P1G

- Wireless technology uses electromagnetic radiation.

- The advantages of wireless technology are:

• No external/direct connection to a telephone needed
• Portable and convenient
• Allows access when on the move

- The advantages of DAB radios are:

• More stations available
• Less interference with other broadcasts

- The disadvantages of DAB radios are:

• Poorer quality compared to FM.
• Not all areas covered.

- Radiation used for communication is refracted and reflected and this can be an advantage or disadvantage for good reception.

- Wireless technology: TV, Mobile phones, Radio, Laptops.

- Radio waves exhibit total internal reflection.

- Communication to and from satellites uses microwaves. But the wavelengths need to pass easily through the Earth's atmosphere without too much absorption.

- The signal from a transmitter is transmitted into space where it's picked up by the satellites receiver dish orbiting thousands of kilometres above the Earth in a different direction where it is received by a satellite dish on the ground. 

- Mobile phone calls travel as microwaves from your phone to the nearest transmitter (mast). The transmitters pass signals between each other, then back to your mobile phone.