Dorjohn

= =  THE TELEVISION  Broadcasting stations give off broadcasting waves which the Television uses radiation to pick up on. The station broadcasts the waves into the air and they get picked up by the TV’s antenna. Broadcasting stations transmit broadcasting waves from an antenna to carry information to the antenna of your TV. The TV’s antenna changes these waves into an electric signal which is then changed into sound and picture. Sound and picture are both broadcasted to the TV. There are two ways for the stations to send out their radio waves Amplitude Modulation and Frequency Modulation. There are three different ways to transmit television waves, satellite TV which uses a satellite in space to send television signals to a receiving satellite usually found on your roof, cable TV is provided by radio waves being sent directly to the TV through a cable and watching TV by picking up the channels with your antenna from the radio waves which are being broadcasted to into the air from a broadcast tower. There are main ways of getting TV signals. Cable TV which radio waves are transmitted to your house by a proxy cable. Satellite TV uses a satellite to give us our TV. The last method is broadcasting and that is the only way of transmitting using radiation as you can see I said above.

FM FM stands for Frequency Modulation which is a way of transmitting signals by changing the frequency of the wave. Only the frequency of the wave changes but the amplitude stays relatively the same. Higher frequencies, higher energy mean that they can go through more objects. That's why FM waves can't travel as far as AM waves because they pass through the ionosphere. The ionosphere is a layer of the atmosphere that i charged with particles. Instead of being reflected back to Earth like AM waves they go through it. So if you go on a trip using a FM station you sometimes lose reception. Even so many radio stations use FM waves because they produce clearer and better sound. TV stations use FM waves for their sound. AM AM stands for Amplitude Modulation which is a way of transmitting signals by changing the amplitude of the wave. Unlike FM waves Am waves don't change their frequency they change only their amplitude. AM waves have a much lower frequency than FM waves so they stay within the ionosphere. AM waves can travel much father than FM waves but they don't have as good quality.



Effects On Your Health?  There has been speculation around the idea that TV’s give out X-rays that could be harmful to our health but these ideas have been proven to be incorrect. It has been said that we are completely safe from radiation sickness. Even though we are sure that there are no health effects from the X-rays we still want to make sure that that the amount of X-rays actually released are below radiation levels. UHF and VHF are the two terms used to measure the radiation levels. UHF stands for Ultra High Frequency which is more hazardous than VHF or Very High Frequency.

"Frequency-Modulation." Web. 25 Apr 2011. .

"Amplitude-Modulation." Web. 25 Apr 2011. .