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 -