Naval Education - Magnetic Recording

NONRESIDENTTRAININGCOURSESEPTEMBER 1998Navy Electricity andElectronics Training SeriesModule 23Magnetic RecordingNAVEDTRA 14195DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.Although the words he, him, andhis are used sparingly in this course toenhancecommunication,theyarenotintended to be gender driven or to affront ordiscriminate against anyone.DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.PREFACE By enrolling in this self-study course, you have demonstrated a desire to improve yourself and the Navy. Remember, however, this self-study course is only one part of the total Navy training program. Practical experience, schools, selected reading, and your desire to succeed are also necessary to successfully round out a fully meaningful training program. COURSE OVERVIEW: To introduce the student to the subject of Magnetic Recording who needs such a background in accomplishing daily work and/or in preparing for further study. THE COURSE: This self-study course is organized into subject matter areas, each containing learning objectives to help you determine what you should learn along with text and illustrations to help you understand the information. The subject matter reflects day-to-day requirements and experiences of personnel in the rating or skill area.

It also reflects guidance provided by Enlisted Community Managers (ECMs) and other senior personnel, technical references, instructions, etc., and either the occupational or naval standards, which are listed in the Manual of Navy Enlisted Manpower Personnel Classificationsand Occupational Standards, NAVPERS 18068. THE QUESTIONS: The questions that appear in this course are designed to help you understand the material in the text. VALUE: In completing this course, you will improve your military and professional knowledge. Importantly, it can also help you study for the Navy-wide advancement in rate examination. If you are studying and discover a reference in the text to another publication for further information, look it up. 1998 Edition Prepared byCTMC(SS) Milton Charles Georgo Published by NAVAL EDUCATION AND TRAINING PROFESSIONAL DEVELOPMENT AND TECHNOLOGY CENTER NAVSUP Logistics Tracking Number0504-LP-026-8460 i Sailors Creed I am a United States Sailor.

I will support and defend the Constitution of the United States of America and I will obey the orders of those appointed over me. I represent the fighting spirit of the Navy and those who have gone before me to defend freedom and democracy around the world. I proudly serve my countrys Navy combat team with honor, courage and commitment. I am committed to excellence and the fair treatment of all. ii TABLE OF CONTENTS

Introduction to Magnetic Recording......................................................................... 2-1 Magnetic Tape Recorder Heads ............................................................................... 3-1 Magnetic Tape Recorder Transports ........................................................................ 4-1 Magnetic Tape Recorder Record and Reproduce Electronics .................................. 5-1 Magnetic Tape Recorder Specifications................................................................... 6-1 Digital Magnetic Tape Recording ............................................................................ 7-1 Magnetic Disk Recording......................................................................................... 8-1 APPENDIX I. 8-1 APPENDIX I.

Glossary.................................................................................................................. AI-1 II. References .............................................................................................................. AII-1 INDEX ...................................................................................................................... INDEX-1 iii CREDITS The figures listed below and included in this edition of NEETS, Module 23, MagneticRecording, were provided by Datatape, Inc. Permission to use these illustrations is gratefully acknowledged.

SOURCE FIGURE Datatape, Inc. 3-2, 3-3, 3-4, 5-3, 6-3, 6-4 A&B, 7-1, 7-4, 7-5, 7-6 iv NAVY ELECTRICITY AND ELECTRONICS TRAININGSERIES The Navy Electricity and Electronics Training Series (NEETS) was developed for use by personnel in many electrical- and electronic-related Navy ratings. Written by, and with the advice of, senior technicians in these ratings, this series provides beginners with fundamental electrical and electronic concepts through self-study. The presentation of this series is not oriented to any specific rating structure, but is divided into modules containing related information organized into traditional paths of instruction. The series is designed to give small amounts of information that can be easily digested before advancing further into the more complex material. For a student just becoming acquainted with electricity or electronics, it is highly recommended that the modules be studied in their suggested sequence.

While there is a listing of NEETS by module title, the following brief descriptions give a quick overview of how the individual modules flow together. Module 1,Introduction to Matter, Energy, and Direct Current, introduces the course with a short history of electricity and electronics and proceeds into the characteristics of matter, energy, and direct current (dc). It also describes some of the general safety precautions and first-aid procedures that should be common knowledge for a person working in the field of electricity. Related safety hints are located throughout the rest of the series, as well. Module 2,Introduction to Alternating Current and Transformers, is an introduction to alternating current (ac) and transformers, including basic ac theory and fundamentals of electromagnetism, inductance, capacitance, impedance, and transformers. Module 4,Introduction to Electrical Conductors, Wiring Techniques, and Schematic Reading, presents conductor usage, insulation used as wire covering, splicing, termination of wiring, soldering, and reading electrical wiring diagrams. Module 5,Introduction to Generators and Motors, is an introduction to generators and motors, and covers the uses of ac and dc generators and motors in the conversion of electrical and mechanical energies. Module 6,Introduction to Electronic Emission, Tubes, and Power Supplies, ties the first five modules together in an introduction to vacuum tubes and vacuum-tube power supplies. Module 7, Introduction to Solid-State Devices and Power Supplies, is similar to module 6, but it is in reference to solid-state devices. Module 8,Introduction to Amplifiers, covers amplifiers. Module 9,Introduction to Wave-Generation and Wave-Shaping Circuits, discusses wave generation and wave-shaping circuits. Module 10,Introduction to Wave Propagation, Transmission Lines, and Antennas, presents the characteristics of wave propagation, transmission lines, and antennas. v Module 11,Microwave Principles, explains microwave oscillators, amplifiers, and waveguides. Module 12,Modulation Principles, discusses the principles of modulation. Module 13,Introduction to Number Systems and Logic Circuits, presents the fundamental concepts of number systems, Boolean algebra, and logic circuits, all of which pertain to digital computers.

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