Ismaning radio transmitter

Construction

Since the first antenna had an unfavorable vertical diagram, one of the two towers was dismantled in 1934 and rebuilt on a 39 m high wooden base. During the works the transmission mode was performed using an L antenna that was stretched between the other tower and a wooden mast. After completion of the new wooden tower, a height of 156 meters had ( with the arms that carried its antenna 163 m ), the second wooden tower was dismantled and rebuilt in 1935 in Nuremberg - Kleinreuth, where he served as a transmission tower for medium wave up to the year 1961. The wooden tower in Ismaning wore a dipole antenna, the feed point was located at 120 m altitude. From this input point more attached to the outside of the tower wires led to the arms on the spire and attachment points at 80 m height. At this height, was located inside the tower there is a differential transformer whose task was to prevent the leakage of radiated high frequency via the feed line.

Broadcasting technology

These developed by Lorenz antenna is referred to as Höhendipol and was one for the transmit frequency used 1934-1950 740 kHz optimized shrinkage reducing the transmitting antenna. However, it was on this antenna, which was used until 1969, be sent due to the predetermined by the Copenhagen wave plan directional beam runs only during the daytime hours. After a new medium wave transmitter mast was erected, 1969 Höhendipolantenne was dismantled the wooden tower. From 1969 to 1977, the wooden tower still served for the accommodation of transmit antennas for FM broadcasting. 1977 took over a 100 m high guyed lattice steel mast also this function so that the wooden tower from 1977 was no longer functional, but was still a Grade II listed now view object. However, the ravages of time gnawing visibly on the construction, which was nicknamed " Bavarian Eiffel Tower ". Since the tower apparently could not be rehabilitated, he was blown up on 16 March 1983. To date, however, are the concrete foundations and the antenna Abstimmhaus, which was under the tower structure is obtained.

For the medium-wave broadcasting now a 171.5 m high, insulated against ground guyed tubular mast is used, which was completed in 1969. It is fed several times to achieve a flat radiation ( shrinkage -reducing transmitting antenna ) and is electrically disconnected to each in 56 and 117 m height by separating insulators.

Due to the requirements of the Geneva wave plan had in transmission mode with 600 kilowatts during the night hours fade out to a northeasterly direction take place, so as not to interfere with the emission and reception of the same frequency channel in Saint Petersburg. For this, a 71 m high, insulated against ground guyed steel lattice mast was erected in 1978 near the pipe mast described. This reflector mast is dispensable with the power reduction of the transmitter to 100 kilowatts in 1994, because at this power also can be sent with omnidirectional radiation without the expected failure of the transmitter in Saint-Petersburg at night. It was dismantled in 1999 and has since then served on the medium wave transmitter court as a transmission tower.

As a reserve antenna erected in 1947 a 105 m high, insulated against ground guyed steel lattice mast in the immediate vicinity of the station building is available. Until 1969 this was the mast, originally served to broadcast the AFN program on medium wave 126 meters tall and wore 1958-1969 transmit antennas for FM. In 2007 the tower was dismantled at about 70 m and the grounded foot. He has since then served as an antenna for radio relay carrier.

Due to the requirements of the Copenhagen plan had to wave this medium wave transmitter of the Bavarian Radio Symphony Orchestra from 1951 to be operated during the night hours with directional radiation (see above). However, the former antenna on the wooden tower could not be used for this purpose, which is why a new directional antenna consisting of two 94 m high, insulated against ground steel framework masts was built on the station area.

This new transmitting antenna was to spread the program of the Bayerischer Rundfunk in this form until 1969 in use. From 1969 to 1994, the setting operation still existing antenna system for the dissemination of the AFN program served on the medium wave frequency 1107 kHz. In contrast to the period before 1969, the transmission mode was driven now with omnidirectional characteristic, by only one mast was actively fed and the other according served as a reserve antenna. The northeastern these two poles was dismantled in late April 2010.

As a short- wave transmitting antennas 1976 errichtener two each 35 m high guyed lattice steel masts dipole and a 1980 three each 55 m high guyed lattice steel masts went into operation Winkeldipolantenne with omni- served. After final adjustment of the short- wave operation on 1 October 2010, the two antenna systems were dismantled.

To broadcast the FM stations served from 1977 to 2010 a silvery gray, about 100 m high guyed lattice steel mast and grounded with dipole fields at its peak in the vicinity of the station building. In 2010, this transmission tower was replaced due to aging with a new transmission tower.

The Voice of America, later the International Broadcasting Bureau ( IBB), for operation up to 1994 near Ismaning extensive transmitters for shortwave, but now all have been completely dismantled. The medium wave transmitting antenna for 1197 kHz was arranged in four square, insulated against ground steel truss masts, built in 1949 and the mid-1990s were overhauled. This system offered the possibility of a directional radiation with switchable directional characteristic.

On March 16, 2007, these four medium wave transmitter masts were dismantled. The end of 2007 then all the other systems ( satellite uplink and downlink ) the site were dismantled and completely abandoned.

2010, a 210 -meter-high radio mast for FM radio was built.

The private radio chain Radio Arabella is 11 kilowatt transmitter power, the frequency with the largest range of all FM radio programs of the transmitter Ismaning. While the programs of the Bayerischer Rundfunk have a higher output power, rich because of the weaker input power ( 10KW ) but no further.

Frequencies and programs

Medium wave 801 kHz

After many years of broadcasting the Bayern 1 program, the frequency 801 kHz in Ismaning served since 8 October 2007 on the dissemination of the program Bavarian Open Radio, which was renamed on May 5, 2008 on3 -radio. Since January 10, 2011, the program Bavaria plus is emitted. ( Transmission power until 1994: 600 kW, 100 kW after EMRP).

Medium wave 1107 kHz

The system operated by the Bavarian Radio Medium wave transmitter beamed to 1994 on the frequency 1107 kHz from the program AFN. Both the transmitter and the southwestern of the two antenna masts are still present, but out of service.

Medium wave 1197 kHz

On the frequency 1197 kHz beamed the Voice of America, later the International Broadcasting Bureau diverse programs: for example, " VoA Europe", and since the Yugoslav wars in the 1990s broadcasts in Serbian and Croatian Radio Free Europe. Since 27 March 2005, the transmitter is switched off. The installation is fully dismantled since the end of 2007.

Shortwave 6085 kHz

Since May 2005, the KW transmitter Ismaning of Bayerischer Rundfunk was operated on 6085 kHz digital. Aired the program was B5 -date. October 1, 2010, this service was discontinued due to austerity measures by the BR. The short- wave transmitter and the short- wave antenna were completely eliminated in the course of 2011.

Analogue radio (FM )

The antenna pattern of the main beam directions are given in degrees in the case of directed radiation.

Digital radio ( DAB)

DAB is broadcast in vertical polarization and single-frequency operation with other transmitters.

  • 1 Bavaria (Munich ) (96 kbps DAB )
  • Radio 2Day (80 kbps DAB )
  • Digital Classix (80 kbps DAB )
  • Radio Gong 96.3 (80 kbps DAB )
  • Radio Gong Mobil ( 80 kbps DAB )
  • Energy Munich (80 kbps DAB )
  • EgoFM (72 kbps DAB )
  • Munich Church Radio / Munich (72 kbps DAB )
  • M94.5 (96 kbps DAB )
  • 95.5 Charivari (80 kbps DAB )
  • LORA München / Radio Feierwerk / CRM (80 kbps DAB )
  • Radio Arabella (80 kbps DAB )
  • Bayern 1 (Upper Bavaria) (160 kbit / s)
  • 1 Bavaria (Franconia) (80 kbit / s DAB )
  • Bayern 1 ( Franconia ) (80 kbit / s DAB )
  • Bayern 1 ( Lower Bavaria / Upper Palatinate ) (80 kbit / s DAB )
  • Bayern 1 ( Swabia) (72 kbit / s DAB )
  • Bayern 2 plus (80 kbit / s DAB )
  • Bayern 2 (80 kbit / s DAB )
  • Bayern 3 (160 kbit / s)
  • BR -Klassik (128 kbit / s DAB , multi-channel sound )
  • B5 aktuell (80 kbit / s DAB )
  • B5 plus (64 kbit / s DAB )
  • BR transport (48 kbit / s mono )
  • Lower Franconia: Kreuzberg (Rhön ), Pfaff mountain ( Aschaffenburg ), Würzburg ( Frankenwarte )
  • Upper Franconia Bamberg ( Geisberg ), ox-head ( Fichtelgebirge)
  • Middle Franconia: constable mountain ( Burgbernheim / Franken height ), Nuremberg ( television tower)
  • Lower Bavaria: Brotjacklriegel ( Deggendorf ), Landshut
  • Schwaben Augsburg (Hotel Tower ), Gruenten ( Sonthofen ), Ulm ( Cow Mountain ) [ Baden-Württemberg ], pledges (Vorarlberg), Hühnerberg (Harburg )
  • Oberbayern: Gelbelsee, Hochberg (Bavaria ), Ismaning, Munich ( Olympic Tower ), Wendelstein ( Bavarian Zell)
  • BR -Klassik (192 kbit / s)
  • Bavaria plus (128 kbit / s)
  • PULS ( BR) (128 kbit / s)
  • Antenne Bayern (80 kbit / s DAB )
  • Rock Antenne (80 kbit / s DAB )
  • Antenna Top40 (72 kbit / s DAB )
  • Antenne Bayern info digitally (40 kbit / s mono DAB )
  • Radio Galaxy (80 kbit / s DAB )
  • Absolutely HOT (72 kbit / s DAB )
  • Lower Franconia:
  • Upper Franconia:
  • Middle Franconia:
  • Upper Palatinate:
  • Lower Bavaria:
  • Swabia:
  • Oberbayern:
Possession (law) Microwave transmission T-aerial Earthing system Geneva Frequency Plan of 1975 Radio Free Europe/Radio Liberty Radiation pattern Olympiaturm Ochsenkopf Transmitter Dorint Hotel Tower List of transmission sites Structurae
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