RKS Liblice 2
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The RKS Liblice 2 are two tall
guyed A guy-wire, guy-line, guy-rope, or stay, also called simply a guy, is a tensioned cable designed to add stability to a free-standing structure. They are used commonly for ship masts, radio masts, wind turbines, utility poles, and tents. A thi ...
masts located east of Prague near Liblice, in close proximity of the
RKS Liblice 1 RKS Liblice 1 was a facility for commercial long wave radio transmission located in the Czech Republic about east of Prague near Liblice. It used a T-antenna hung on two tall insulated towers built of lattice steel. The towers were demolished by ...
. These lattice steel towers are built apart from each other, what formed a slightly directional radiation pattern directed towards Spanish Madrid transmitter on the same frequency. The masts carry a special anti-fading cage aerials. Designed by Jan Šťovíček, these supertall towers currently stand as the tallest towers in the world used for broadcasting in the medium-wave range. RKS Liblice-2 was built in 1976, and is used for broadcasting on 639 kHz, with a period of inactivity from January 2022 to September 2023. During construction, two new transmitter devices of the type ''Tesla SRV 750'' with an output power of 750 kW were installed. At first, these transmitters were switched in parallel for a transmission power of 1500 kW, after 1990 only 750 kW was used for broadcasting. Since 2023, the transmitter broadcasts with only 20 kW of power, a significant lowering. The old transmitter device was replaced with a semiconductor type ''TRAM'' one.


History

The Blaw-Knox RKS Liblice was tall tower before it was demolished on August 11, 2004, in lieu of the construction of the current towers. The original tower were built in 1936, by Karlova Huť; these towers survived World War II without damages.


Events

* On November 23, 1978, the transmission frequency of the new towers, which was 638
kHz The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose expression in terms of SI base units is s−1, meaning that on ...
since 1950, was changed to 639 kHz in order to fulfill the regulations of "waveplan" of Geneva. * On August 27, 2005, a skydiver jumped off one of the masts after gaining illegal access to it. His parachute became accidentally hooked to a backstage insulator. Fortunately, the incident did not get him too close to the cage antenna of the tower, which would likely have led to his death due to the presence of high frequency currents. * The broadcasts of Czech Radio Prog. 2 ceased at midnight of New Year's Day 2022. * Since September 27, 2023, Country Radio, a private station, broadcasts through this transmitter, replacing the old ''RKS Zbraslav'' one, therefore moving from 1062 to 639 kHz. However, it operates at a greatly reduced power of only 20 kW.


See also

* List of masts * List of tallest structures in Czechia * List of twin buildings and structures


External links


Technical data (Czech)



Schema of first tower

Schema of second tower
* * http://www.prostor-ad.cz/pruvodce/pvychod/cbrod/vysilac.htm
{{DEFAULTSORT:Rks Liblice 2 Liblice Radio masts and towers in Europe Kolín District 1976 establishments in Czechoslovakia