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Radio Troubleshooting Guidebook - 1954

Radio Troubleshooting Handbook by John F. Rider and J. Richard Johnson (1954, 168 pages). This is an excellent book that covers all aspects of troubleshooting vintage radios. Explains causes and fixes for distortion, weak signals, noise, undesired signals, and how to troubleshoot a dead receiver. If you like working on vintage tube-based radios this book is for you!!! No radio repair workbench should be without it!!!



Chapter 1 - A-M Superheterodynes

1-1 Troubleshooting and the Receiver Function

1-2 Comparison of T.R.F. and Superheterodyne Receivers

1-3 Functional Receiver Sections

1-4 Typical A-M Superheterodyne Arrangements

1-5 Importance of Basic Sections

1-6 R-F Section

1-7 Conversion Section

1-8 Pentagrid Converters

1-9 Triode-Heptode and Triode-Hexode Converters

1-10 Critical Nature of Converter Oscillator Sections

1-11 Separate Oscillator-Tube Arrangements

1-12 Intermediate Frequencies

1-13 I-F Amplifier Section

1-14 Second Detectors, or Demodulators

1-15 A-F Amplifier Section

1-16 Automatic Volume Control (AVC)

1-17 Automatic Frequency Control (AFC)

1-18 Double-Conversion Superheterodynes

1-19 Crystal Filters

Chapter 2 - F-M Superheterodynes

2-1 Universal Use of Superheterodyne for F-M Reception

2-2 Types of F-M Receivers

2-3 R-F Section

2-4 Conversion Section

2-5 I-F Amplifier Section

2-6 Methods of Demodulation

2-7 Limiter Stage

2-8 The Phase Discriminator

2-9 The Ratio Detector

2-10 The Locked-Oscillator Detector

2-11 The Gated-beam Detector

2-12 Combination A-M/F-M Receivers


Chapter 3 - Fundamental Troubleshooting Systems

3-1 Troubleshooting Systems

3-2 Importance of Service Data

3-3 Quick Preliminary Tests

3-4 Troubleshooting Equipment

3-5 Static Tests

3-6 Resistance Measurements

3-7 Voltage Measurements

3-8 Capacitance, Inductance, and Resce Measurements

3-9 Current Readings

3-10 Advantages of Signal Tracing

3-11 Preliminary Tests

3-12 Signal Source for Signal Tracing

3-13 Tracing Instruments

3-14 Signal Injection

3-15 Gain Measurements in Troubleshooting

3-16 Alignment in Troubleshooting

3-17 Determining Unknown Intermediate Frequency


Chapter 4 - Undesired Signals

4-1 Causes and Sources of Undesired Signals

4-2 Image Interference

4-3 Important Factors about Interference Symptoms

4-4 Symptoms and Contributing Causes

4-5 Interfering Station Frequency is 10 KC from Desired Station Frequency

4-6 Interfering Frequency Equal to the Frequency of the Desired Station, Plus Twice the Numerical Value of the Intermediate Frequency

4-7 Interfering Frequency Equal to the Frequency of the Desired Station, Minus Twice the Numerical Value of the Intermediate Frequency

4-8 With Converter, Interfering Frequency Equal, or Close, to Intermediate Frequency of Converter

4-9 With Converter, Interfering Frequency within 20 or 30 KC of Converter Intermediate Frequency

4-10 Interfering Frequency Differs from Desired Frequency by Value of the Intermediate Frequency

4-11 Interfering Frequency Differs from Desired Frequency by Slightly More or Less Than the Intermediate Frequency

4-12 Interfering Station Appears During Lapse of Desired Station Modulation without Any Change of Dial Setting (Reception May Be Fuzzy of Blurred at Times or Accompanied by Wobble or Low-Pitched Hum)

4-13 Police, Amateur, Aircraft, or Other Short-Wave Interference of a Frequency Higher Than the Tuning Range of the Receiver

4-14 Untunable, Intermittent Code or Speech Interference (Is a Background to All Desired Stations, Regardless of the Setting of Receiver Dial)

4-15 Nearby Transmitter Signal Blankets Certain Spots on Tuning Dial but Does Not Interfere with Other Distant Stations

4-16 Signal from Powerful Local Station Appears at Several Points Along Dial (Repeat Tuning with Single-Dial Receiver)

4-17 Heterodyne Whistle at 910 KC in Receiver with 455-KC Intermediate Frequency

4-18 High-Frequency A-M Broadcast Stations Received at Low End of Dial

4-19 Converter with Tunable Whistles at Various Frequencies

4-20 Converter or Double-Conversion Receiver Wit Tunable Heterodyne Whistles at Random Frequencies

4-21 Strong Tunable Whistle from Beat Frequency (C-W) Oscillator

4-22 Strong Tunable Whistle on Each Station, with No Beat Oscillator

4-23 Whistle or Growl Backgroundto All Stations

4-24 Station Can Be Tuned inat Two Points on Dial

4-25 Whistle at Frequencies Slightly Lower or Higher Than I-F Peak

4-26 Receiver Operative Over a Portion of the Dial

4-27 Desired Station Disappears Gradually and Other Station Signal Slowly Comes In

4-28 Interfering Signal Appears After Period of Use (Although R-F, Mixer, and Oscillator Circuits Are Perfectly Aligned and Desired Signal Strength Is Substantially Normal)

4-29 Frequent Readjustment of the I-F Trimmers Required

4-30 Steady Howl on All Stations

4-31 Steady Rushing Noise over Part, or All, of Tuning Range, with Trace of Some Signals Through It

4-32 Whistle Heterodyne SweepsRapidly Back and Forth Across Desired Signal During Normal Reception, or Gradually Lowers or Raises in Pitch and Settles at One Steady Tone, without Any Adjustment of Receiver

4-33 Roughly Modulated Signal, Unstable, Received About Every 16 Kc Through the A-M Broadcast Band and on Short Waves, Heterodyning Whenever Signals are Received

4-34 F-M Receivers Less Susceptible to Interference

4-35 Interference from a Station 21.4 Mc Higher Than Desired Station

4-36 Whistle Sweeps Across Received Signal Frequency or Slowly Settles Down to Steady Frequency-Modulated Whistle

4-37 Desired Signal Becomes Distorted and Fades, Adjacent Channel Comes In

4-38 Desired Station Suddenly Disappears and Another Station Takes its Place; New and Desired Stations Change Off Intermittently

4-39 Signal on Adjacent Channel Interferes

Chapter 5 - Weak Signals

5-1 Importance of Testing Tubes

5-2 Static Tests in Weak Receivers

5-3 Signal Tracing in Weak Receivers

5-4 Testing the A-F Signal in Weak Receivers

5-5 Check List of Most Common Causes of Weak Signals

5-6 Distinguishing Between Failure of R-F and A-F Sensitivity

5-7 Other Variations of the Weak-Signal Symptom

5-8 Weak Signals over a Part of Tuning Range (Sometimes Accompanied by Distortion)

5-9 Weak Signals Over Certain Bands of a Multiband Receiver

5-10 Weak Signals Over Part of Tuning Range, with Converter

5-11 Switching Lights or Appliances On or Off Causes Weak Signals

5-12 Distant Station Gradually Becomes Weak, Then Returns Gradually to Full Strength; Locals Remain Steady

5-13 In Battery Receiver, All Stations Gradually Become Weaker

5-14 Midget Receiver with Loop Antenna Gives Weak Reception When Used in Normal Operating Location

5-15 Receiver with R-F Stage and/or Two or More I-F Stages Produces Weak Signals, with Steady or Tunable Rushing Noise

5-16 Weak Signals but No Other Sound from Loudspeaker Even with Volume Control Advanced

5-17 Weak Signals with Rushing Noise, Volume Control Well Advanced

Chapter 6 - Distortion

Distortion in A-M Receivers

6-1 Nature of Distortion Troubleshooting Problem

6-2 Tracing Distortion

6-3 Distortion Tracing (A-F Circuits)

6-4 Rough, Nasal Sound Accompanied by Whistle

6-5 Hum Modulation on All Signals, Breaking Up Modulation

6-6 Rough, Scratchy Distortion; Worse on Modulation Peaks (Louder Passages)

6-7 Rough, Scratchy Distortion, with Tendency of Receiver to Go Completely Silent (Block) on Strong Signals

6-8 Very Rough, Scratchy Distortion with Considerable Blocking on Stronger Signals

6-9 A-F Signal Broken up and Modulated by Unstable Whistle or Squeel

6-10 Rough, Scratchy Harmonic Distortion at Almost All Signal Levels, without Overloading, in Receivers with Push-Pull Output

6-11 Signal Gradually Becomes Distorted, with Fading

6-12 Fuzzy Rattling and Buzzing with A-F Signal

6-13 A-F Signal Broken up by Heterodyne Whistles from Interfering Signals

Distortion in F-M Receivers

6-14 Problems Similar to Those in A-M Receivers

Chapter 7 - Noise

7-1 What is Noise?

7-2 Random Noise

7-3 Other Types of Noise

7-4 Static Tests

7-5 Tracing Noise

7-6 Sputtering and Frying, Sometimes with Intermittent Buzzing

7-7 Loud Ringing or Distorted Tone, Starting or Stopping when the Receiver is Jarred

7-8 Scratching Noise when Volume Control is Adjusted

7-9 Scratching Noise when Dial is Tuned to Certain Frequencies

7-10 Motorboating (Putt-Putt sound)

7-11 Steady Howl

7-12 Steady Roaring or Buzzing, Stopping Periodically, Sometimes Coming on Only at Certain Times of the Day

7-13 On Short Waves, a Series of Popping or Sputtering Noise Pulses, Having a Regular but Variable Frequency, and Synchronized to Automobile Engine or Other Gasoline Engine

7-14 Noise Problems in F-M Receivers

Chapter 8 - Dead Receiver

8-1 Nature of the Dead-Receiver Symptom

8-2 Can Power Be Safely Applied?

8-3 Preliminary Static Tests to Determine Whether Power Should Be Applied

8-4 Static Tests in Dead Receivers

8-5 Signal Tracing in Dead Receivers

8-6 Sectional Trouble Localization

8-7 Tracing the A-F Signal in Dead Receivers



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