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