CCIR System K

CCIR System K is an analog broadcast television system used in countries that adopted CCIR System D on VHF, and in Benin, Guinea, Republic of the Congo, Togo, Senegal, Burkina Faso, Burundi, Ivory Coast, Gabon, Comoros, Democratic Republic of the Congo, Madagascar, Mali, Nigeria, Réunion, Rwanda, Chad, Central African Republic, French Polynesia, New Caledonia, Wallis and Futuna, Guadeloupe, Martinique, Saint Pierre and Miquelon and French Guiana.^[1]

Analog TV systems global map, with System K in pink.

It is identical System D in most respects.^[2][3][1] Used only for UHF frequencies, its paired with SECAM or PAL color systems.

Specifications

Some of the important specs are listed below.^[4][2][5]

• 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: Negative
• Preemphasis: 50 μs
• Sound modulation: FM
• Sound offset: +6.5 MHz
• Channel bandwidth: 8 MHz

Television channels were arranged as follows:^[3]

System K 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

System K1

Plan showing VHF frequency ranges for ITU Systems

French overseas departments and territories used a variation named System K1 for broadcast in VHF.^[6] UHF channels were similar to K.^[3]

System K1 VHF channels

Channel	Video carrier (MHz)	Audio carrier (MHz)
2	52.25	58.75
3	60.25	66.75
4	175.25	181.75
5	183.25	189.75
6	191.25	197.75
7	199.25	205.75
8	207.25	213.75
9	215.25	221.75
10	223.25	229.75

See also

• Broadcast television systems
• Television transmitter
• Transposer