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CONTENTS
CHAPTER I
NATURE OF WIRELESS TRANSMISSION
Theory; Action of Radiant Waves; Interference; How
Signals Are Sent; Wave Lengths Used
CHAPTER II
AERIALS
The Antenna; Dimensions; Supports; Height and Length;
Various Types; 200 Meter Design; Table for Various
Wave Lengths; Radiation Resistance; Capacity and
Inductance; Insulation and Construction; Poles and
Guy Wires
CHAPTER III
COIL AND SUB-SURFACE SYSTEMS
Multi-Turn Coil Receiver; Portable Receiving Long Dis-
tance Set; Principle of Coil Action; Directional Effects
of Coils; Types and Construction; Radio Compass.
Sub-Surface Radio; Antenna Buried Underground;
Roger's System; U. S. Navy Experiments
CHAPTER IV
GROUNDS AND LIGHTNING PROTECTION
Ground Connections; Various Types; Construction; Light-
ning Protectors; A Safe Radio Station; Underwriter's
Rules
PAGE
11
23
48
57
CHAPTER V
THE TRANSMITTER AND RESONANCE
Transmitting Circuit; Principle of Oscillations; Action of
Energy; Resonance; Period of Vibration; Adjustments;
Harmonic Effects; Resistance; Beats; Typical Curves
for Various Transmitters; Damping; Relation of An-
tenna Current and Voltage; Experiment Illustrating
Coupling
CHAPTER VI
WAVE LENGTH, CAPACITY, AND OSCILLATION
CIRCUITS
Damped Wave Transmitter; Calculation of Wave Length,
Capacity, and Circuits; Range of Transmission; Power;
Frequency and Voltage; Table of Capacities; Formula
for 200 Meter Calculations; Spark Gap; Antenna Cir-
cuit; Percentage of Coupling; Example of a Complete
Spark Transmitter; Dimensions
CHAPTER VII
65
90
TRANSFORMERS AND SPARK COILS CONSTRUCTION
DETAILS
Principle of Induction Coil; Transformer Construction
Data; Building a Transformer; Reactance Coil; Spark
Coil; Table for Various Spark Coils with Dimensions 108
CHAPTER VIII
AUXILIARY APPARATUS
Keys; Electrolytic Interrupter; Kickback Prevention; Aerial
Switches; Automatic Antenna Switch; Storage Bat-
teries
121
CHAPTER IX
CONDENSERS AND CAPACITIES
Condenser Theory; Calculation of Capacities; Dielectric
Table; Building Condensers; Dimensions and Mate-
rials
133
CHAPTER X
INDUCTANCES
Calculation of Inductance; Construction of Helix and Os-
cillation Transformer; Simple Formulas for Definite
Low Wave Length Sets
CHAPTER XI
SPARK GAPS
Purpose of Gap; Materials Suitable; Series Gap; Rotary
Gap; Construction of Rotary Gap; Rotary Quenched
Gap; Rotary Gap Circuits; Chaffee Gap; Two Tone
Gap
CHAPTER XII
RADIATION INDICATORS AND MEASUREMENTS
Use of Radiation Indicators; Hot Wire Ammeter Construc-
tion; Wave Meter; Use of Hot Wire Ammeter; Shunt
Resonator; Cost of Transmitter Complete; Frequency;
Decrement; Logarithmic Decrement Illustrated; Elec-
tron Tubes for Measurements; Audion Connected to
Wave Meter
CHAPTER XIII
ADVANCED SYSTEMS
Continuous Waves; Wireless Telephone; Quenched Spark;
High Frequency Alternators; Demonstration of Arc
Radiotelephone; Poulsen Arc; Construction of
Quenched Gap; Lepel Gap; Advantage of Quenched
Gaps; Wireless Piano; Goldschmidt Alternator; Alex-
anderson Alternator; Magnetic Modulator; Static
Transformer Frequency Multiplier; Onde Unique Sys-
tem; Vacuum Tube Methods; Duplex High Speed
Operation; Wave Changing Systems
CHAPTER XIV
VACUUM VALVES AND CIRCUITS
Vacuum Tubes; Amplifiers; Detectors; Oscillators; Modu-
lators; Tube Radiotelephones; Experiments Showing
148
158
170
187
Fundamental Action; Two and Three Electrode Tubes;
Curves of Operation; How the Circuits Work; Opera-
tion of Grid; Audion Circuits; Lieben Reisz Amplifier;
Pliotron; Cascade Amplifier; Outside Grid Tube; Dyna-
tron; Chart of Vacuum Tube Circuits for all Purposes;
Ultra-audion Receiver; Damped and Undamped Wave
Circuits; Audion Generator; Armstrong Circuit; Con-
struction of Long Wave Length Oscillating Receiver;
Adjustment of Oscillating Circuit; Short Wave Length
Repeating Amplifying Receiver; Cascade Circuits; Ad-
vantages and Disadvantages of Audion; Combined Crys-
tal Detector and Audion; Sensitizing Circuits; Special
Vacuum Tube Circuits; Self-tuned Oscillation Genera-
tor; Self-Modulated Transmitter; New Tube Circuits 207
CHAPTER XV
TUBE RADIOTELEPHONES
Modulation Systems; Portable Radiotelephone; Transconti-
nental Wireless Telephone; Connection of Tubes; U. S.
Army Set; U. S. Navy Set; A Wireless Telephone
Operated from Your Lamp Socket; Power Tube Radio-
telephone; A Small Amateur Radiophone; Cost of a
Telephone Set
CHAPTER XVI
THE RECEIVING STATION
Operation of Receiver; Telephone Receivers; Purpose of
Detector; Energy of Signal Received; Types of De-
tectors; Principles of Operation
238
251
CHAPTER XVII
DETECTORS
Vacuum Tube Detectors; Solid Rectifiers; Crystals; Con-
struction of Detectors; Crystal Mounting; Adjust-
ments; Buzzer Test
257
CHAPTER XVIII
SENSITIVE INDICATORS FOR RECEIVING SETS
Telephone Receivers; Continuous Wave Detectors; Ein-
thoven Galvanometer; Construction of Indicators;
Automatic Indicators; Hoxie Photographic Recorder;
Amplifiers; Microphone Amplifier; Baldwin Receiver;
Adjustments; How Receiver Operates; Measuring In-
tensity of Received Signal; Audibility Meter
CHAPTER XIX
TUNING AND INTERFERENCE PREVENTION
Principle of Resonance Used in Tuning; Interference;
Mitigating Various Kinds of Interference; Tuning
Methods; How to Tune_ a Receiving Set; Receiving
Circuits; Loose Coupled, Bridge, and Interference Miti-
gating Circuits; How to Use a Loose Coupler; Bal-
ancing Out Power Line Hum
CHAPTER XX
SPECIAL RECEIVING SETS
Time Signal Receiver; Weagant's Stray Mitigator; Alexan-
derson Barrage Receiver; Heterodyne Receiver; Action
of Heterodyne Circuit; Phase Modified Receivers; Bal-
ance Systems; Construction of Phase Rotator; Phase
Shifting Explained; Multiple Unit Phase Shifting Re-
ceivers; Uni-Control and Automatic Receivers; Ca-
pacity Coupling; Universal Receiving Set for Long and
Short Damped and Undamped Wave Signals; Autodyne
Receiver; Magnetic Tube Sensitizer; Short Wave Os-
cillating Receiver; New Circuits
CHAPTER XXI
RECEIVING CONDENSERS
Construction of Fixed and Variable Condensers; Circuits
for Condensers; Building a Condenser; Korda Air Con-
denser; Assembly of Plates; Geared Fine Adjustment
Condenser
CHAPTER XXII
CONSTRUCTION OF RECEIVING INDUCTANCES
Tuners; Loose Couplers; Loading Coils; Sliders; Windings
for Desired Wave Lengths; Variometer; Variometer
Phase Rotator; Switching; Dead End Elimination; Tens
and Units Connection; Multilayer Coils; Compact Long
269
283
300
314