The Junglinster Longwave Transmitter is a longwave broadcasting facility used by RTL near Junglinster, Luxembourg, which went into service in 1932. Its aerial consists of three free-standing steel-framework towers, which are ground fed radiators. These towers formed a directional aerial for the frequency 234 kHz and until 1980 were 250 metres high. Since 1980 their height has been 215 metres.
Junglinster longwave transmitter was at time of inauguration one of the most powerful transmitters in the world. It was discovered that its signal can under some conditions show cross modulation with other radio stations by ionospheric reflection. This phenomenon was named "Luxembourg effect" after the circumstance that it was first detected at the signal of this transmitter in Luxembourg.
Since the inauguration of the Beidweiler longwave transmitter the Junglinster longwave transmitter has been only a spare.
Also at the site of Junglinster Longwave Transmitter are the shortwave transmitters of RTL, at the frequencies 6090 kHz and 15350 kHz were used. Transmitting on 6090 kHz, it is of special interest as it was (until the 80s) one of the best known radio stations in Germany and several radio sets had a special switch for its reception, the so-called "Luxembourg"-switch.Today this transmitter works in DRM mode.
From 1951 on the site of Junglinster Longwave transmitter was also the mediumwave transmitter. It moved to Marnach in 1955.
| Year | Longwave | Mediumwave | Shortwave | FM | Changes | |
|---|---|---|---|---|---|---|
| 1932 | 150 kW | - | - | - | Built of longwave transmitter with a transmitter of Chireix | |
| 1938 | - | - | 6 kW | - | First shortwave transmissions | |
| 1951 | 250 kW | - | - | - | Upgrade of longwave transmitter | |
| 1952 | - | 150 kW | - | - | First mediumwave transmissions | |
| 1953 | - | - | 50 kW | - | Second shortwave transmitter went in service | |
| 1954 | 500 kW | - | - | - | Installation of second longwave transmitter | |
| 1954 | - | - | - | - | Built of second antenna tower (height: 250 metres) | |
| 1955 | - | 0 | - | - | Mediumwave transmission moved to Marnach transmitter | |
| 1959 | - | - | - | 12 kW | First FM-transmitter went in service on 92.5 MHz | |
| 1959 | - | - | - | - | Built of third 250-metre tower | |
| 1960 | 750 kW | - | - | - | Inauguration of third longwave transmitter | |
| 1964 | 1000 kW | - | - | - | Replacement of first longwave transmitter by new 600 kW unit | |
| 1970 | - | - | 250 kW | - | Installation of new shortwave transmitter, built by Telefunken. The two old shortwave transmitters were kept as spare units | |
| 1971 | - | - | 500 | - | Installation of a second shortwave transmitter | |
| 1971 | - | - | - | 0 | FM-transmissions moved to FM- and TV-mast Hosingen | |
| 1973 | - | - | 500 + 50 | - | The old 50 kW shortwave transmitter went in service for broadcasting on 15350 kHz | |
| 1976 | - | - | 500 + 10 | - | Replacement of old 50 kW transmitter by a new 10 kW unit | |
| 1983 | - | - | - | - | The height of the towers is reduced from 250 metres to 216 metres | |
| 1987 | 1200 kW | - | - | - | Replacement of the 600 kW longwave transmitter from 1954 by a new 1200 kW transmitter from Thomson |