180-line is an earlyelectronic television system. It was used inGermany after March 22, 1935, usingtelecine transmission of film,intermediate film system, or cameras using theNipkow disk. Simultaneously, fully electronic transmissions using cameras based on theiconoscope began on January 15, 1936, with definition of375 lines.
TheBerlinSummer Olympic Games were televised,[2] using bothclosed-circuit 375-line fully electronic iconoscope-based cameras and 180-line intermediate film cameras[3] transmitting to Berlin,Hamburg,Munich,Nuremberg, andBayreuth via specialReichspost long-distance cables in August 1936. In Berlin, twenty-eight public 180-line television rooms were opened for anybody who did not own a television set.
| 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-line | 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 |
SomeTV sets for this system were available, including theFrench Grammont models,[5][6]Telefunken FE II[1] and FE III,[7] andFernseh Tischmodell[8]
After February 1937, both 180- and 375-line systems were replaced by a superior,441-line system.
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