5.1 TELECOMMUNICATION SYSTEMS PART 1 Flashcards
OHAAA PART 1 SA KAY GA LAG NA ANG PAGE
Used to convey messages from about 700 B.C.E.
Carrier pigeons
It is where the first long-distance communication systems were based on (e.g. drums and horns, smoke signals and beacon fires).
Signals of sound and light
alerted the British of the arrival of the Spanish Armada in 1588 C.E.
Signal fires
Signal fires alerted the British of the arrival of the ____________ in _______ C.E.
Spanish Armada, 1588
They used rockets as signals to warn of an imminent attack on the Great Wall.
The Chinese! CHING CHONG MADAFAKA!
communicated by covering and uncovering a bonfire with a blanket to produce smoke signals or by beating drums.
Native Americans
Used in traditional long-distance communication until almost 1800
Horse-mounted dispatch riders
_____________________ Developed an optical telegraph (semaphore) system of stations built on rooftops or towers that were visible from a great distance in _______.
Frenchman Claude Chappe, 1793
It consisted of a column-like tower with a moveable beam. Attached to the beam were two moveable arms. The beam and arms were swiveled with ropes, conveying different signal patterns representing upper- and lowercase letters, punctuation marks, and numbers.
Semaphore Stations
The semaphore station system allowed the French to send a concise message over _____ miles (____ km) in less than 5 minutes, as long as visibility was good.
100 miles, 160 kilometers
He developed another type of optical telegraph system with ten collapsible iron shutters, which, when placed in various positions, formed combinations of numbers that were translated into letters, words, or phrases.
Swere A.N. Edelcrantz
He transmitted the first practical electrical signal in 1830 by sending electricity through a long set of wires to produce electromagnetism that was used to ring a bell.
Joseph Henry
He patented the first functional electrical communication system in 1831: the electric telegraph with its system of electrical impulses identified as dots and dashes that eventually became known as Morse Code.
Samuel Morse
The first message sent by electric telegraph
“What hath God wrought”
The first message sent by the electric telegraph was from the Supreme Court Room in the U.S. Capitol to the railway depot at Baltimore on ___________ (date)
May 24, 1844
In 1861, there were over _____ telegraph offices in operation across America and the East and West coasts were connected.
2000
In what year was the first transatlantic cable laid, connecting England and the United States.
1867
Invented an electrical speech machine that transmitted voice over wires and became known as the telephone, on March 10, 1876, in Boston, Massachusetts.
Alexander Graham Bell
When and where did Alexander Graham Bell invent the telephone?
March 10, 1876
Boston Massachusetts
The first words accidentally spoken into the telephone.
“Mr. Watson, come here, I want you!”
In 1880, the first telephone company, __________, was formed and over 30,000 phones were in use.
American Bell
Within 40 years after the first telephone company was formed (about 1920), over _______________ American Bell System telephones were in service.
ten million
Italian inventor who demonstrated the first radio transmission in 1895 that was received out of a line of sight (about 2 miles) on the grounds of his family estate in Italy.
Gugliemo Marconi
Six years after Marconi demonstrated the first radio transmission in Newfoundland Canada, Marconi’s radio received a weak signal that was sent across the Atlantic Ocean by one of his associates in Cornwall, England. The signal was an “__” sent in Morse Code format, “dot, dot, dot.”
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