Transmitter Dobl

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Transmitter Dobl
Image of the object
Transmission system Dobl with transmission tower
Basic data
Place: Dobl
State: Styria
Country: Austria
Altitude : 349  m above sea level A.
Coordinates: 46 ° 57 ′ 0 ″  N , 15 ° 22 ′ 48.1 ″  E
Use: Telecommunication system
Owner : Dobl-Zwaring municipality
Mast data
Construction time : 1939-1941
Operating time: 1942-1984
Total height : 156  m
Total mass : 47  t
Enclosed space : 7800  m³
Data on the transmission system
Send type: Amateur radio service
Position map
Transmitter Dobl (Styria)
Transmitter Dobl
Transmitter Dobl
Localization of Styria in Austria

The dobl transmitter was a medium wave - transmitting plant in Dobl , 14 km southwest of Graz , which was built from 1939 to 1941 and 1941 in annexed Austria went into operation. The system was planned by Walther Schmidt in his role as Ministerialrat of the Reich Ministry of Post .

history

From 1930, so-called large transmitters with outputs of over 60 kW were built in Germany. From 1938 onwards, the Nazis' propaganda departments equipped the radio stations for the "propaganda war"; Rapid frequency changes from large broadcasters should be possible at any time. The Deutsche Reichspost was supposed to retrofit the existing transmitters, but could not implement this requirement with the existing systems. Therefore, new 100 kW transmitters u. a. in Wroclaw, Hamburg, Heilsberg (Poland, then East Prussia), Mühlacker, Ismaning, Dobrochov near Brno (Czech Republic) and Dobl near Graz. Dobl was one of the German European broadcasters with the name ALPS .

The Dobl transmitter began broadcasting on February 22, 1941 on 886 kHz with 100 kW. Dobl shone in the southeastern European area. After the opening, 24 people were employed in the facility.

He used a 156-meter-high, braced steel truss mast , which is insulated from the ground and braced at heights of 63 and 113 meters, as the antenna carrier and transmission tower . The mast has a weight of 47 tons and stands on an area of ​​about 50 m². As one of the new "rebuilding transmitters", the transmitters for different frequencies were each equipped with special control crystals. They could be tuned to any frequency between 500 and 1500 kHz (medium wave band) in 10 to 20 minutes.

Despite attacks from low-flying aircraft, the longest downtime was two hours.

At the end of the war the transmitter should be blown up. The destruction was prevented by the employees who kept the station occupied until the arrival of the Red Army .

After the war, the station became part of the Alpenland station group set up by the British . For the time being, only the BBC's program was broadcast in the direction of Yugoslavia . From the end of August 1948, the BBC first broadcast 2.5 hours, then by the end of the year 8 hours a day in Czech, Hungarian, Serbo-Croatian, Slovenian, Romanian and Italian via Dobl. From March 1950 onwards, following regulation by the Copenhagen Wave Plan , the station changed its transmission frequency to 1025 kHz and from August 1950 also broadcast a second program.

The Austrian authorities were of the opinion that the strong station in Dobl should be better used with Austrian programs because there were no strong stations for Styria. They asked the British to release the station. On January 22, 1954, the "Sendergruppe Alpenland" was handed over to the Austrian Broadcasting Corporation (ORF), which had been founded the year before. The program Austria 2 was broadcast until 1967 , later Ö1 and Ö Mix .

In 1966 and 1967 the old Lorenz single-wave system in the transmitter was exchanged for one from Telefunken . 1976 to 1977 the transmitter mast was again thoroughly renovated and the earth network relocated; In 1977 the capacity ring at the top of the mast was removed.

Broadcasting was discontinued on March 1, 1984. The entire broadcasting system was sold by ORF in 1988 to what was then the municipality of Dobl. The technical-historical report states, among other things:

"It is the last remaining transmitter system in Europe from around 1940 ..."

- Peter Donhauser ( Technical Museum Vienna )

From 1995 to 2015, the studios of the private broadcaster Antenne Steiermark were located in the transmitter building .

Current use

Today the transmitter is preserved as a technical monument.

The mast and mast house are used for amateur radio service . The following services are available for radio amateurs in Dobl:

Dobl also houses the ADL619 (Graz-Umgebung) club radio station with the callsign OE6XAD; the same place every year along with ADL601 (Graz) a field day . The field day has been organized by the ÖVSV Landesverband Steiermark since 2017 .

literature

  • Peter Donhauser: 100 kW medium wave - radio history using the example of the Styrian broadcaster Dobl . In: Blätter für Technikgeschichte Volume 64, p. 47, Vienna 2002.

Web links

Commons : Sender Dobl  - collection of images, videos and audio files

Individual evidence

  1. ↑ a b c transmitter Dobl near Graz. Retrieved July 22, 2019 .
  2. ↑ FunkIndex Sender Dobl. (No longer available online.) Archived from the original on September 2, 2012 ; Retrieved January 8, 2012 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.sender-dobl.at