As long as a radio signal is shooting from one place to another through space, it's
a wave of electromagnetic fields. Once it hits an electrical conductor ... like a piece
of wire that happens to be part of an antenna (aerial) ... the electromagnetic fields
set up a small electric current in the conductor, and the signal has been "captured".
That small electric current runs directly into electronic equipment that's used to make
the current stronger, pick out the one single frequency from all the hundreds or
thousands of separate signals that have set up currents in the antenna as they
passed by, then make that one stronger again, and eventually strip the information
from it, and use the information to reconstruct the sound of a song, the voice of
a newscaster or a cellphone caller, a TV picture, the data off of the Wifi in your
house, or the data from ten different satellites for the GPS unit on your dashboard.
One of the primary goals of the art and science of antenna design is to squeeze
the maximum antenna current out of that incredibly weak electromagnetic signal
as it flies by.
Long wave radio signals are picked up by long antennas.
Broadcast Radio
so people could communicate over long distances
broadcast
The first radio was invented by gugliemo marconi but jc Bose who first showed that radio signals could be sent over long distances without wires. Radio was invented in i921.Ansered byvaibhav gupta
By 1937, radio had long been known as "radio." But if you had been around in the early 1920s, radio was called a number of things-- wireless, wireless telephone, radiophone, and radio telephone. By the mid-1920s, however, the other words had fallen out of use, and radio was in fact only called "radio." What is interesting about 1937 is that FM was beginning to get into the news. In radio's first several decades, all stations were on AM. But in the late 1930s, inventor Edwin Howard Armstrong was demonstrating his new way of broadcasting-- which was generally referred to as "static-free radio"-- since AM signals tended to pick up all kinds of interference from the atmosphere, whereas FM signals did not.
How do THEY get back to earth?!
Amplitude Modulation and Frequency Modulation. They are different methods of transmitting radio signals. AM is good for transmitting radio signals long distance FM is good for transmitting radio signals short distances but better quality
Broadcast Radio
Broadcast Radio
Earth has been broadcasting radio signals into outer space since the late 1800's.
so people could communicate over long distances
5years
This might be a description of a radio antenna.
broadcast
i think.... and i only think this, it may not be correct, an antenna transmits as well as receives, an aerial only receives there is no difference between antenna and aerial. According to British spelling it is called Aerial and according to American English antenna. So there is no difference just the English In the U.S. sometimes antenna is used for rigid structures used to transmit or receive radio signals, while aerial is used for a simple wire hung between insulators used to transmit or receive radio signals.
Radio signals on Earth have been travelling outwards for almost 100 years, but the range is not very great because they go below the level of galactic noise quite quickly as they spread out.
The first radio was invented by gugliemo marconi but jc Bose who first showed that radio signals could be sent over long distances without wires. Radio was invented in i921.Ansered byvaibhav gupta