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How to Service Radios with an Oscilloscope - Sylvania
HOW TO SERVICE RADIOS WITH AN OSCILLOSCOPE
This 72-page book in Adobe Acrobat .pdf format is designed to help you obtain a thorough understanding of one of the primary tools in electronics, the Oscilloscope. The text of this book assumes no previous understanding of electronic theory on your part. It is written to provide you with a great deal of useful information concerning vintage radio servicing with an oscilloscope, regardless of your background, whether you are still a beginner or a person experienced in electronics.
From the book...
PREFACE
The purpose of this book is to explain in a practical manner the operation and applications of the cathode ray oscilloscope. This is not an engineering manual. We expect that our readers will be radio and amplifier servicemen, and some radio operators, students and technicians.
Because of its general usefulness for all kinds of radio work, the oscilloscope deserves to be used much more widely than it is now. We believe that radio servicemen have neglected the oscilloscope more because of a lack of knowledge of how to use it than for any other single reason. This book explains in simple terms the steps to follow in using an oscilloscope to service AM and FM radios, audio amplifiers and transmitters. All theoretical material has been sifted, condensed and sifted again. Only absolutely essential theory — theory which we believe will be of real value to radio servicemen — has been retained. We have tried to keep the language as simple as possible and yet give complete and technically accurate explanations as well as detailed pictorial material to aid in a better understanding of the function of the oscilloscope.
Space in any book unfortunately is limited. There has not been room for every one of the thousands of applications of the oscilloscope. We have selected for complete explanation those applications which are most likely to be of interest and service to our readers. If we have been able, in any measure, to save radio servicemen time and trouble and make their tasks more interesting and enjoyable through better understanding and familiarity with new tools, we will consider our job not so badly done.
TABLE OF CONTENTS
CHAPTER I - OSCILLOSCOPE FUNDAMENTALS
1.1 Usefulness of the Oscilloscope
1.2 Cathode Rays
1.3 The Electron Gun
1.4 Defecting Plates
1.5 How an AC Signal Affects the Beam
1.6 Sensitivity
1.7 Cathode Ray Tube Sizes
CHAPTER II - THE LINEAR TIME BASE
2.1 Function of Time Base
2,2 Sweep Voltage Nature and Source
2.3 Sweep and Signal Voltage Relations
CHAPTER III - THE COMPLETE OSCILLOSCOPE
3.1 Instrument Arrangement
3.2 Sylvania Oscilloscope Type 131
3.3 Sylvania Oscilloscope Type 132
CHAPTER IV - VOLTAGE MEASUREMENTS WITH THE OSCILLOSCOPE
4.1 Cathode Ray Tube as V. T. Voltmeter
4.2 Voltage Measurement Principle
4.3 DC Voltage Measurement
4.4 Alternating Voltage Measurement
4.5 Sensitivity of Oscilloscope Voltmeter
4.6 Calibration of Oscilloscope as Voltmeter
4.7 Gain Control Calibration
4.8 Calibration of Direct Input
4.9 Calibration of Horizontal Plates
4.10 Extension of Screen Scale
CHAPTER V - USE OF THE OSCILLOSCOPE IN RADIO RECEIVER SERVICING
5.1 AM Receiver Alignment Using AM Signal Generator
5.2 AM Receiver Alignment Using FM Signal Generator
5.3 Aligning Flat-Topped High-Fidelity Receivers
5.4 Additional Instructions on Receiver Alignment
5.5 FM Receiver Alignment
5.6 AFC Alignment
5,7 Checking AVC Action
5.8 Establishing Marker Points
5.9 Finding Receiver Faults from Oscilloscope Patterns
5.10 Signal Tracing and Trouble-Shooting of Radio Receivers
5.11 Testing AM Superhets
5.12 Testing FM Receivers
CHAPTER VI - USE OF THE OSCILLOSCOPE IN AUDIO AMPLIFIER TESTING
6.1 Signal Transmission Test in Single Amplifier Stage
6.2 Measurement of Voltage Gain
6.3 Locating Hum
6.4 Distortion Measurements with Sine Waves
6.5 Distortion Measurements with Square Waves
6.6 Checking Frequency Response
6.7 Signal Tracing in Audio Amplifier
CHAPTER VII - USE OF THE OSCILLOSCOPE IN TRANSMITTER TESTING
7.1 Modulation Checking with Wave Patterns
7.2 Modulation Checking with Trapezoidal Patterns
7.3 Detecting Hum and Noise on Carrier
7.4 Checking Class-C Linearity
CHAPTER VIII - MISCELLANEOUS APPLICATIONS
8.1 Frequency Checking with Circular Pattern
8.2 Frequency Checking with Sine-Wave Pattern
8.3 Frequency Checking with Other Patterns
8.4 Frequency Checking with Intensity Modulation
8.5 Calibration of Fine Frequency Control
8.6 Checking Phase Relationships
8.7 Checking Phase Inverter Action
8.8 Current Measurement with Oscilloscope
8.9 Impedance Measurement
8,10 AC Power Supply Tests
8.11 Checking Ripple Current in Filter Capacitors
8,12 Checking Peak Current in Rectifiers
8.13 Auto Radio Vibrator Tests
8.14 Checking DC Generator Ripple
8.15 Use of Oscilloscope as Bridge Null Detector
8.16 Use of Oscilloscope as Zero Beat Indicator
8.17 Exploring Probe for RF Signal Tracing
8.18 Demonstration of Speech Waveforms
8.19 Electronic Switch
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