.
Keeping in touch
Broadcasting
Exchanging information
Entertainment by electronics
Distance and Language
Ignorance
Sixteenth
Eighteenth
Nineteenth
Twentieth
Free space
Water
Wires
Fiber optic cable
Adjacent channel overlap
Cross talk
Garbage-in-garbage-out
Noise
Amplified
Modulated
Attenuated
Interfered with
Another communications signal
Atmospheric effects
Manufactured electrical systems
Thermal agitation in electronic components
Half-duplex
Full duplex
Monocomm
Simplex
Half duplex
Full duplex
Bicomm
Simplex
Modulating signal
Carrier
Baseband signal
Source signal
Multiplexing
Telemetry
Detection
Modulation
Multiplexing
Telemetry
Mixing
Modulation
Baseband
Analog
Digital
Continuous wave
Demultiplexing
Modulation
Detection
Carrier Recovery
Television
CATV
Videotext
Facsimile
Telemetry
Instrumentation
Modulation
Multiplexing
Astrology
Optical astronomy
Radio astronomy
Space surveillance
Ham radio
Electronic bulletin board
CB radio
Cellular radio
Microwaves
A water medium
The directional nature of radio signals
Reflected radio signals
11m
27m
30m
81m
Voltage and currents
Electric and magnetic fields
Electrons and protons
Noise and data
30 to 300 Hz
300 to 3000 Hz
20 Hz to 20 KHz
0 Hz to 15 KHz
Microwaves
RF waves
Short waves
Millimeter waves
HF
EHF
VHF
UHF
Infrared rays
Microwaves
Shortwaves
X-rays