Grace_Brandt_Eddie_Albert_Grace_and_Eddie_The_Honeymooners_Show_1937

343-line is the number of scan lines in some early electronic monochrome analog television systems. Systems with this number of lines were used with 30

interlaced Interlaced video (also known as interlaced scan) is a technique for doubling the perceived frame rate of a video display without consuming extra bandwidth. The interlaced signal contains two fields of a video frame captured consecutively. This ...

frames per second the

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...

by from 1935 to 1938, and with 25 interlaced frames per second in the

Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen national ...

from 1937 onwards. A similar system was under development in

Poland Poland, officially the Republic of Poland, is a country in Central Europe. It is divided into 16 administrative provinces called voivodeships, covering an area of . Poland has a population of over 38 million and is the fifth-most populous ...

in 1939. TV cameras where based on the

iconoscope The iconoscope (from the Greek: ''εἰκών'' "image" and ''σκοπεῖν'' "to look, to see") was the first practical video camera tube to be used in early television cameras. The iconoscope produced a much stronger signal than earlier mecha ...

, the primary camera tube used in American broadcasting from 1936 until 1946, when it was replaced by the image

orthicon Video camera tubes were devices based on the cathode ray tube that were used in television cameras to capture television images, prior to the introduction of charge-coupled device (CCD) image sensors in the 1980s. Several different types of tubes ...

tube. Earlier cameras used special spotlights or spinning disks to capture light from a single very brightly lit spot, and were not suitable for broadcasting of outdoor live events. This early standard was soon replaced by 441-line systems.

United States

343-line broadcasts where introduced by RCA and NBC on November 6, 1936. Tests started the previous year from

New York City New York, often called New York City or NYC, is the List of United States cities by population, most populous city in the United States. With a 2020 population of 8,804,190 distributed over , New York City is also the L ...

(W2XF on the

Empire State Building The Empire State Building is a 102-story Art Deco skyscraper in Midtown Manhattan, New York City. The building was designed by Shreve, Lamb & Harmon and built from 1930 to 1931. Its name is derived from "Empire State", the nickname of the st ...

), where NBC converted a radio studio in the Rockefeller Center for television use. Several prototype TV sets were produced by RCA in 1936, but none was available commercially. Broadcasts were limited to public demonstrations in New York City (RCA) and

Philadelphia Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Sinc ...

( Philco) - to be exact, Philco demonstrated a 345-line system, but in practice both systems were identical. The 343-line system was proposed for FCC approval by the Radio Manufacturers Association (RMA) in December 1937. Broadcasts were phased out the following year, in favor of a 441-line system. Technical details:

Soviet Union

A a similar 343-line system was tested in the Soviet Union (

Moscow Moscow ( , US chiefly ; rus, links=no, Москва, r=Moskva, p=mɐskˈva, a=Москва.ogg) is the capital and largest city of Russia. The city stands on the Moskva River in Central Russia, with a population estimated at 13.0 million ...

) from 1937 onwards. RCA provided broadcast equipment and documentation for the TV sets, that were then produced locally. The system was adapted for 50 Hz mains electricity, with a field rate of 50 Hz. The first experimental transmissions happened on March 9, 1937, followed by regular broadcasts on December 31, 1938.

Poland

In 1939 a 343-line system was under development in Poland, publicly demonstrated during the

Warsaw Warsaw ( pl, Warszawa, ), officially the Capital City of Warsaw,, abbreviation: ''m.st. Warszawa'' is the capital and largest city of Poland. The metropolis stands on the River Vistula in east-central Poland, and its population is officia ...

Radio Exhibition on August. Regular operations were planned for the beginning of 1940, but work stopped due to the outbreak of

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...

References

{{Analogue TV transmitter topics Television technology History of television