3J4 Phone: (207) 947-8200 Phone: (902) 823-3900 Fax: (207) 947-3693 Fax: (902) 823-3183 ISO 9002 REGISTERED ISO 9001 REGISTERED © Copyright 2003 NAUTEL. All rights reserved...
  • Page 3 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE 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 # 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.
  • Page 4 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE LIST OF EFFECTIVE PAGES (Continued) CHANGE CHANGE PAGE DATE PAGE DATE 15 September 2003 7-20 15 September 2003 15 September 2003 7-21 15 September 2003 15 September 2003 7-22 15 September 2003...
  • Page 5 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE LIST OF EFFECTIVE PAGES (Continued) CHANGE CHANGE PAGE DATE PAGE DATE MD-9 15 September 2003 MD-13C 01 November 2003 MD-10 15 September 2003 MD-14 01 November 2003 MD-11 15 September 2003...
  • Page 7 RADIOBEACON TRANSMITTER ND500II (125 WATT) DOUBLE SIDEBAND - NO VOICE ARTIFICIAL RESPIRATION (MOUTH-TO-MOUTH) START MOUTH-TO-MOUTH BREATHING IMMEDIATELY. SECONDS COUNT. Do not wait to loosen clothing, warm the casualty, or apply stimulants. ASSESS RESPONSIVENESS OF CASUALTY . Do not jar casualty or cause further physical injury (...
  • Page 8 RADIOBEACON TRANSMITTER ND500II (125 WATT) DOUBLE SIDEBAND - NO VOICE GENERAL RULES FOR TREATMENT FOR BURNS, BLEEDING, AND SHOCK After casualty has revived, treat for injuries and shock. Reassure casualty. Try to make him comfortable. Keep him reasonably warm but do not apply heat.
  • Page 9 RADIOBEACON TRANSMITTER ND500II (125 WATT) DOUBLE SIDEBAND - NO VOICE 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.
  • Page 10 RADIOBEACON TRANSMITTER ND500II (125 WATT) DOUBLE SIDEBAND - NO VOICE 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).
  • Page 11 Nautel for repair. The repairs will be made without charge to the Customer. 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.
  • Page 12 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.
  • Page 13 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE TABLE OF CONTENTS Section Page GENERAL INFORMATION INTRODUCTION ......................1-1 PURPOSE AND SCOPE OF MANUAL ..............1-1 PURPOSE OF EQUIPMENT ..................1-1 FACTORY REPAIR SERVICE ..................1-5 MECHANICAL DESCRIPTION ................... 1-5 1.5.1...
  • Page 14 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE TABLE OF CONTENTS (Continued) Section THEORY OF OPERATION (Continued) 2.2.6.9 Reflected Power/Refl Pwr Cal ............... 2-10 2.2.6.10 SWR Protection .................... 2-10 2.2.6.11 Battery Control ..................... 2-11 2.2.6.12 Mod% Control ....................2-11 2.2.6.13...
  • Page 15 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE TABLE OF CONTENTS (Continued) Section INSTALLATION AND PREPARATION FOR USE (Continued) 3.8.4 RF SYNTHESIZER PWER PRE-INSTALLATION ..........3-4 3.8.5 KEYER PWB PRE-INSTALLATION ..............3-5 3.8.5.1 Keyer Content Configuration ................3-5 3.8.5.2...
  • Page 16 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE TABLE OF CONTENTS (Continued) Section Page TESTING AND ADJUSTMENT GENERAL ........................5-1 OPERATION OF EQUIPMENT ................... 5-1 FUNCTIONAL TESTS/CALIBRATION PROCEDURES ..........5-1 5.3.1 FUNCTIONAL TESTS/CALIBRATION TEST EQUIPMENT ........5-1 5.3.2 FUNCTIONAL TESTS/CALIBRATION PREREQUISITES ........
  • Page 17 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE TABLE OF CONTENTS (Continued) Section MAINTENANCE GENERAL ........................6-1 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 ................
  • Page 18 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE TABLE OF CONTENTS (Continued) Section ELECTRICAL SCHEMATICS INTRODUCTION ......................9-1 COMPONENT VALUES ..................... 9-1 GRAPHIC SYMBOLS ....................9-1 LOGIC SYMBOLS ...................... 9-1 REFERENCE DESIGNATIONS .................. 9-1 IDENTIFICATION OF SCHEMATIC DIAGRAMS ............9-1 STRUCTURE OF SCHEMATICS ................
  • Page 19 Electrical Schematic - NAPS23A 24-48 VDC Power Supply PWB ........SD-10 MD-1 Assembly Detail - ND500II 125W Radiobeacon Transmitter (Front) ........MD-1 MD-2 Assembly Detail - ND500II Radiobeacon Transmitter (Rear of Front Panel) ......MD-2 MD-3 Assembly Detail - ND500II Radiobeacon Transmitter (Top) ..........MD-3 MD-4 Assembly Detail - ND500II Radiobeacon Transmitter (Bottom) ..........
  • Page 20 Reference Designation Index - NAPI64 Remote Interface PWB ..........7-32 Wiring Lists Provided ....................... 8-1 Wiring List - ND500II 125 Watt Radiobeacon Transmitter ............8-2 Wiring List - NAS26E Power Supply Assembly ................ 8-6 Wiring List - NAF107 Harmonic Filter Assembly ..............8-8 Connector Mating Information ....................
  • Page 21 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE SECTION 1 GENERAL INFORMATION INTRODUCTION PURPOSE AND SCOPE OF MANUAL The ND500II-x1x-x2x double sideband This manual provides the information (no voice) radiobeacon transmitter can operate in the necessary to install, operate and maintain the subject LF/MF band (190kHz to 650kHz) at 125 watts transmitter (see figure 1-1).
  • Page 22 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Nautel's ND family of radiobeacon transmitters are identified by a multi-part identifier. This identifier is stamped on the transmitter's nameplate and identifies a specific configuration of radiobeacon in accordance with the...
  • Page 23 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE FACTORY REPAIR SERVICE TECHNICAL SUMMARY Nautel provides a factory module repair A Technical Summary is provided at in the service for users of Nautel's transmitters. Users who specifications brochure at the front of this manual.
  • Page 24 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 1-1 Test Equipment NOMENCLATURE PART, MODEL, OR TYPE NUMBER APPLICATION (EQUIVALENTS MAY BE USED) Dummy Load Resistive 50-ohm dummy load rated at 250 Provides precise 50-ohm load Watts (twice the power rating of the...
  • Page 25 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 1-2 Glossary of Terms TERM DESCRIPTION Basic timing increment derived from master clock in keying unit. Length is dependent on frame length and number of characters used. An 8-bit frame is nominally 125 milliseconds long.
  • Page 27 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE SECTION 2 THEORY OF OPERATION GENERAL of transformer A1T1 provide tap selection to The theory of operation for the subject compensate for a low or high AC power source. Tap transmitter is presented in this section.
  • Page 28 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE 2.2.1.3 +15 Volt DC Regulator: The +15 volt 2.2.1.5 AC Monitoring: The AC monitoring DC regulator consists of +15 volt DC regulator circuit, on low voltage power supply on/off PWB...
  • Page 29 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE The secondary of transformer T1 contains two 2.2.1.6 Monitoring/Inhibit: identical windings. Each winding is connected across monitoring/inhibit circuit is comprised of transistors the gate and source of a power MOSFET (Q7/Q8).
  • Page 30 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE These coding variations are referred to as standby '1' 2.2.3.5 The watchdog circuit consists of capacitors and standby '2' and may be used to transmit C19/C20, diodes CR7/CR8 and resistor R48.
  • Page 31 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE applied through connector J1-5, resistor R43 and 2.2.4.4 PWM Ramp Integrator: The PWM ramp passed to switches U1B-5 and U1C-6. The two integrator circuit consists of operational amplifier analog switches will turn on.
  • Page 32 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE will be reverse biased for a shorter portion of the The keyed tone (audio), B+ voltage and power trim linear sawtooth waveform period. When an audio inputs are applied to analog divider U3. The output...
  • Page 33 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Figure 2-1 Simplified Schematic of PWM Differential Amplifier 2.2.4.9 Balanced Drive: The balance drive circuit If the voltage on capacitor C22 exceeds the reference is comprised of buffer amplifier U8C, transistors threshold voltage applied to the inverting input of Q6/Q7 and their associated components.
  • Page 34 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE pulse duration corresponding to the carrier level plus forward/reflected power metering circuits. tone modulation (MCW). The B+ to modulator drive assembly produces an additional unmetered +15V source voltage will also be varying at this rate and [+15V (A)], for internal use.
  • Page 35 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Capacitor C33 filters out the modulation component 2.2.6.3 Monitor's +15V (A) Supply: The B+ of the RF carrier and charges to the mean DC level voltage is applied through J3-1, resistors R1/R4 and which is representative of the RF carrier level.
  • Page 36 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE consisting of diode CR8 and capacitor C12. The 2.2.6.7 Shutdown Control: The shutdown control detected signal is passed across loading resistor R53 circuit is comprised of operational amplifier U4B, and a limiting circuit consisting of diode CR9 and...
  • Page 37 J3-2 and applied to a linear attenuator be in-circuit (shorting jumper E1 installed to short circuit within the mod driver PWB. When the output pins 1 and 2) when a Nautel remote control unit is on U9B-7 is high, the input to comparator U9A's not used.
  • Page 38 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE the mod % line (J3-6). For 100% adjustment on the circuitry in the monitor PWB A5. test meter, the test switch on the front panel is set to 2.2.7.2 Forward/Reflected Power Probe: The...
  • Page 39 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE A 24V supply is applied to the drain of switching 2.2.7.5 Depending upon the length of the feeder FETs Q1 and Q2 through inductor L2. The gate of cable, the impedance at the sideband frequencies may...
  • Page 41 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE STANDBY TRANSMITTER (OPTIONAL) KEYER MODULATOR DRIVER STANDBY CODE TIMING CODE PA/MODULATOR OSCILLATOR GENERATOR MODE KEYING SELECTOR EMISSION PULSE GATE MODE WIDTH MODULATOR SELECTOR GENERATOR DRIVE TONE KEYED OSCILLATOR TONE OSCILLATOR/RF DRIVER...
  • Page 43 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE SECTION 3 INSTALLATION AND PREPARATION FOR USE GENERAL 250 volts RMS for 230 volt AC power sources, This section contains the information provided the mean voltage does not vary by more required to prepare the equipment site to receive the than ten percent.
  • Page 44 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE 3.3.6 CONTROL/MONITOR CABLING: 3.3.8.2 High SWR Alarm: A 'remote SWR Control and monitoring connections are made to alarm' output is available at TB1-18 or J4-18 of terminal block TB1 on the remote interface PWB remote interface PWB A11.
  • Page 45 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE PARTS REQUIRED BUT NOT SUPPLIED Remove the two wooden braces securing the transmitter carefully remove Some parts required to complete the transmitter. installation of the subject transmitter are not supplied with the transmitter.
  • Page 46 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 3-1 Power Transformer A1T1 - Secondary Winding Tap Selection 115 VOLT VERSION 230 VOLT VERSION AC VOLTAGE CONNECT CONNECT AC VOLTAGE CONNECT CONNECT (RMS) A1U1-1 TO A1U1-2 TO (RMS)
  • Page 47 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE 3.8.5 KEYER PWB PRE-INSTALLATION: (Transport Canada) uses a 10-second TRAN Complete the pre-installation procedures on keyer frame and 0.125ms bits to key out 3 symbols. PWB A3 as follows (refer to figure MD-3 to locate...
  • Page 48 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE 3.8.5.2 Keyed Tone Frequency: If the keyed tone Connect A7TB4-1 to terminals of terminal frequency is to be 1020Hz, as determined in block A7TB4 identified in step (a) using paragraph 3.6.2, install shorting jumpers E1 and E2 appropriate metal links or jumper wires.
  • Page 49 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 3-2 Selecting Frequency Band Links in Harmonic Filter A7 CARRIER CONNECT CONNECT CONNECT CONNECT FREQUENCY (kHz) A7TB1-4 TO A7TB2-6 TO A7TB3-6 TO A7TB4-1 TO 190 to 210 A7TB1-1 A7TB2-2/3/4 and 5...
  • Page 50 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Using figure 3-2 to determine the final If the transmitter is configured to operate from destination of each conductor, cut each 230 volts AC; remove the 15 ampere, 115 volt...
  • Page 51 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE 3.10.2 The second stage consists of a complete and to calibrate the antenna tuning unit in accordance calibration and tuning of the antenna system's tuned with its instruction manual. The transmitter is used...
  • Page 52 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Calibrate or verify antenna tuning unit is completion antenna tuning unit calibrated (by personnel at antenna tuning unit calibration, set switch S6 to TEST REFL PWR site) in accordance with instructions in the ATU and verify the reflected power indication on instruction manual.
  • Page 53 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE NOTE If the external remote power trim feature is not used, set jumper (E1) to disable (position). RMT PWR TRIM DSBL If transmitter's +15 VDC is used as voltage source for external...
  • Page 54 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE THIRD STAGE (INITIAL START-UP) 3.13.2 INTENDED MODULATION DEPTH: 3.13 The third state of initial start-up is to Monitor the RF output waveform at RF MON operate a transmitter that has met the requirements of...
  • Page 55 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE SECTION 4 OPERATING INSTRUCTIONS GENERAL 4.3.4 MONITOR PWB CONTROLS AND This section provides the information INDICATORS: Figure MD-3 depicts the location of required to place the transmitter in operation. monitor PWB A5 and figure MD-10 depicts the Normally, the transmitter will not be attended during location of its controls and indicators.
  • Page 56 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE PRE-START-UP CHECKS RESETTING TRANSMITTERS 4.4 Prior to applying AC or DC power to the Transmitters that have transferred to transmitter, observe the following: 'shutdown' may be reset by momentarily switching the transmitter 'off' and back to 'on'.
  • Page 57 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 4-1 Preliminary Switch Settings NOMENCLATURE INITIAL CALIBRATION OPERATING USED IN TEXT SETTING SETTING SETTING KEYING OFF ON POWER CONTROL LOCAL LOCAL User Determined MONITOR BYPASS BYPASS NORMAL TEST B+ VOLTS B+ VOLTS 4.7.1.2...
  • Page 58 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 4-2 Front Panel Controls and Indicators PANEL MARKING/ NOMENCLATURE FUNCTION USED IN TEXT MD-1 REMOTE CONTROL Indicates switch S4 is set to CONTROL REMOTE control of the on/off function has been extended to a remote location when on.
  • Page 59 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 4-2 Front Panel Controls and Indicators (Continued) PANEL MARKING/ NOMENCLATURE FUNCTION USED IN TEXT MD-1 AC POWER Fuses line of AC power source at 4.0 (230 VAC) amperes or 7.0 (115 VAC).
  • Page 60 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 4-2 Front Panel Controls and Indicators (Continued) PANEL MARKING/ NOMENCLATURE FUNCTION USED IN TEXT MD-1 MONITOR Inhibits shutdown circuit and prevents undesired shutdown during calibration/test procedures when set . Shutdown circuit acts normally when set...
  • Page 61 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 4-3 Keyer PWB (A3) Controls and Indicators PANEL MARKING/ NOMENCLATURE FUNCTION USED IN TEXT MD-8 KEYER FAULT Indicates a problem has occurred with one or both EEPROMs on the keyer PWB. Action taken on the transmitter is dependent on the setting of the jumper (E4).
  • Page 62 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 4-4 Modulator Driver PWB (A4) Controls PANEL MARKING/ NOMENCLATURE FUNCTION USED IN TEXT MD-9 PWM Freq Adjusted to fine tune the PWM square wave generator's output to 70kHz. MD-9...
  • Page 63 Installed to short pins 1 and 2 when a Nautel remote control unit is not used. Installed to short pins 2 and 3 when a Nautel remote control unit is used.
  • Page 64 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 4-5 Monitor PWB (A5) Controls and Indicators (Continued) PANEL MARKING/ NOMENCLATURE FUNCTION USED IN TEXT MD-10 FWD PWR Adjusted, during calibration procedures, to precisely set the forward power indication on...
  • Page 65 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 4-6 Harmonic Filter (A7) Controls PANEL MARKING/ NOMENCLATURE FUNCTION USED IN TEXT MD-12 RF MON Determines the source of the RF output waveform for meter M1’s modulation readings and for the...
  • Page 66 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 4-7 RF Synthesizer PWB (A9) Controls PANEL MARKING/ NOMENCLATURE FUNCTION USED IN TEXT MD-3 ♦ E1/E2/E4 RF Drive Internal/External Shunt posts that select the source of the RF drive signal.
  • Page 67 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 4-8 24-48 VDC Power Supply PWB (A10) (Optional) Controls and Indicators PANEL MARKING/ NOMENCLATURE FUNCTION USED IN TEXT MD-15 +15V When turned on (green), indicates an external +24 VDC battery source is being applied and +15V is being applied to the PWB’s control IC.
  • Page 68 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 4-9 Low Voltage Supply On/Off PWB (A1A1) Controls PANEL MARKING/ NOMENCLATURE FUNCTION USED IN TEXT MD-6 Low AC Inhibit Shunt post that is installed depending on the power source(s) being applied to the transmitter.
  • Page 69 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 4-10 Remote Interface PWB (A11) Controls PANEL MARKING/ NOMENCLATURE FUNCTION USED IN TEXT MD-16 Rmt Pwr Trim Shunt post that is enable or disables the ability to remotely control the power trim circuitry.
  • Page 71 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE SECTION 5 TESTING AND ADJUSTMENTS GENERAL not been established, set it to the maximum achievable percentage without causing clipping and This section contains calibration distortion. procedures that are performed in conjunction with functional tests.
  • Page 72 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE A precision, resistive, 50-ohm dummy load that Verify the pre-installation requirements for is rated at a minimum of 250 watts and has keyer PWB A3 have been completed, as provision to accurately display the RF power detailed in paragraph 3.8.5.
  • Page 73 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Connect the transmitter's RF output to a Record difference between meter M1 TEST precision, 50-ohm, resistive dummy load that reading obtained in step (d) and digital has provision to accurately display the RF...
  • Page 74 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Record difference between meter M1 5.3.3 CARRIER FREQUENCY/RF DRIVE TEST reading obtained in step (d) and digital LEVEL AND ALARM CHECKS: Verify the voltmeter reading obtained in step (b) as...
  • Page 75 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Disconnect test leads of variable DC power clockwise. supply. Connect a shorting jumper across resistor A4R27. (m) Install the shunt post on position ‘A’ of header E5 on the RF synthesizer PWB A9.
  • Page 76 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Connect RF drive to power amplifier/modulator Set all switches, except switch S6, to TEST A6 by connecting connector P11 to its mating positions tabulated for Calibration Setting in connector (A6J2).
  • Page 77 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Oscilloscope waveform shall be similar to the Oscilloscope indication shall be similar to the unmodulated RF output waveform depicted in tone modulated RF output waveform depicted example 'N' of figure 6-1. The peak-to-peak in example 'M' of figure 6-1.
  • Page 78 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Verify speaker audio is available and can be Using a stopwatch, measure and record the time adjusted to the desired level, by adjusting from the start of the code of one frame to the potentiometer R1.
  • Page 79 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE NOTE 5.3.8 SHUTDOWN CHECK: Verify carrier level/modulation depth fault thresholds are set to the The 'intended' carrier level is the RF carrier output levels that will cause transmitter to shut down when...
  • Page 80 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Verify requirements of paragraph 5.3.8.1 have Determine the 'maximum' acceptable RF carrier been completed. level, normally +2.0dB, before the transmitter shuts down and record this level, in watts, as Determine the 'minimum' acceptable RF carrier the 'High Carrier Level Fault Threshold' in level, normally -3.0dB, before the transmitter...
  • Page 81 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE NOTE Determine the time required to monitor two full If difference between 'intended' modulation depth eight-second keyer frames that contain and 'minimum' modulation depth is specified in dBs, identification code (refer to paragraph 3.8.4.2).
  • Page 82 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE (m) Repeat steps (c) through (l) until shutdown Digital multimeter indication shall be infinite delay period requirements in step (h) are met impedance (open circuit). without further adjustment DELAY potentiometer A5R41.
  • Page 83 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Restore forward and reflected outputs of Adjust potentiometer A4R2 clockwise MOD % harmonic filter A7 to their normal destinations, for a modulation depth of 100 percent, as as follows: indicated by oscilloscope waveform.
  • Page 84 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Set 'remote on/off' switch to on. After a nominal five second delay, meter TEST M1's forward power indication shall return to lamp DS1 shall turn on. normal. REMOTE CONTROL After a nominal five second delay, meter 5.3.11.3 Remote Power Trim: The remote power...
  • Page 85 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Verify a ground is present on A11TB1-19, potentiometer A4R31, on ' output. modulator driver PWB, fully counter REMOTE BATTERY STATUS clockwise. Verify transmitter resumed normal operation while being supplied from the DC...
  • Page 86 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE 5.4.2 LOW VOLTAGE POWER SUPPLY ON/OFF PWB AC MONITOR CALIBRATION: 5.5.1 OPERATIONAL ADJUSTMENT Calibrate the threshold of the AC monitor circuitry as TEST EQUIPMENT: The following test equipment follows: is required for operational adjustment procedures (see table 1-3 for more detailed specifications): Verify the requirements of paragraphs 5.3.2...
  • Page 87 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE potentiometer A4R2 fully counter 5.5.5 MODULATION DEPTH (MCW MOD % clockwise. TONE ONLY) ADJUSTMENT: modulation percentage to the 'intended' modulation 5.5.3 TRANSMITTER TURN-ON: Apply depth, as follows: main power to the transmitter and verify the indicator...
  • Page 88 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE 5.5.6 POST-OPERATIONAL ADJUSTMENT PROCEDURES: When operational adjustment procedures have been successfully completed, set all switches to the setting tabulated for Operating Setting in table 4-1. Page 5-18 15 September 2003...
  • Page 89 RADIOBEACON TRANSMITTER ND500 II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 5-1 dB to Power/Voltage Conversion VOLTAGE POWER VOLTAGE POWER VOLTAGE POWER 1.0000 1.0000 0.6310 0.3981 0.3981 0.1585 0.9886 0.9772 0.6237 0.3890 0.3936 0.1549 0.9772 0.9550 0.6166 0.3802 0.3890 0.1514 0.9661 0.9333...
  • Page 90 RADIOBEACON TRANSMITTER ND500 II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 5-2 Functional Test Check List ESTABLISHED REFERENCES VOLT READING B+ VOLTS______VDC 24 VOLTS______VDC +15 VOLTS______VDC CORRECTION FACTORS: Carrier Frequency ......__________kHz Modulation Frequency ....... __________Hz Intended Carrier Level ...._________Watts Intended Modulation Depth ....
  • Page 91 RADIOBEACON TRANSMITTER ND500 II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 5-2 Functional Test Check List (Continued) PARA FUNCTION OBSERVED TEST RESULTS TOLERANCES Accept ¨ Reject ¨ 5.3.6 RF monitor (no mod) Unmodulated RF waveform Accept ¨ Reject ¨ RF monitor (100% mod) Undistorted, 100% modulated RF waveform at ground.
  • Page 93 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE SECTION 6 MAINTENANCE GENERAL 6.2.3 LOGIC SYMBOLS: The logic symbols This section contains scheduled and used on electrical schematics and logic diagrams are corrective maintenance information for the subject in accordance with American National Standard transmitter.
  • Page 94 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Measure source/drain resistance, of power ISOLATION DEFECTIVE POWER MOSFET being tested, in both directions. MOSFETS Isolate defective power MOSFET devices Resistance measurements in step (g) shall be a in the NAA18 modulator/power amplifier, using a short circuit in forward and reverse directions.
  • Page 95 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE NOTE NOTE It is not necessary to remove the adapter PWB or its Q1 has a 0.187 spacer, which is installed between attaching hardware when replacing a power the PWB and a terminal lug, on the nut side.
  • Page 96 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE CARRIER OSCILLATOR FREQUENCY - Test Point A9R28 (RHS) CW - Connector P11 connected, frequency 2240 kHz BALANCED DRIVE OUTPUT - Test Point A9TP7 CW - Connector P11 connected, frequency 535 kHz...
  • Page 97 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE RF DRIVE OUTPUT - Test Point A2TP4 Connector P11 connected, frequency 535 kHz, B+ 62 volts RF DRIVE OUTPUT - Test Point A2TP4 Connector P11 connected, frequency 1800 kHz, B+ 62 volts...
  • Page 98 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE KEYER TIMING OSCILLATOR (CW) - Test Point A3TP1 TONE OSCILLATOR - Test Point A3TP2 CW - Connector P3 connected Figure 6-1 Waveforms - Off Air Troubleshooting (Sheet 3) Page 6-6...
  • Page 99 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE AUDIO/KEYED TONE (MCW) - Test Point A4TP1 95% Modulation PWM RAMP INTEGRATOR OUTPUT (CW) - Test Point A4TP3 Figure 6-1 Waveforms - Off Air Troubleshooting (Sheet 4) Page 6-7 15 September 2003...
  • Page 100 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE MOD DRIVE (PWM OUTPUT) (CW) - 125 Watts - Test Point A4TP4 FWD POWER SAMPLE - Test Point A5TP1 125 Watts, MCW - 95% Modulation Figure 6-1 Waveforms - Off Air Troubleshooting (Sheet 5)
  • Page 101 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE KEYING GATE/FWD POWER SAMPLE - Test Point A5TP2 125 Watts, 95% Modulation (M) RF MONITOR - J1 (Front Panel) 125 Watts - 95% Modulation ( switch to set to RF MON...
  • Page 102 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE RF MONITOR - J1 (Front Panel) CW - 125 Watts( switch to set to RF MON VOLT Figure 6-1 Waveforms - Off Air Troubleshooting (Sheet 7) Page 6-10 15 September 2003...
  • Page 103 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE SECTION 7 PARTS LIST INTRODUCTION 7.4.2 WHEN FULL REFERENCE This section contains reference designation DESIGNATION KNOWN: Locate indexes that provide descriptive and provisioning information for a part when the full reference...
  • Page 104 The use of this number does not restrict Nautel from selecting and using commercial equivalents, where 7.6.2 REF DES COLUMN: This column their use will not degrade circuit operation or contains the reference designation for a specific part.
  • Page 105 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-1 Manufacturers' Code to Address Index 00779 Amp Incorporated, 13150 Vernitron Electronic Components, 2800 Fulling Mill, Beau Products Division, PO Box 3608, PO Box 10, Harrisburg, Pennsylvania 17105 Laconia, New Hampshire 03246...
  • Page 106 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-1 Manufacturers' Code to Address Index (Continued) 37903 Siemens Electric Ltd., 72982 Erie Technological Products Inc, 7300 Trans Canada Highway, 644 West 12th Street, Pointe Clare, Quebec, Canada Erie, Pennsylvania 16512...
  • Page 107 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-1 Manufacturers' Code to Address Index (Continued) 83003 VARO Incorporated, 91637 Dale Electronics Incorporated, PO Box 401426, PO Box 609, 2203 Walnut Street, 2064 12th Avenue, Garland, Texas 75040...
  • Page 108 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Figure 7-1 Family Tree - ND500II Radiobeacon Transmitter Page 7-6 01 November 2003...
  • Page 109 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-2 Reference Designation Index - ND500II Radiobeacon Transmitter NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE Transmitter, Radiobeacon, DSB, 125 Watts ND500II (see Fig. 1-1) NARB09/01...
  • Page 110 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-2 Reference Designation Index - ND500II Radiobeacon Transmitter (Continued) NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE Fuse, 2A, 250V, Slow, 3AG FA11 313002 75915 Fuse, 0.75A, 250V, Slow, 3AG...
  • Page 111 Denotes used when basic nomenclature has no alpha suffix (NARB09/01 through /04). Denotes used when basic nomenclature has an ‘A’ suffix (NARB09A/01 through /08). Refer to figure 1-1 of this manual for an explanation Nautel's ND500II-xxx-xxx suffix identification. Page 7-9...
  • Page 112 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-3 Reference Designation Index - NAS26 Power Supply NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE Power Supply Assembly, 115 VAC, 60Hz NAS26E/01 158-1025-22...
  • Page 113 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-4 Reference Designation Index - NAPC34 Low Voltage Supply On/Off PWB NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE Low Voltage Supply On/Off PWB...
  • Page 114 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-5 Reference Designation Index - NAPE33 Oscillator/RF Driver PWB NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE Oscillator/RF Driver PWB NAPE33/01A 158-1013-02 37338 Oscillator/RF Driver PWB...
  • Page 115 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-5 Reference Designation Index - NAPE33 Oscillator/RF Driver PWB (Continued) NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE Resistor, Metal Film, 150 Ohms, 5% 2W...
  • Page 116 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-6 Reference Designation Index – NAPE72 Keyer PWB NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE Keyer PWB NAPE72 158-3000 37338 Capacitor, Ceramic, 0.1uF 10%100V...
  • Page 117 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-6 Reference Designation Index - NAPE72 Keyer PWB (Continued) NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE Transistor, PNP, Switch/Amplifier QA44 2N4403 04713 Transistor, NPN, Switch/Amplifier...
  • Page 118 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-6 Reference Designation Index - NAPE72 Keyer PWB (Continued) NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE Resistor, Metal Film, 10.0K Ohms, 1%1/4W RAB37...
  • Page 119 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-7 Reference Designation Index - NAPE32B/01A Modulator Driver PWB NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE Modulator Driver PWB NAPE32B/01A 158-1017-04 37338 Capacitor, Tantalum, 6.8uF 10% 35V...
  • Page 120 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-7 Reference Designation Index - NAPE32B/01A Modulator Driver PWB (Continued) NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE Transistor, NPN, Switch QN26 2N2369A 04713...
  • Page 121 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-7 Reference Designation Index - NAPE32B/01A Modulator Driver PWB (Continued) NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE Resistor, Metal Film, 33K Ohms, 2% 1/2W...
  • Page 122 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-8 Reference Designation Index - NAPC22G Monitor PWB NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE Monitor PWB NAPC22G 158-1015-10 37338 Capacitor, Tantalum, 6.8uF 10% 35V...
  • Page 123 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-8 Reference Designation Index - NAPC22G Monitor PWB (Continued) NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE CR12 Not Used CR13 Diode, General Purpose, 200V, 0.1A...
  • Page 124 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-8 Reference Designation Index - NAPC22G Monitor PWB (Continued) NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE Resistor, Metal Film, 47.5K Ohms, 1%1/4W RAB45...
  • Page 125 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-8 Reference Designation Index - NAPC22G Monitor PWB (Continued) NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE Resistor, Metal Film, 18.2K Ohms, 1%1/4W RAB40...
  • Page 126 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-8 Reference Designation Index - NAPC22G Monitor PWB (Continued) NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE Socket, IC, 16-pin UC03 2-641262-1 00779 Socket, IC, 8-pin...
  • Page 127 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-9 Reference Designation Index - NAA18 Modulator/Power Amplifier Assembly NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE PA/Modulator NAA18D 158-1011-04 37338 Capacitor, Plastic, 1.8uF 10% 250V...
  • Page 128 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-10A Reference Designation Index - NAF107/01 and NAF107/02 Harmonic Filter (190-650kHz) NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE ♦ * Harmonic Filter NAF107/01A...
  • Page 129 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-10A Reference Designation Index - NAF107/01 and NAF107/02 Harmonic Filter (Continued) NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE ♦ Not Used ♥ Connector, Coaxial, Type N, 50 Ohm...
  • Page 130 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-10B Reference Designation Index - NAF107/03 and NAF107/04 Harmonic Filter (651-1250kHz, 1600-1800kHz) NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE ♦ * Harmonic Filter...
  • Page 131 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-10B Reference Designation Index - NAF107/03 and NAF107/04 Harmonic Filter (Continued) NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE ♦ Not Used ♥ Diode, General Purpose, 200V, 0.1A...
  • Page 132 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-11 Reference Designation Index – NAPS23A 24-48 VDC Power Supply PWB (Optional) NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE 24-48 VDC Power Supply PWB...
  • Page 133 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-11 Reference Designation Index – NAPS23A 24-48 VDC Power Supply PWB (Optional) (Continued) NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE Resistor, Metal Film, 475 Ohms, 1%, 1/4W...
  • Page 134 RADIOBEACON TRANSMITTER ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE Table 7-12 Reference Designation Index – NAPI64 Remote Interface PWB NAME OF PART NAUTEL'S JAN/MIL/OEM CODE AND DESCRIPTION PART NO. PART NO. CODE Remote Interface PWB NAPI64 158-4000 37338 Connector, Post Shunt, 2 Pos, .10 Centreline JQ15...

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