Electrical Communication is a free textbook on the basics of communication technology. See the editorial for more information....

Overview
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radiation fieldProduction of Electromagnetic Waves
radiation lossResistance
radiation patternFree-Space Radiation Patterns from Periodic Straight-Wire Antennas
 Radiation Patterns from Periodic Straight-Wire Antennas
radioThe Development of Radio or Wireless Communication
radio communicationThe Establishment of Radio Communication
radio frequenciesFrequencies Used in Communication
 Radio Frequencies Used in Communication
radio interferenceRadio Interference
 Electrical Noise
radio relay systemsRadio-Relay Systems
radio systemsRadio Systems
radio-telegraph systemsAmplitude-Modulation Radio-Telegraph Systems
ratio detectorThe Demodulation of Frequency-Modulated Waves
Rayleigh-Carson reciprocity theoremAntennas, or Aerials
reactance modulationMethods of Producing Frequency-Modulated Waves
receiverHand and Head Receivers
 Receivers for Telephone Handsets
 Miscellaneous Receivers and Loudspeakers
 Amplitude-Modulation Radio Receivers
reciprocity theoremNetwork Theorems
rectangular wave guideRectangular Wave Guides
rectifierRectifiers
 Crystal Rectifiers
 Metallic Rectifiers
 Basic Rectifier Circuits
rectifier filterRectifier Filters
 Cutout in Rectifier Filters
RectigonHigh-Pressure Gas Thermionic Diodes
reentrant networkAntenna Feeder Systems and Impedance-Matching Networks
referencesReferences
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reflected impedanceInductively Coupled Circuits
reflected waveInput Impedance of Any Line with Any Termination
reflectionWave Reflection on Lines (and Cables)
 The Ionosphere
 Radio Wave Reflections from the Earth
 Sky-Wave Propagation
reflection factorReflection Loss
 Ground-Reflection Factors
reflection gainReflection Loss
reflection lossReflection Loss
reflectorDirectional Periodic Antennas
reflex KlystronVelocity-Modulated Oscillators
refractionThe Ionosphere
regenerative repeaterRegenerative Repeaters
relayThree-Electrode Cold-Cathode Tubes
 Polar Direct-Current Telegraph Systems
release historyDownload and Release History
repeaterNeutral, or Single-Current, Telegraph Relays and Repeaters
 Regenerative Repeaters
 Telephone Repeaters
 Early Telephone Repeaters
 Vacuum-Tube Telephone Repeaters
 The 21-Type Repeater
 The 22-Type Repeater
 Four-Wire Repeater
 The V1 Repeater
 Repeater Applications
repeating coilClosely Coupled Circuits
repeating coilsThe Phantom Circuit
reperforator switchingTelegraph Switching Systems
residuals in power systemsBalanced and Residual Currents and Voltages
resistanceResistance
resistance-stabilized oscillatorInductance-Capacitance (L-C) Oscillators
resistorResistance
 Resistor
resonanceSeries (Phase) Resonance
 Parallel (Phase) Resonance
resonant antennaPeriodic Resonant Antennas
resonant feedersAntenna Feeder Systems and Impedance-Matching Networks
resonant linesInput Impedance of Open and Shorted Lossless Lines
resonant Vee antennaOther Periodic Antennas
reverberationReverberation
 Measurements of Reverberation Time
 Reverberation Time in "Live" Rooms
 Reverberation Time in "Dead" Rooms
 Acoustics of Auditoriums
 Acoustics of Studios
review questionsReview Questions
 Review Questions
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RF power amplifierRadio-Frequency Power Amplifiers
rhombic antennaThe Rhombic Antenna
ribbon microphoneThe Ribbon or Velocity Microphone
ringerPolarized Ringers or Bells
rotary dial systemThe Development of Telephone Service
 Rotary Dial System
rotary type switchLine Switches
Ruhmkorff coilThe Establishment of Radio Communication

Last Update: 2011-06-06