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| Preface | |
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| Acknowledgments | |
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| Introduction | |
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| Tuned Radio-Frequency (TRF) Radios | |
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| Block Diagram of a TRF Radio | |
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| Circuit Description of a TRF Radio | |
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| Regenerative Radio | |
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| Block Diagram of a Regenerative Radio | |
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| Circuit Description of a Regenerative Radio | |
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| Reflex Radio | |
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| Block Diagram of a Reflex Radio | |
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| Circuit Description of a Reflex Radio | |
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| Superheterodyne Radio | |
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| Block Diagram of a Superheterodyne Radio | |
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| Circuit Description of a Superheterodyne Radio | |
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| Software-Defined Radio Front-End Circuits | |
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| Block Diagram of a Software-Defined Radio Front End | |
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| Description of Front-End Circuits for a Software-Defined Radio System | |
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| Comparison of the Types of Radios | |
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| Calibration Tools and Generators for Testing | |
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| Alignment Tools | |
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| Test Generators | |
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| Inductance Meter | |
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| Capacitance Meter | |
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| Oscilloscopes | |
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| Radio Frequency (RF) Spectrum Analyzers | |
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| Where to Buy the Tools and Test Equipment | |
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| Components and Hacking/Modifying Parts for Radio Circuits | |
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| Antenna Coils | |
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| Variable Capacitors | |
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| Transistors | |
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| Earphones | |
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| Speakers | |
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| Passive Components | |
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| Vector and Perforated Boards | |
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| Hardware | |
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| Parts Suppliers | |
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| Building Simple Test Oscillators and Modulators | |
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| The Continuous-Wave Signal | |
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| The Amplitude-Modulated Signal | |
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| First Project: ACWRF Test Oscillator | |
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| Modulator Circuit for the CW Generator | |
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| Parts List | |
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| Alternate Circuits | |
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| Parts List | |
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| Low-Power Tuned Radio-Frequency Radios | |
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| Design Considerations for TRF Radios | |
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| Improving Sensitivity and/or Selectivity via Antenna Coils or Circuits | |
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| First Design of TRF Radio | |
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| Parts List | |
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| Circuit Description | |
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| Variation of the Design (Alternate Design of the TRF Radio) | |
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| Parts List | |
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| Author's Earlier TRF Designs | |
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| Transistor Reflex Radios | |
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| Motivation Behind Amplifying Both Radio-Frequency and Audio-Frequency Signals | |
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| One-Transistor TRF Reflex Radio | |
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| Parts List | |
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| Multiple-Transistor Reflex Radio Circuit | |
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| Parts List | |
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| A Low-Power Regenerative Radio | |
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| Improving Sensitivity by Regeneration | |
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| Improving Selectivity by Q. Multiplication via Regeneration | |
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| Design Considerations for a Regenerative Radio | |
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| Parts List | |
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| Parts List | |
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| Parts List | |
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| Superheterodyne Radios | |
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| Commercially Made Transistorized Superheterodyne Radios | |
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| A Four-Transistor Radio Schematic | |
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| Parts List | |
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| An Eight-Transistor Radio | |
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| Parts List | |
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| Alternative Oscillator and Antenna Coil Circuit | |
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| An Item to Note | |
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| Low-Power Superheterodyne Radios | |
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| Design Goals for Low Power | |
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| Low-Power Oscillator, Mixer, and Intermediate-Frequency Circuits | |
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| Low-Power Detector and Audio Circuits | |
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| "First" Design of a Low-Power Superheterodyne Radio | |
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| Parts List | |
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| Alternative Low-Power Superheterodyne Radio Design | |
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| Parts List | |
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| Photos of Low-Power AM Superheterodyne Radios | |
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| Exotic or "Off the Wall" Superheterodyne Radios | |
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| A One-Transistor Superheterodyne Radio | |
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| Design Considerations for a One-Transistor Superheterodyne Radio | |
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| Parts List | |
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| A Two-Transistor Superheterodyne Radio | |
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| Parts List | |
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| Inductor-less Circuits | |
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| Ceramic Filters | |
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| Parts List | |
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| Gyrators (aka Simulated or Active Inductors) | |
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| Inductor-less (aka Coil-less) Superheterodyne Radio | |
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| Parts List | |
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| Introduction to Software-Defined Radios (SDRs) | |
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| SDR Front-End Circuits, Filters, and Mixers | |
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| Phasing Circuits for 0- and 90-Degree Outputs for I and Q Signals | |
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| Multipliers for Generating 0- and 90-Degree Phases | |
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| Example Radio Circuits for Software-Defined Radios | |
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| Parts List | |
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| Second SDR Front-End Circuit for the 40-Meter Amateur Radio Band | |
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| Parts List | |
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| Oscillator Circuits | |
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| One-Transistor Oscillator | |
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| Differential Pair Oscillator | |
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| References | |
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| Mixer Circuits and Harmonic Mixers | |
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| Adding Circuits Versus Mixing Circuits | |
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| Distortion Can Be a Good Thing (for Mixing) | |
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| Single-Bipolar-Transistor Distortion | |
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| Simple Transistor Mixer and Its Conversion Transconductance | |
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| Differential-Pair Mixer | |
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| Harmonic Mixer Circuits | |
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| Mixer Oscillator Circuits | |
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| Conversion Gain | |
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| References | |
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| Sampling Theory and Sampling Mixers | |
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| Sampling Signals as a Form of Muliplication or Mixing | |
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| Finite Pulse-Width Signals | |
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| Aliasing Is a Mixing Effect | |
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| Multiplexer Circuits as Balanced Mixers | |
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| Tradeoffs in Performance of the Mixers | |
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| References | |
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| In-Phase and Quadrature (IQ) Signals | |
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| Introduction to Suppressed-Carrier Amplitude Modulation | |
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| How I and Q. Signals Are Generated | |
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| Demodulating I and Q Signals | |
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| I and Q Signals Used in Software-Defined Radios (SDRs) | |
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| References | |
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| Intermediate-Frequency Circuits | |
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| IF Amplifiers | |
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| Gain-Controlled IF Amplifiers | |
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| Considerations of Distortion Effects on IF Amplifiers | |
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| References | |
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| Detector/Automatic Volume Control Circuits | |
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| Average Envelope Detectors | |
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| Power Detectors | |
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| Synchronous Detectors | |
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| IQ Detectors for AM Broadcast Signals | |
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| Measuring an Average Carrier or Providing Automatic Volume Control | |
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| References | |
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| Amplifier Circuits | |
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| Introduction to Operational Amplifiers | |
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| Amplifier Characteristics | |
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| Connecting Multiple Amplifiers for an Amplifier System | |
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| Practical Considerations for Using Amplifiers | |
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| References | |
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| Resonant Circuits | |
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| Simple Parallel and Series Resonant Circuits | |
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| Resonant Circuits in Oscillators | |
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| Examples of Band-Pass and Band-Reject Filters | |
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| References | |
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| Image Rejection | |
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| What is an Image Signal? | |
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| Methods to Reduce the Amplitude of the Image Signal | |
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| Analysis of an Image-Rejection Mixer Using I and Q Signals | |
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| Analysis of the Image-Reject Mixer | |
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| Consequences of an Imperfect 90-Degree Phase Shifter on Reducing the Image Signal | |
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| References | |
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| Noise | |
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| Sources of Random Electronic Noise and Some Basic Noise Theory | |
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| Paralleling Transistors for Lower Noise | |
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| Differential-Pair Amplifier Noise | |
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| Cascode Amplifier Noise | |
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| Selecting Op Amps | |
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| References | |
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| Learning by Doing | |
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| Update on the One-Transistor Superheterodyne Radio | |
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| Comments on SDR 40-Meter Front-End Circuit | |
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| Experimenting with Mixers and Using the Spectran Spectrum Analyzer Program | |
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| Conducting Experiments on Op Amps and Amplifiers | |
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| Experiments with a Resonant Circuit | |
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| Thevenin-Equivalent Circuit | |
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| Analyzing a Bridge Circuit | |
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| Some Final Thoughts on the Book | |
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| References | |
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| Parts Suppliers | |
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| Inductance Values of Oscillator Coils and Intermediate-Frequency (IF) Transformers | |
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| Short Alignment Procedure for Superheterodyne Radios | |
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| Index | |