Welcome to My Website


when was the first mobile phone invented

Posted by Techy Saturday, August 8, 2009

Mobile phones have brought about a dramatic change to the communication industry. The development of mobile phones has made long-distance communication a matter of seconds. Who was the genius to invent the first mobile phone and when was it invented?

Who invented the mobile phone ?
when was the first mobile phone invented?
Here is the history of mobile phones.
Not only history of mobile phones but also history and development of mobile phones.

The mobile phone was invented in 1973 by Dr. Martin Cooper, a Motorola employee. On April 3, 1973, the first cell phone call was made. The caller was naturally, Dr. Cooper himself. The receiver of the first mobile phone call was Joel Angel, the research head at AT&T’s Bell Labs and rival of Dr. Cooper.

Prior to the development of mobile phones, people used two-way radios to communicate while they were mobile. The idea behind two-way radios gave rise to the invention of mobile phones. During the 1940s, Motorola came up with the Walkie-Talkie followed by handheld two-way radios that operated on battery power.

In 1947, Douglas Ring and W. Rae Young at Bell Labs introduced the idea of hexagonal cells for mobile phones. Philip Porter at Bell Labs came up with the idea that the cell towers should be at the corners of the hexagonal cells and not at their centers. He also proposed that the cell towers should have directional antennas.

Top of cellular telephone tower

Ericsson came up with an automatic mobile phone system, which was released in Sweden in 1956. It was known as MTA and did not require manual control. The drawback of this system was that the phones weighed 40 kgs. The year 1965 witnessed the introduction of a revised mobile phone technology that was based on DTMF signaling and used lighter mobile phones. Till 1970, mobile phones had to remain within their cell area and there were no means to continue communication while switching between cell areas. The call handoff system that allows users to move through different cell areas came up only in 1970. It's invention is attributed to Amos E. Joel, Jr, a Bell Labs engineer. The ARP network in Finland, established in 1971, boasts of being the first successful commercial mobile phone network. You may like to know more...........

In 1910 Lars Magnus Ericsson installed a telephone in his car, although this was not a radio telephone. While travelling across the country, he would stop at a place where telephone lines were accessible and using a pair of long electric wires he could connect to the national telephone network.[citation needed] In 1946 soviet engineers G. Shapiro and I. Zaharchenko successfully tested their version of a radio mobile phone mounted inside a car. The device could connect to local telephone network on a range up to 20 kilometers. In December 1947, Douglas H. Ring and W. Rae Young, Bell Labs engineers, proposed hexagonal cells for mobile phones in vehicles.[1] Philip T. Porter, also of Bell Labs, proposed that the cell towers be at the corners of the hexagons rather than the centers and have directional antennas that would transmit/receive in 3 directions (see picture at right) into 3 adjacent hexagon cells.[2] [3] The technology did not exist then and the frequencies had not yet been allocated. Cellular technology was undeveloped until the 1960s, when Richard H. Frenkiel and Joel S. Engel of Bell Labs developed the electronics.

Two 1991 GSM mobile phones

Recognizable mobile phones with direct dialing have existed at least since the 1950s. In the 1954 movie Sabrina, the businessman Linus Larrabee (played by Humphrey Bogart) makes a call from the phone in the back of his limousine.

The first fully automatic mobile phone system, called MTA (Mobile Telephone system A), was developed by Ericsson and commercially released in Sweden in 1956. This was the first system that did require any kind of manual control, but had the disadvantage of a phone weight of 40 kg (90 lb). MTB, an upgraded version with transistors, weighing 9 kg (20 lb), was introduced in 1965 and used DTMF signaling. It had 150 customers in the beginning and 600 when it shut down in 1983.

In 1957 young soviet radio engineer Leonid Kupriyanovich from Moscow created the portable mobile phone, named after himself as LK-1 or "radiophone".[4] This true mobile phone consisted of a relatively small-sized handset equipped with an antenna and rotary dial, and communicated with a base station. Kupriyanovich's "radiophone" had 3 kilogram of total weight, could operate up to 20 or 30 kilometers, and had 20 or 30 hours of battery lifespan. LK-1 and its layout was depicted in popular soviet magazines as "Nauka i zhizn", 8, 1957, p. 49, "Yuniy technik", 7, 1957, p. 43-44. Engineer Kupriyanovich patented his mobile phone in the same year 1957 (author's certificate (USSR Patent) # 115494, 1.11.1957). The base station of LK-1 ( called ATR, or Automated Telephone Radiostation) could connect to local telephone network and serve several customers.

In 1958, Kupriyanovich resized his "radiophone" to "pocket" version. The weight of improved "light" handset was about 500 gram.

In 1958 the USSR also began to deploy the "Altay" national civil mobile phone service specially for motorists. The newly-developed mobile telephone system was based on Soviet MRT-1327 standard. The main developers of the Altay system were Voronezh Science Research Institute of Communications (VNIIS)and the State Specialized Project Institute (GSPI). In 1963 this service started in Moscow, and in 1970 the Altay service already was deployed in 30 cities of the USSR. The last upgraded versions of the Altay system are still in use in some places of Russia as a trunking system.

In 1966, Bulgaria presented the pocket mobile automatic phone RAT-0,5 combined with a base station RATZ-10 (RATC-10) on Interorgtechnika-66 international exhibition. One base station, connected to one telephone wire line, could serve up to 6 customers.

In 1967, each mobile phone had to stay within the cell area serviced by one base station throughout the phone call. This did not provide continuity of automatic telephone service to mobile phones moving through several cell areas. In 1970 Amos E. Joel, Jr., another Bell Labs engineer,[5] invented an automatic "call handoff" system to allow mobile phones to move through several cell areas during a single conversation without loss of conversation.

In December 1971, AT&T submitted a proposal for cellular service to the Federal Communications Commission (FCC). After years of hearings, the FCC approved the proposal in 1982 for Advanced Mobile Phone Service (AMPS) and allocated frequencies in the 824-894 MHz band.[6] Analog AMPS was superseded by Digital AMPS in 1990.

One of the first successful public commercial mobile phone networks was the ARP network in Finland, launched in 1971. Posthumously, ARP is sometimes viewed as a zero generation (0G) cellular network, being slightly above previous proprietary and limited coverage networks.

Source Wiki And Buzzle


Post a Comment

What You Want