Prague 1929[4] (effective 30 June 1929) "European Radio-electric Conference of Prague 1929" 9kHz spacings on MW (10kHz above 1400kHz);
Madrid/Lucerne 1932[5] (effective 15 January 1934) "Lucerne Convention European Wavelength Plan" Mostly 9kHz spacings but not harmonic multiples;
Montreux 1939 (was to be effective 1940 but never implemented due to World War II[6][7]);;
Copenhagen 1948[8][9][10] (effective 15 March 1950) "European LW/MW Conference Copenhagen 1948 (European broadcasting convention)" Mostly 9kHz (8kHz above 1529kHz; 7, 8, and 9kHz on LW) spacings but not harmonic multiples—offset 1kHz on MW and (generally) 2kHz on LW.
A vintage European radio set with a dial marked according to the Copenhagen Plan of 1948
↑"Government regulations and state monopolies". Offshore Radio Museum. Retrieved 1 January 2017.
↑"New medium- and long-wave broadcasting plan"(PDF). Wireless World. January 1976. p.42.
↑Smith, Mike. "UK Radio: A Brief History – Part 3". MDS975. Archived from the original on 6 November 2016.
↑"The Prague Broadcasting Frequency Plan"(PDF). Radio Service Bulletin (146). United States Department of Commerce Radio Division: 25. 31 May 1929. Archived from the original(PDF) on 4 March 2016.
↑McCarthy, Clive (28 May 2007). "Development of the A.M. Transmitter Network, Rev 6a"(PDF).
↑Verdijk, Jan. "Zenderindeling volgens Kopenhagen 1948"[Transmitter Classification according to Copenhagen 1948] (in Dutch). Archived from the original on 17 November 2007.
ブルマー、ウォルター。「Die Lang- und Mittelwellensender in Europa, Nahost und Afrika bei der Umstellung nach dem Genfer Wellenplan am 23.11.1978 inkl. der Neukoordinierungen」[ 1978 年 11 月 23 日のジュネーブ周波数計画への移行期にあるヨーロッパ、中東、アフリカの長波および中波放送局 (新しい調整を含む) ] (PDF) (ドイツ語)。