Geneva Frequency Plan of 1975

The Geneva wave plan is the 1974/75 worked out in Geneva rules, in which the operation of the radio station was established in the long and medium waveband.

History

The first Geneva wave plan occurred on 14 November 1926 in force, he saw for 99 channels in the medium wave range of 500 kHz to 1500 kHz before a frequency raster of 10 kHz. After an interim arrangement (9 kHz steps below 1000 kHz, 10 kHz above) in Brussels January 13, 1929, the frequency spacing of 500 kHz was set to 1300 kHz to 9 kHz by a decision taken in Prague agreement on 30 June 1929 between 1300 kHz and 1500 kHz it was 10 kHz steps in the. Specified for 1927 in Washington, DC long wave range between 150 kHz and 224 kHz channel spacing have been agreed between 7 kHz and 10 kHz.

Other arrangements have been made in 1932 in Lucerne and 1948 in Copenhagen.

The Geneva wave plan was necessary because there were more and more mutual interference by the plurality of transmitters in these frequency ranges. He resigned on November 23, 1978 for the center shaft into force and is valid with minor modifications by mutual coordinations today.

For the long-wave range, a separate conversion scheme was made ​​because in this frequency range and other wireless services have rights and this time had to be allowed to adjust their transmission frequencies. The changeover took place later and in 3 sections: 148.5 to 193.5 kHz at 1 February 1986, from 193.5 to 238.5 kHz at 1 February 1988, from 238.5 to 283.5 kHz at 1 February 1990.