180-line television system

The "Olympic-Cannon" 375 lines television camera at the 1936 Summer Olympics in Berlin, developed by [de] at Telefunken and operated by Walter Bruch (inventor of the PAL-system, seen here operating the camera) in parallel with the 180 lines disc-scanning cameras.

180 lines is an early electronic television system. It was used in Germany after March 22, 1935, using telecine transmission of film, intermediate film system, or cameras using the Nipkow disk. Simultaneously, fully electronic transmissions using cameras based on the iconoscope began on January 15, 1936 with a definition of 375 lines.

The Berlin Summer Olympic Games were televised,^[1] using both closed-circuit 375 lines fully electronic iconoscope-based cameras and 180 lines intermediate film cameras^[2] transmitting to Berlin, Hamburg, Munich, Nuremberg and Bayreuth via special Reichspost long distance cables in August 1936. In Berlin, twenty-eight public 180 lines television rooms were opened for anybody who did not own a television set. After February 1937 both 180 and 375 lines systems were replaced by a superior 441-line system.

System details:^[3]

System	Field frequency	Active picture	Field blanking	No. of broad pulses	Broad pulse width	Line frequency	Front porch	Line sync	Back porch	Active line time	Video/syncs ratio
180 lines	25 Hz	169 lines	11 lines	1 per field	200 μs	4500 Hz	2.2 μs	20.0 μs	2.2 μs	197.8 μs	75/25

References[]

External links[]

http://www.compulink.co.uk/~rrussell/tccgen/manual/tcgen0.html

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[1] ttps://stillmed.olympic.org/media/Document%20Library/Museum/Visit/TOM-Schools/Teaching-Resources/Broadcasting-the-Olympic-Games/FicheInfo_DiffusionJO_TV_ENG.pdf

[2] "Berlin Olympics Television 1936".

[3] "R.T.Russell: Colour Test Card Generator". bbcbasic.uk.

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