Radio
device · 1895 · Electric age
Transmitting signals with electromagnetic waves (Popov, Marconi).
What it is made of
- Amplifier — has part. Amplifying a weak signal.
- Oscillator — has part. A carrier frequency oscillator.
- Antenna — has part. An antenna.
Principles and materials it uses
- Electromagnetic waves — uses. The signal is carried by electromagnetic waves.
- Morse code — uses. The first radio transmissions were in Morse code.
- Copper — is made of. The wires and coils are copper.
Where it is used
- Sputnik 1 — is part of. It sent out a “beep-beep” radio signal.
- Radio broadcasting — is used in. Broadcasting by radio.
- Television — is used in. The image is transmitted by radio.
- Pager — is used in. Radio reception.
- Walkie-talkie — is used in. Radio communication.
- Air traffic control — is used in. Radio communication.
- Weather balloon — is part of. A radiosonde.
- Radio navigation — is used in. Radio beacons.
- Sonobuoy — is part of. A radio transmitter.
History: what it evolved from and what it influenced
- Mobile phone — evolved into. Mobile communication is a development of radiotelephony.
What it is a kind of
- Means of communication — is a kind of. A means of wireless communication.
- Transistor radio — includes. A radio receiver.
- Crystal radio — includes. A radio receiver.
- Car radio — includes. A radio receiver.
- Military radio — includes. Radio.