Radar, the Electronic Eye

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Contents - INTRODUCTION - 1. RADAR IN WAR - What Radar is - Radar and the U-boats - Radar in Naval Battles - General Characteristics and Requirements - 2. RADAR DISTINGUISHED FROM RADIO - Relations among Frequency, Wave Length, Velocity- Comparison of Power Transmitted and Received - Power Received by a Radar Receiver - Advantages of Microwaves - 3. TRANSMISSION LINES, WAVE GUIDES, CAVITIES - Characteristic Impedance of Infinite Line - Electric and Magnetic Fields in Wave Guides - Modes in Wave Guides - The Magic or Hybrid T - Resonance Effects in Wave Guides - Evolution of the Cavity Resonator - Segments of Transmission Lines - Filters for Wave Guides - 4. TUBES FOR RADAR OSCILLATORS - Ineffectiveness of Ordinary Vacuum Tubes - Movement of Charge Produces Current - Operation of Magnetrons - Manufacture of Magnetrons - Klystrons - 5. THE RECEIVER - General Requirements of Radar Receiver - Requirements of Superheterodyne in Radar - Radar Crystals - Local or Beating Oscillator - Intermediate Amplifier - Need for Frequency Control - Details and Operation of Discriminator - Video Amplifier - 6. MODULATORS AND WAVE SHAPERS - Phase Relations - Production of sawtooth waves - Multivibrators - Electronic Switch - Blocking Oscillator - Pulse Transformer - Modulator with Saturable Core Reactor Switch - 7. INDICATORS AND CATHODE RAY TUBES - Types of Indicators - Electrostatic Cathode Ray Tube - Cathode Ray Tube Screens - Magnetic Cathode Ray Tube - Sweep Circuit and Amplifier - Producing Sweeps for Magnetically Controlled Indicators - 8. ROTARY INDUCTORS - Synchros - Types of Synchro Combinations - Synchro-generator - Synchro-motor - Resolvers - D.C. Selsyns - Servos - Use of Servo-Amplifier with D.C. Motor - Servo Employing an Amplidyne - 9. TRANSMIT-RECEIVE DEVICES - Purpose of T-R Switch - Operation of T-R Switch - Details of T-R Switch - Cause of "Spike" in Discharge - Life of T-R Tube - Details of Switching Action - 10. ANTENNAS - Antenna as Transmission Line - Character of Fields Around Antennas - Use of Reflectors with Antennas - How Antennas are fed - Effect of Earth on Transmission - Radar Line of Sight - Metal Lens Antenna - II. OBSERVATIONS ON RADAR SYSTEMS - Simple Radar in Block Form - Three-centimeter Radar System - Ten-centimeter Radar System - Size of Target and Width of Beam - Factors Determining Range of Radar - Strength of Echo - 12. MEASUREMENTS AND TESTING - Measurements of Fields Important in Radar - Wave Meters - Echo Box - Measurement of Low Power with Thermistor - Measuring Loss in Dielectrics - Care and Measurements of Magnetron - Microwave Signal Generator - 13. FUNDAMENTAL COMPONENTS IN RADAR - Materials and Construction of Wire-wound Resistors - Uses of Thermistors - Materials and Properties of Coils - Impedance of Transmission Lines in Practice - Electromagnetic Delay Lines - Lines with Distributed Parameters - Methods of Varying Delay in Lines - Bandwidth of Piezo-Electric Crystals - Resistance Wire - Treatment of Winding - Noise - Variable Condensers for Shift in Phase - Converters - Inverters - Vibrators - Circuit of a Vibrator - General Requirements of Relays - Magnetic Circuits of Relays - Temperature Limitations of Relays - Relation of Air Gap to Relay Operation - 14. RADAR IN PEACETIME - Guiding Airplanes for Landing - Use of Beacons - Navigating with Loran - Radar as Altimeter - Use of Radar to Prevent Collisions - Corner Reflectors - Limits of Radar - Pseudo-Radar - Radar in the Future - GLOSSARY - APPENDIX - INDEX -