Aholming transmitter
Encyclopedia
Aholming transmitter is a facility for broadcasting the program of Deutschlandfunk
on 207 kHz with a power of 500 kW at day and 250 kW at night between Aholming
and Ottmaring in Bavaria.
Aholming transmitter, which can be received in most parts of Europe, was built between 1986 and 1988 as replacement of Erching transmitter
. This was necessary as night time operation on 207 kHz requires according to the waveplan of Geneva a directional radiation pattern for whose realization a second mast was required. This mast could not be built on the site of Erching
, as the site had to be cleared from tall structures as in its proximity the new airport of Munich
was under construction.
Aholming transmitter, which went in service on January 1, 1989 uses as antenna a directional antenna consisting of two grounded masts, which are guyed in three levels 101, 203 and 239 metres above ground. Over the guy level, which is fixed with the mast in a height of 203 metres, the transmission power is fed into the mast.
Therefore from the top of the helix building close to the mast three conductor ropes run upward to a point of the 203 metre guy level, which is situated 110 metre away from its anchor point of the mast.
Both masts, which are equipped in 6 levels with flight safety lamps are nearly of the same height to wavelength ratio as those of Sender Donebach
( 0.1829 ). The distance between them is 483 metres.
At daytime the directional pattern of Aholming transmitter shows only a slight maximum toward Northwest and Southeast.
At nighttime, when transmission power has to be reduced to 250 kW, both masts are fed with a phase shift of 117°. By this measure a strong directional radiation pattern occurs with a power reduction to 2.5 kW in azimuth ranges between 72 and 88°, 130 kW in azimuth range between 115 and 160° and 100 kW between 160 and 230°.
The transmitter building odf Aholming transmitter is 420 metres away from both masts. It has an area of 1300 m*m and a volume of 6725 m*m*m. The transmitter consists of 2 250 kW-units, which are mostly identic to the devices used at Sender Donebach. They use dynamic amplitude modulation, which is generated by using pulse-width modulation, a technique also used in modern static inverters.
Deutschlandfunk
Deutschlandfunk is a German public broadcasting radio station, broadcasting national news and current affairs.-History:Broadcasting in the Federal Republic of Germany is reserved under the Basic Law to the states. This means that all public broadcasting is regionalised...
on 207 kHz with a power of 500 kW at day and 250 kW at night between Aholming
Aholming
Aholming is a municipality in the district of Deggendorf, Germany.Near Aholming there is a Deutsche Telekom AG long wave transmitter for transmitting the programs of Deutschlandfunk....
and Ottmaring in Bavaria.
Aholming transmitter, which can be received in most parts of Europe, was built between 1986 and 1988 as replacement of Erching transmitter
Longwave transmitter Erching
The Erching transmitter was a longwave broadcasting facility of the Voice of America, established in 1953 near Erching, Bavaria, Germany. The transmitter used a 256 metre high guyed-steel-framework mast aerial, at the time of its inauguration the most powerful radio station in the world with a...
. This was necessary as night time operation on 207 kHz requires according to the waveplan of Geneva a directional radiation pattern for whose realization a second mast was required. This mast could not be built on the site of Erching
Longwave transmitter Erching
The Erching transmitter was a longwave broadcasting facility of the Voice of America, established in 1953 near Erching, Bavaria, Germany. The transmitter used a 256 metre high guyed-steel-framework mast aerial, at the time of its inauguration the most powerful radio station in the world with a...
, as the site had to be cleared from tall structures as in its proximity the new airport of Munich
Munich International Airport
Munich Airport , is located northeast of Munich, Germany, and is a hub for Lufthansa and Star Alliance partner airlines. It lies nearby the old city of Freising and is named in memory of politician Franz Josef Strauss...
was under construction.
Aholming transmitter, which went in service on January 1, 1989 uses as antenna a directional antenna consisting of two grounded masts, which are guyed in three levels 101, 203 and 239 metres above ground. Over the guy level, which is fixed with the mast in a height of 203 metres, the transmission power is fed into the mast.
Therefore from the top of the helix building close to the mast three conductor ropes run upward to a point of the 203 metre guy level, which is situated 110 metre away from its anchor point of the mast.
Both masts, which are equipped in 6 levels with flight safety lamps are nearly of the same height to wavelength ratio as those of Sender Donebach
Sender Donebach
The Sender Donebach is a 500-kilowatt longwave radio transmitter operating on 153 kHz and transmitting the program of German public broadcaster Deutschlandfunk...
( 0.1829 ). The distance between them is 483 metres.
At daytime the directional pattern of Aholming transmitter shows only a slight maximum toward Northwest and Southeast.
At nighttime, when transmission power has to be reduced to 250 kW, both masts are fed with a phase shift of 117°. By this measure a strong directional radiation pattern occurs with a power reduction to 2.5 kW in azimuth ranges between 72 and 88°, 130 kW in azimuth range between 115 and 160° and 100 kW between 160 and 230°.
The transmitter building odf Aholming transmitter is 420 metres away from both masts. It has an area of 1300 m*m and a volume of 6725 m*m*m. The transmitter consists of 2 250 kW-units, which are mostly identic to the devices used at Sender Donebach. They use dynamic amplitude modulation, which is generated by using pulse-width modulation, a technique also used in modern static inverters.