Chapters: Orlunda Radio Transmitter, Turning Torso, Grimeton Vlf Transmitter, Solvesborg Medium Wave Transmitter, Kaknastornet, Skanskaskrapan, Nackasandaren, Kista Science Tower, Horby Transmitter, Motala Longwave Transmitter, Brudaremossen Masts,MoreChapters: Orlunda Radio Transmitter, Turning Torso, Grimeton Vlf Transmitter, Solvesborg Medium Wave Transmitter, Kaknastornet, Skanskaskrapan, Nackasandaren, Kista Science Tower, Horby Transmitter, Motala Longwave Transmitter, Brudaremossen Masts, Blabarskullen Transmitter, Garda Business Center, Lisebergstornet, Vannas Tv Tower.
Source: Wikipedia. Pages: 44. Not illustrated. Free updates online. Purchase includes a free trial membership in the publishers book club where you can select from more than a million books without charge. Excerpt: Already in the 1940s The Swedish Telecom Administration Board began to plan to replace to old longwave transmitter in central Motala from 1927 on 30 kW, extended 1935 to 150 kW.
Problems with the old station included the need for being staffed day and night, bad efficiency (only approx 22%), and the occurrence of fading at a distance of only 80 km from the station. The Telecom Board investigated if it was possible to use the already existing area, but the result showed it was not possible. After several measures a site 15 km south-east of Motala and some 5 km east of Vadstena was decided to host the new longwave station. The demands on the new station was several: no staff was needed to supervise the station day and night, two transmitters for single or parallel use, much higher efficiency and an antenna system that must keep the signal as clean as possible in the ground wave without disturbing fading.
The technical department of Televerket, the Swedish Telecom Administration Board, calculated on several different type of antennas - everything from one single stayed mast to a ring antenna system with two rings and one central mast. The final antenna system was developed by the engineer Mr. Folke Stranden and consisted of a ring antenna system with a central mast in the middle and five antennas in a circle with an inbound distance of 630m. In 1958 the ground works for the station began...More: http: //booksllc.net/?id=1290716