18.3 1 radio waves radio waves are
the frequency range 104 - 109 Hz (Hz) used in the radio communication system 2 is the transmission system is
1.1 am (A. M. =amplitude modulation)
The AM frequency range 530 - 1600 kHz (kilohertz) communicate using sound waves mixed into the radio waves called "carrier wave" by the amplitude of the carrier signal to change sound waves
in the waves A system. M.You can send a wave wave wave, moving in a straight line parallel to the skin and the world blue waves, waves will be reflected on the first floor to the atmosphere, and then reflects back to สเฟียร์ came down so they do not need to use the antenna set up an FM system
1.2 (F.M. =frequency modulation)
the FM frequency range 88 - 108 MHz (megahertz) communicate using sound waves mixed into the carrier by Carrier frequency signals will be changed in accordance with sound waves
to send F system. M.Send waves waves are only a single land area to be covered, if you want to send a broadcast antenna and the receiver must be set high-receive.
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