-
Rad & Tv 1
Guglielmo Marconi sent the first successful transatlantic experimental radio communications. -
Rad & Tv 1
The invention of amplitude-modulated (AM) radio, so that more than one station can send signals is attributed to Reginald Fessenden and Lee de Forest. On Christmas Eve 1906, Reginald Fessenden used an Alexanderson alternator and rotary spark-gap transmitter to make the first radio audio broadcast, from Brant Rock, Massachusetts. -
Rad & Tv 1
Charles David Herrold, an electronics instructor in San Jose, California constructed a broadcasting station. Charles Herrold did not claim to be the first to transmit the human voice, but he claimed to be the first to conduct "broadcasting". To help the radio signal to spread in all directions, he designed some omnidirectional antennas, which he mounted on the rooftops of various buildings in San Jose. -
Rad & Tv 1
The most common type of receiver before vacuum tubes was the crystal set, although some early radios used some type of amplification through electric current or battery. Inventions of the triode amplifier, motor-generator, and detector enabled audio radio. -
Rad & Tv 1
During the mid-1920s, amplifying vacuum tubes (or thermionic valves in the UK) revolutionized radio receivers and transmitters. John Ambrose Fleming developed a vacuum tube diode. Lee de Forest placed a screen, added a "grid" electrode, creating the triode. -
Rad & Tv 1
In the 1930s, regular analog television broadcasting began in some parts of Europe and North America. By the end of the decade there were roughly 25,000 all-electronic television receivers in existence worldwide, the majority of them in the UK. -
Rad & Tv 1
Inventor Edwin Howard Armstrong is credited with developing many of the features of radio as it is known today. Armstrong patented three important inventions that made today's radio possible. Regeneration, the superheterodyne circuit and wide-band frequency modulation or FM. -
Rad & Tv 1
In the early 1960s, VOR systems finally became widespread for aircraft navigation; before that, aircraft used commercial AM radio stations for navigation. (AM stations are still marked on U.S. aviation charts). In 1960 Sony introduced their first transistorized radio, small enough to fit in a vest pocket, and able to be powered by a small battery. -
Rad & Tv 1
Internet radio (also web radio, net radio, streaming radio, e-radio, online radio, webcasting) is an audio service transmitted via the Internet. Broadcasting on the Internet is usually referred to as webcasting since it is not transmitted broadly through wireless means. -
Rad & Tv 1
From 2000 onwards, most Internet Radio Stations increased their stream quality as bandwidth became more economical. Today, most stations stream between 64 kbit/s and 128 kbit/s providing near CD quality audio
