Katana VentraIP

CCIR System A

CCIR System A was the 405-line analog broadcast television system adopted in the UK and Ireland. System A service started in 1936 and was discontinued in 1985.

"System A" redirects here. For other uses, see Systema (disambiguation).

: 25 Hz

Frame rate

: 2/1

Interlace

: 50 Hz[1]

Field rate

Lines per : 405

frame

: 10.125 kHz[2]

Line rate

: 3 MHz

Visual bandwidth

: AC3 positive

Vision modulation

Preemphasis: none

Sound modulation: A3

Sound offset: −3.5 MHz

: 5 MHz

Channel bandwidth

Broadcast television systems

Television transmitter

Transposer

World Analogue Television Standards and Waveforms

Fernsehnormen aller Staaten und Gebiete der Welt

Analog TV Broadcast Systems

405-line TV in the Republic of Ireland

BBC Report on the state of Television in Southern Ireland