Grace_Brandt_Eddie_Albert_Grace_and_Eddie_The_Honeymooners_Show_1937

343-line is the number of

scan lines A scan line (also scanline) is one line, or row, in a raster scanning pattern, such as a line of video on a cathode-ray tube (CRT) display of a television set or computer monitor. On CRT screens the horizontal scan lines are visually discernib ...

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. Th ...

frames per second A frame is often a structural system that supports other components of a physical construction and/or steel frame that limits the construction's extent. Frame and FRAME may also refer to: Physical objects In building construction *Framing (co ...

by the

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

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

Soviet Union The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...

from 1937 onwards. A similar system was under development in

Poland Poland, officially the Republic of Poland, is a country in Central Europe. It extends from the Baltic Sea in the north to the Sudetes and Carpathian Mountains in the south, bordered by Lithuania and Russia to the northeast, Belarus and Ukrai ...

in 1939. TV cameras were based on the

iconoscope The iconoscope (from the Greek Language, 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 tha ...

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

orthicon Video camera tubes are 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 RCA Corporation was a major American electronics company, which was founded in 1919 as the Radio Corporation of America. It was initially a patent pool, patent trust owned by General Electric (GE), Westinghouse Electric Corporation, Westinghou ...

and

NBC The National Broadcasting Company (NBC) is an American commercial broadcast television and radio network serving as the flagship property of the NBC Entertainment division of NBCUniversal, a subsidiary of Comcast. It is one of NBCUniversal's ...

on November 6, 1936. Tests started the previous year from

New York City New York, often called New York City (NYC), is the most populous city in the United States, located at the southern tip of New York State on one of the world's largest natural harbors. The city comprises five boroughs, each coextensive w ...

(W2XF on the

Empire State Building The Empire State Building is a 102-story, Art Deco-style supertall skyscraper in the Midtown South neighborhood of Manhattan, New York City, United States. The building was designed by Shreve, Lamb & Harmon and built from 1930 to 1931. Its n ...

), where NBC converted a radio studio in the

Rockefeller Center Rockefeller Center is a complex of 19 commerce, commercial buildings covering between 48th Street (Manhattan), 48th Street and 51st Street (Manhattan), 51st Street in the Midtown Manhattan neighborhood of New York City. The 14 original Art De ...

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 ( ), colloquially referred to as Philly, is the List of municipalities in Pennsylvania, most populous city in the U.S. state of Pennsylvania and the List of United States cities by population, sixth-most populous city in the Unit ...

(

Philco Philco (an acronym for Philadelphia Battery Company) is an American electronics industry, electronics manufacturer headquartered in Philadelphia. Philco was a pioneer in battery, radio, and television production. In 1961, the company was purchase ...

) - 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 is the Capital city, capital and List of cities and towns in Russia by population, largest city of Russia, standing on the Moskva (river), Moskva River in Central Russia. It has a population estimated at over 13 million residents with ...

) 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 Mains electricity, utility power, grid power, domestic power, wall power, household current, or, in some parts of Canada, hydro, is a general-purpose Alternating current, alternating-current (AC) electric power supply. It is the form of electri ...

, 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, officially the Capital City of Warsaw, is the capital and List of cities and towns in Poland, largest city of Poland. The metropolis stands on the Vistula, River Vistula in east-central Poland. Its population is officially estimated at ...

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 (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...

References

{{Analogue TV transmitter topics Television technology