TECHNICAL MANUAL OPERATOR S ORGANIZATIONAL, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST FOR

Transcription

1 ARMY TM &P AIR FORCE TO 33A TECHNICAL MANUAL OPERATOR S ORGANIZATIONAL, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST FOR ELECTROMAGNETIC INTERFERENCE/ FIELD INTENSITY METER NM (NSN ) DEPARTMENTS OF THE ARMY AND AIR FORCE 17 SEPTEMBER 1984

2 This manual contains copyrighted material reproduced by permission of the SINGER Company. AZZ rights reserved. TECHNICAL MANUAL TM &P NO &P TO 33A DEPARTMENTS OF THE ARMY AND TECHNICAL ORDER AIR FORCE NO. 33A Washington, DC, 17 September 1984 OPERATOR S, ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS FOR ELECTROMAGNETIC INTERFERENCE FIELD INTENSITY METER NM-37/57 (NSN ) REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS You can help improve this manual. If you find any mistakes or if you know of a way to improve the procedures, please let us know. Mail your letter, DA Form 2028 (Recommended Changes to Publications and Blank Forms), or DA Form located in back of this manual direct to: Commander, US Army Communications-Electronics Command and Fort Monmouth, ATTN: AMSEL-ME-MP, Fort Monmouth, New Jersey For Air Force, submit AFTO Form 22 (Technical Order System Publication Improvement Report and Reply) in accordance with paragraph 6-5, Section VI, T.O Forward direct to prime ALC/MST. In either case, a reply will be furnished direct to you. This manual is an authentication of the manufacturer s commercial literature which, through usage, has been found to cover the data required to operate and maintain this equipment. The manual was not prepared in accordance with MIL-M-38784A; therefore, the format has not been structured to consider categories of maintenance. i

3 TABLE OF CONTENTS 0 INTRODUCTION Scope of Manual Consolidated Index of Army Publications and Blank Forms Maintenance Forms, Records, and Reports Reporting Equipment Improvement Recommendations (EIR) Administrative Storage Destruction of Army Electronics Materiel Equipment Differences During Production INTRODUCTION Purpose and Use of Equipment General Description Programmable Functions Specifications Supplied Accessories Optional Accessories Unpacking and Inspection Storage and Shipment Storage Packaging OPERATING INSTRUCTIONS General Preparation for Use 2-1 ii

4 2.2.1 Bench Operation Rack Mounting Operating Controls, Indicators, and Receptacles Programmable Functions Frequency Band Selection Bandwidth Selection Frequency Tuning Receiver Gain (Calibrate) Detector Function Selection Programmer Receptacle Pin Data Preliminary Operating Procedures Operation From an AC Power Source Operation From Internal Batteries Battery Charging Basic Operating Techniques Signal Pickup Devices Biconical Antenna, Model Conical Log Spiral Antenna, Model Loop Antenna, Model RF Current Probe, Model RF Probe Cable, Model Maximum Safe Input Levels 2-16 III

5 2.9 Gain Calibration Narrowband Signal Measurements Selection of Bandwidth Field Intensity (Average Value) Measurements Quasi-Peak Measurements Direct Peak Measurements Slideback Peak Measurements Broadband Signal Measurements Selection of Bandwidth Direct Peak Measurements Quasi-Peak Measurements Slideback Peak Measurements Signal Type Determination Signal Level Calculations Calculation of Conducted NB Interference (50 Ohm Direct Connection Calculation of Radiated NB Interference Calculation of Conducted NB Interference Measured with RF Current Probe Calculation of Conducted NB Interference (50 Ohm Direct Connection Calculation of Radiated BB Interference 2-29 iv

6 Calculation of Conducted BB Interference Measured with RF Current Probe Calculation of Conducted Signal Levels in Picowatts Operation With X-Y Recorder Operation With External Scan Input 2-33/ THEORY OF OPERATION RF Circuits Turret Attenuator Switch Assembly A Calibration Switch A Impulse Calibrator A Position RF Switch A Tuners Al Through A Tuning Control Circuits Band Selector A Tuning Control A Shapes A26 and A Frequency Meter A Internal Sweep A Frequency Readout A IF Circuits Position and 3-Position IF Switch All /20.5 MHz IF Converter A v

7 MHz IF Preamplifier A Voltage Controlled Attenuator A Bandwidth Selector A Linear IF Amplifier and BFO A Logarithmic IF Amplifier A Detection and Display Circuits FM Discriminator A Slideback Peak Circuit A Weighting and Meter Amplifier A Direct Peak Circuit A DB Readout and Audio Amplifier A DB Meter A Remote Function Selector A Power Supply Power Transformer A Rectifier-Charger Regulator A Voltage Regulator A DC/DC Converter A Battery Assembly A MAINTENANCE Introduction Minimum Performance Test Procedures Test Equipment Required 4-2 vi

8 4.2.2 Initial Control Settings Disassembly Procedures Removal of Cover Panels Removal of Battery Pack Removal of Subassemblies Maintenance and Alignment of Power Supply Section Check and Alignment of Recifier- Charge Regulator A Battery Maintenance Alignment of Voltage Regulator A Adjustment and Maintenance of DC/DC Converter A Maintenance and Alignment of Video Section Preliminary Procedures Check and Alignment of Direct Peak Circuit A Check and Alignment of Slideback Peak Circuit A Alignment of Weighting and Meter Amplifier A Alignment of Remote Function Selector A Alignment of DB Readout and Audio Amplifier A24 on Serial Number 205 and Below Alignment of DB Readout and Audio Amplifier A24 on Serial Number 206 and Above 4-31 VII

9 4.6 Maintenance and Alignment of IF Section Alignment and Test of Log IF Amplifier A Alignment and Test of Linear IF Amplifier and BFO A Alignment and Test of FM Discriminator A Alignment and Test of Bandwidth Selector A Maintenance of Voltage Controlled IF Attenuator A Alignment and Test of IF Preamplifier A Alignment and Test of IF Converter A Maintenance and Alignment of Tuning Control Section Alignment and Test of Tuning Control Alignment and Test of Shaper 1, A Alignment and Test of Shaper 2, A Alignment and Test of Internal Sweep A Alignment and Test of Frequency Readout A Maintenance and Alignment of RF Section Alignment of Tuner, 1 Al Alignment of Tuners 2 and 3, A2 and A Alignment of Tuner 4, A VIII

10 4.8.4 Alignment of Tuners 5-8, A5-A Test and Alignment of Impulse Calibrator A Determination of Calibration Figures for All Frequency Bands SCHEMATIC DIAGRAMS PARTS LIST Singer Parts List Part Number-National Stock Number Cross Reference Index 6-55 APPENDIX A. REFERENCES A-1 B. BATTERY SUPPLEMENTARY INFORMATION B-1/B-4 C. MAINTENANCE ALLOCATION C-1 TABLE 1-1 Specifications Supplied Accessories Optional Accessories Front Panel Features Rear Panel Features PROGRAMMER Receptacle Pin Data Maximum Safe Input Levels Conversion of Units Minimum Performance Test Procedures 4-3 IX

11 ILLUSTRATIONS FIGURE 0-1 Electromagnetic Interference/Field Intensity Meter Model NM-37/ Optional Accessories Front Panel Features Rear Panel Features Remote Frequency Band Selection, Functional Schematic Diagram Remote Bandwidth Selection, Functional Schematic Diagram Remote Frequency Tuning, Functional Schematic Diagram Remote Receiver Gain, Functional Schematic Diagram Remote Function Selection, Functional Schematic Diagram Calibration Chart Signal Power Conversion Chart (Picowatts- Microvolts) Simplified Block Diagram, Model NM-37/ Test Equipment Setup for Video Section Alignment Test Equipment Setup for Linear IF Amplifier Test and Alignment Test Equipment Setup for FM Discriminator Alignment Test Equipment Setup for Bandwidth Selector Gain Adjustment Test Equipment Setup for Bandwidth Selector Aligment and Bandwidth Test 4-44 X

12 ILLUSTRATIONS FIGURE 4-6 Test Equipment Setup for Voltage Controlled IF Attenuator CW Signal Tracking Test Test Equipment Setup for Local Oscillator Frequency Alignment of Tuners Test Equipment Setup for RF Alignment of Tuners Impulse Calibrator Waveforms Tuner 1 (Al), Schematic Diagram Tuner 2 (A2), Schematic Diagram Tuner 3 (A3), Schematic Diagram Tuner 3 (A3), Schematic Diagram Serial Number 455 and Above Tuner 4 (A4), Schematic Diagram Tuner 5 (A5), Schematic Diagram Tuner 6 (AS), Schematic Diagram Tuner 7 (A7), Schematic Diagram Tuner 8 (AS), Schematic Diagram Impulse Calibrator (A9), Schematic Diagram Position RF Switch (A10), Schematic Diagram Position and 3-Position IF Switch (All) Schematic Diagram /20.5 MHz IF Converter (A12), Schematic Diagram /20.5 MHz IF Converter (A12), Schematic Diagram Serial Number 431 and Above 5-15 XI

13 FIGURE ILLUSTRATIONS MHz IF Preamplifier (A13), Schematic Diagram Bandwidth Selector (A14), Schematic Diagram Linear IF Amplifier and BFO (A15), Schematic Diagram DC/DC Converter (A1S), Schematic Diagram Position RF Switch (A17), Schematic Diagram FM Discriminator (A18), Schematic Diagram Weighting and Meter Amplifier (A21), Schematic Diagram Direct Peak Circuit (A22), Schematic Diagram Slideback Peak Circuit (A23), Schematic Diagram DB Readout and Audio Amplifier (A24), Schematic Diagram Remote Function Selector (A25), Schematic Diagram Shaper 1 (A26), Schematic Diagram Shaper 2 (A27), Schematic Diagram Tuning Control (A29), Schematic Diagram Band Selector (A30), Schematic Diagram Band Selector (A30), Schematic Diagram Serial Number 602 and Above Voltage Regulator (A31), Schematic Diagram Rectifier - Charger Regulator (A32), Schematic Diagram 5-33 XII

14 ILLUSTRATIONS FIGURE 5-30 Internal Sweep (A33), Schematic Diagram Frequency Readout (A34), Schematic Diagram Log Amplifier (A41), Schematic Diagram Voltage Controlled IF Attenuator (A48), Schematic Diagram Cabling Diagram, NM-37/ Wiring Diagram, NM-37/ Location of Main Assemblies (Top View) Location of Main Assemblies (Bottom View) 6-3 XIII/(XIV blank)

15 SCOPE OF MANUAL INTRODUCTION This manual provides operation and maintenance information for the Model NM-37/57 Electromagnetic Interference/Field Intensity Meter (figure 0-1). The manual is divided into six sections containing a general description of the equipment and accessories, operating instructions and procedures, theory of operation, maintenance instructions, schematic diagrams, a repair parts list, part number, national stock number cross reference index, and a maintenance allocation chart (MAC) CONSOLIDATED INDEX OF ARMY PUBLICATIONS AND BLANK FORMS Refer to the latest issue of DA Pam to determine whether there are new editions, changes, or additional publications pertaining to the equipment MAINTENANCE FORMS, RECORDS, AND REPORTS a. Reports of Maintenance and Unsatisfactory Equipment. Department of the Army forms and procedures used for equipment maintenance will be those prescribed by DA Pam , The Army Maintenance Management System (TAMMS). Air Force personnel will use AFR 66-1 for maintenance reporting and TO-00-35D54 for unsatisfactory equipment reporting. 0-1