TELECOM Transmitting Of Radio Waves Flashcards
Microwaves, telephone and radio signals,are waves which carry _____
Energy
Give examples of long range communication
Mobile telephones, radio and televisions
What speed to microwaves, telephone and radio waves travel at?
3x10*8
How can radio transmitter (eg radio 1) be identified?
Wavelength of frequency calues
What are curved reflectors used for?
To increase strength of a signal
Why do curved reflectors make the signal stronger?
They collect the signal over a large area and bring it to a focus (detector placed here)
What are curved reflectors used for?
Satellite tv, boosters, satellite communication
What doe don’t experiment of the satellite depend on?
The orbit
What are geostationary satellites?
Satellites at stay about one point on the earth/period of 24hr
_____ send signals to satellites using a ____ transmitor to transmit a strong signal. At the satellite the is signal is collected by a ______ them amplified and retransmitted bout to the ground using a _______
GROUND STATIONS send signals to satellites using a CURVED DISH REFLECTOR transmitor to transmit a strong signal. At the satellite the is signal is collected by a CURVED DISH RECEIVER them amplified and retransmitted bout to the ground using a CURVED DISH RECEIVER
What happens in satellite television systems?
The signal is broadcast over wide areas and collected by dish aerials on people’s homes
How is intercontinental communication done?
Three geostationary satellites, with each satellite communications with ground stations on each continent
What is diffraction?
The bending of light around objects
Longer wave lengths diffract _____ than shorter wavelengths
Longer wave lengths diffract more than shorter wavelengths
Radio waves have ____ wavelengths than television waves so bend round objects(hills) _____
Radio waves have LONGER wavelengths than television waves so bend round objects(hills) MORE EASILY
