Due to an increase in unlicensed radio stations and illegal operations by licensed radio stations, there has been a rise in the level of disturbance and interference on legitimately used radio waves. Many complications have arisen from unwanted radio waves, such as malfunctions caused by the proliferation of digital and electronic equipment.
Damage caused by radio waves can, in some instances, be life threatening. The Ministry of Internal Affairs and Communications thus responds swiftly to eliminate the source of interference when an interference or disturbance report is filed.

1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Interference related to important radio communications | 520 | 428 | 459 | 493 | 460 | 420 | 404 | 541 | 494 | 585 | 429 | 566 | 592 | 674 | 684 | 512 | 532 |
Others | 1,467 | 2,058 | 2,174 | 2,188 | 2,190 | 2,067 | 2,104 | 1,579 | 1,385 | 1,432 | 1,205 | 1,533 | 1,711 | 1,991 | 2,344 | 2,364 | 2,241 |
Total | 1,987 | 2,486 | 2,633 | 2,681 | 2,650 | 2,487 | 2,508 | 2,120 | 1,879 | 2,017 | 1,634 | 2,099 | 2,303 | 2,665 | 3,028 | 2,876 | 2,773 |
2,773 interference reports were filed, 103 cases (9.6%) less compared to the previous year
Of those, 532 cases were related to important radio communications, 20 cases (3.9%) more compared to the previous year
- (Note)
"important radio commmunications" refer to telecommunication services, broadcast services, saving human life or assets or maintaining safety, weather services, electric services, railway services.

1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Violation of the Radio Regulatory Laws | 87 | 74 | 51 | 48 | 10 | 18 | 47 | 7 | 7 | 1 | 2 | 1 | 10 |
Explanation(advice) | 262 | 248 | 223 | 148 | 131 | 127 | 114 | 122 | 139 | 131 | 117 | 127 | 141 |
Extioction | 738 | 639 | 584 | 500 | 526 | 534 | 514 | 639 | 652 | 629 | 667 | 667 | 689 |
Information | 1,000 | 725 | 923 | 680 | 461 | 497 | 472 | 535 | 522 | 656 | 695 | 930 | 686 |
Other | 494 | 303 | 666 | 484 | 670 | 755 | 585 | 718 | 835 | 986 | 1,264 | 1,454 | 1,246 |
Total | 2,581 | 1,989 | 2,447 | 1,860 | 1,798 | 1,931 | 1,732 | 2,021 | 2,155 | 2,403 | 2,745 | 3,179 | 2,772 |