Index D...

D layer	The Ionosphere
dbm	Power Level and Volume
DC bridges	Direct-Current Bridges
DC resistance loss	Resistance
dead room	Reverberation Time in "Dead" Rooms
decibel	The Decibel
delay distortion	Distortion
delay equalizer	Delay Equalizers
demodulation	Demodulation (Detection) of Amplitude-Modulated Waves
detection	Demodulation (Detection) of Amplitude-Modulated Waves
detector	The Establishment of Radio Communication
dial	The Dial
dial telephone	Dial Telephone Systems
dial telephone systems	The Development of Telephone Service
dialing	Nationwide Dialing
diaphragm	The Double-Button Carbon-Granule Microphone
	Types of Acoustic Radiators
	Input Impedance of Telephone Receivers
	Receiver Characteristics with Diaphragm Blocked
	Receiver Characteristics with Diaphragm Free
diaphragm-type crystal microphone	The Crystal Microphone
dielectric hysteresis loss	Resistance
dielectrics	Dielectric Materials Used in Communication
differential duplex system	The Differential Duplex System
diffraction	Radio Wave Transmission Paths
diode	High-Vacuum Thermionic Diodes
	Low-Pressure Gas Thermionic Diodes
	High-Pressure Gas Thermionic Diodes
	Mercury-Arc Rectifiers
	Two-Electrode Cold-Cathode Tubes
dipole	Free-Space Radiation Patterns from Periodic Straight-Wire Antennas
direct-current bridges	Direct-Current Bridges
direct-wave propagation	Direct-Wave Propagation
directional antenna	Directional Periodic Antennas
directional baffles	Horn-Type Loudspeakers
directly heated thermistor	Thermistors
director	Directional Periodic Antennas
discriminator	The Demodulation of Frequency-Modulated Waves
distortion	Distortion
	Distortion Produced by Telephone Transmitters
	Theory of Telephone Receiver Operation
	Telegraph Distortion
distortionless line	The Distortionless Line
distributed amplifier	Wideband Amplifiers
distributed capacitance	Inductor
double refraction	Penetration (Critical) Frequency
double-button microphone	The Double-Button Carbon-Granule Microphone
double-detection receiver	The Superheterodyne Radio Receiver
doublet antenna	Free-Space Radiation Patterns from Periodic Straight-Wire Antennas
download	Download and Release History
driving-point impedance	Input Impedance of Any Open-Circuited Line
	Input Impedance of Any Short-Circuited Line
driving-point impedance	Input Impedance of Any Line with Any Termination
	Driving-Point Impedance of Periodic Antennas
dry-disk rectifier	Metallic Rectifiers
duplex operation	Duplex Operation
duplex telegraph system	Further Development of the Morse Telegraph System
dynamic loudspeaker	Dynamic Loudspeakers
dynamic microphone	The Moving-Coil or Electrodynamic (Dynamic) Microphone
dynamic state	Production of Electromagnetic Waves