What is spread spectrum?
Q: What is spread spectrum?
A: Spread spectrum is a method in radio and other kinds of telecommunication that overcomes interference, noise and jamming of signals.
Q: When did wireless telegraphy become possible?
A: Wireless telegraphy became possible in the later 19th century.
Q: Why is spread spectrum necessary?
A: Spread spectrum is necessary to reduce interference with radio direction-finding, which is widely used in civil and military aviation.
Q: How was radio communication used in World War II?
A: Radio communication was used in World War II for intercepting the enemy's radio communications and interfering with their transmission.
Q: What do spread spectrum systems do?
A: Spread spectrum systems transmit messages using a bandwidth that is wider than the bandwidth actually needed by the message signal.
Q: Why does spread spectrum make a wideband signal appear as a noise signal?
A: Spread spectrum makes a wideband signal appear as a noise signal to resist intentional and unintentional interference with the transmitted signal.
Q: Can radio receivers emit signals?
A: Yes, radio receivers also emit signals, making those who are listening detectable.
