wireless

A Technical Introduction
to वायरलेस

Wireless Systems:
History of Radio and Wireless Telephony
Wireless Systems:
History of Radio and Wireless Telephony
A Technical Introduction to Wireless
Chapter 1
MTS,
इम्ट्स

How Did We Get Here?
Days before radio.....
• 1680 Newton first suggested
concept of spectrum, but for
visible light only
• 1831 Faraday demonstrated that
light, electricity, and magnetism
are related
• 1864 Maxwell’s Equations:
spectrum includes more than light
• 1890’s First successful demos of
radio transmission
U N S
LF HF VHF UHF MW IR UV क्स्रय

October, 1997 Technical Introduction to Wireless -- 102 v1.0 - (c) 1997 Scott Baxter 1 - 4
Telegraphy

Samuel F.B. Morse had the idea of the telegraph on a
sea cruise in the 1833. He studied physics for two years,
and In 1835 demonstrated a working prototype, which he
patented in 1837.

Derivatives of Morse’ binary code are still in use today

The US Congress funded a demonstration line from
Washington to Baltimore, completed in 1844.

1844: the first commercial telegraph circuits were coming
into use. The railroads soon were using them for train
dispatching, and the Western Union company resold idle
time on railroad circuits for public telegrams, nationwide

1857: first trans-Atlantic submarine cable was installed
Samuel F. B. Morse
at the peak of his career
Field Telegraphy
during the US Civil War, 1860’s
Submarine Cable Installation
news sketch from the 1850’s