CCIR System L

Analog TV systems global map, with System L in magenta.

CCIR System L is an analog broadcast television system used in France, Luxembourg, Monaco and Chausey.^[1][2][3] It was the last system to use positive video modulation and AM sound.^[3]

Initially adopted in the 1970s and associated with the SECAM color system (SECAM-L), it was discontinued in 2011, when France transitioned to Digital Video Broadcasting.

Specifications

Spectrum of a SECAM-L color television signal

The main System L specifications are listed below.^[4][1][5]

• Frame rate: 25 Hz
• Interlace: 2/1
• Field rate: 50 Hz
• Lines/frame: 625
• Line rate: 15625 Hz
• Visual bandwidth: 6 MHz
• Vision modulation: Positive
• Sound modulation: AM
• Sound offset: -6.5 MHz
• Channel bandwidth: 8 MHz

Plan showing VHF frequency ranges for ITU Systems

Television channels were arranged as follows:^[6][7]

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

1. Documents of the XIth Plenary Assembly - Oslo, 1966 - Volume V - Sound Broadcasting Television (PDF). International Telecommunication Union. 1967.
2. "World Analogue Television Standards and Waveforms". August 30, 2012. Archived from the original on 30 August 2012.
3. "Weltweite Fernsehsysteme (NTSC, PAL und SECAM)". www.paradiso-design.net. 2019. Retrieved 2023-03-06.^{[permanent dead link]}
4. Reference Data for Radio Engineers, ITT Howard W.Sams Co., New York, 1977, section 30
5. "World Analogue Television Standards and Waveforms". 2007-05-15. Archived from the original on 2007-05-15. Retrieved 2023-04-13.
6. "CCIR Systems - Radio Channels: System-L - France". www.pembers.freeserve.co.uk. Archived from the original on 30 August 2012. Retrieved 12 January 2022.
7. "CCIR Systems - Radio Channels: Systems B, D, G, I, K, L 625 lines 7/8MHz, cable distribution, Europe". www.pembers.freeserve.co.uk. Archived from the original on 30 August 2012. Retrieved 12 January 2022.

External links

• ITU, Characteristics of television systems
• World Analogue Television Standards and Waveforms
• Fernsehnormen aller Staaten und Gebiete der Welt^{[permanent dead link]}