CCIR System L is an analog broadcast television system used in France, Luxembourg, Monaco, and Chausey. It was the last system to use positive video modulation and AM sound.

Initially adopted in 1963 for second national black and white public channel and officially associated with the SECAM color system (SECAM-L) in 1967, it was discontinued in 2011, when France transitioned to Digital Video Broadcasting.

Specifications

The main System L specifications are listed below:Reference Data for Radio Engineers, ITT Howard W.Sams Co., New York, 1977, section 30 Frame rate: 25 Hz Interlace: 2/1 Field rate: 50 Hz Lines/frame: 625 Line rate: 15.625 kHz Visual bandwidth: 6 MHz Vision modulation: Positive Preemphasis: 50 μs Sound modulation: AM Sound offset: -6.5 MHz Channel bandwidth: 8 MHz

Television channels were arranged as follows:

+ System L VHF channels Channel Video carrier (MHz) Audio carrier (MHz) 1 47.75 41.25 2 55.75 49.25 3 60.50 54.00 4 63.75 57.25 5 176.00 182.50 6 184.00 190.50 7 192.00 198.50 8 200.00 206.50 9 208.00 214.50 10 216.00 222.50

+ System L UHF channels Channel Video carrier (MHz) Audio carrier (MHz) 21 471.25 477.75 22 479.25 485.75 23 487.25 493.75 24 495.25 501.75 25 503.25 509.75 26 511.25 517.75 27 519.25 525.75 28 527.25 533.75 29 535.25 541.75 30 543.25 549.75 31 551.25 557.75 32 559.25 565.75 33 567.25 573.75 34 575.25 581.75 35 583.25 589.75 36 591.25 597.75 37 599.25 605.75 38 607.25 613.75 39 615.25 621.75 40 623.25 629.75 41 631.25 637.75 42 639.25 645.75 43 647.25 653.75 44 655.25 661.75 45 663.25 669.75 46 671.25 677.75 47 679.25 685.75 48 687.25 693.75 49 695.25 701.75 50 703.25 709.75 51 711.25 717.75 52 719.25 725.75 53 727.25 733.75 54 735.25 741.75 55 743.25 749.75 56 751.25 757.75 57 759.25 765.75 58 767.25 773.75 59 775.25 781.75 60 783.25 789.75 61 791.25 797.75 62 799.25 805.75 63 807.25 813.75 64 815.25 821.75 65 823.25 829.75 66 831.25 837.75 67 839.25 845.75 68 847.25 853.75 69 855.25 861.75

See also Broadcast television systems Television transmitter Transposer

Notes and references

External links ITU, Characteristics of television systems World Analogue Television Standards and Waveforms