The Żórawina radio transmitter is a facility for FM

FM broadcasting

FM broadcasting is a broadcasting technology pioneered by Edwin Howard Armstrong which uses frequency modulation to provide high-fidelity sound over broadcast radio. The term "FM band" describes the "frequency band in which FM is used for broadcasting"...

 (and previously MW) transmission at Żórawina

Zórawina

Żórawina is a village in Wrocław County, Lower Silesian Voivodeship, in south-western Poland. It is the seat of the administrative district called Gmina Żórawina. Prior to 1945 it was in Germany.The village has a population of 1,700...

, south of Wrocław. It was established in 1932 as "Reichssender Breslau" and used as an antenna tower. Originally it was a 140 metre tall free-standing lattice tower built of wood, on which a wire antenna was hung up. On the top of the tower there was an octagonal ring of bronze with a diameter of 10.6 metres for electrical lengthening of the antenna.

In 1940 a second transmission aerial was built. It was an arrangement of three T-antenna

T-antenna

A T-antenna is an antenna whereby "a vertical or sloping wire is connected to the approximate centre of a straight horizontal top wire" . This forms its characteristic "T"-shape.-External links:*...

s mounted on three 49.9 metre tall guyed mast

Guyed mast

A guyed mast is a tall thin vertical structure that receives support from guy lines.Guyed masts are frequently used for radio masts. The mast can either support aerials mounted at its top, or the entire structure itself can function as an antenna ; this is called a mast radiator...

s, which formed a triangle with equal side length. This antenna and the wood tower was in use until the shutdown of the facility on February 7, 1945.

After 1945 transmission was resumed by the Polish Broadcasting Company using the wood tower as an antenna tower. The frequency of the transmitter was changed to 1206 kHz in 1965. In 1976 a 260 metre tall mast radiator

Mast radiator

A mast radiator is a radio mast or tower in which the whole structure itself functions as an antenna. This design is commonly used for transmitting antennas operating at low frequencies, in the VLF, LF and MF ranges, in particular those used for AM broadcasting. The metal mast is electrically...

 was built at the site, with the radiated power increased to 200 kilowatts after its completion. The wood tower remained as a backup antenna until its demolition in fall 1990. Until its own demolition, the tower was the tallest wooden structure on Earth after the demolition of the wooden radio tower of Transmitter Ismaning

Transmitter Ismaning

The Transmitter Ismaning was a large radio station inaugurated in 1932. From 1932 to 1934 this transmitter, which replaced the transmitter in Munich-Stadelheim, used a T-antenna as transmitting antenna, which was hung up two 115-meter-high freestanding wood framework towers...

 on March 16th, 1983.

In 1997 the MW transmitter was shut-down. The guys of the mast, which were divided by insulators, were replaced with guys without insulators as the mast is now only used for FM- and TV-transmissions.

TV-Programmes

Program	Frequency	Channel Number	Transmission Power
DVB-T Polskie Radio Polskie Radio Polskie Radio Spółka Akcyjna is Poland's national publicly funded radio broadcasting organization.- History :Polskie Radio was founded on 18 August 1925 and began making regular broadcasts from Warsaw on 18 April 1926....  S.A.	530 MHz	28	5,50 kW
TVP DVB-T Telewizja Polska Telewizja Polska Telewizja Polska Spółka Akcyjna is Poland's public broadcasting corporation... S.A.	530 MHz	28	5,50 kW
TVN TVN S.A.	751,25 MHz	56	10 kW

FM-Radio Programmes

Program	Frequency	Transmission Power
PR1 Polskie Radio S.A.	87,70 MHz	10 kW
Radio Wrocław Polskie Radio - Regionalna Rozgłośnia we Wrocławiu "Radio Wrocław" S.A.	89,80 MHz	6 kW
Katolickie Radio Rodzina Archidiecezja Wrocławska	92 MHz	10 kW
RMF FM Radio Muzyka Fakty Sp. z o.o.	92,90 MHz	10 kW
106,1 Roxy FM Radio Klakson sp. z o.o.	106,10 MHz	10 kW
PR4 Polskie Radio S.A.	107,50 MHz	5 kW

External links

• http://www.emitel.pl/obiekty/wroclawzorawina.html
• http://www.ukf.pl/index.php/topic,52.0.html
• http://www.skyscraperpage.com/diagrams/?b47072
• http://www.skyscraperpage.com/diagrams/?b60101
• http://skps.wroclaw.pl/wieczorynki/wiecz09.php
• http://radiopolska.pl/wykaz/pokaz_lokalizacja.php?pid=138