Museum collection of analogue transmission technology on Nanos
One of the features of high-frequency electromagnetic waves used by UHF and TV transmitters is that they diffract on natural obstacles. As Slovenia is mostly mountainous, transmitters must be placed at the highest possible points. This is the difference from medium-wave transmitters, which until the introduction of UHF transmitters were installed exclusively on flat surfaces, in valleys and by the sea. Five basic transmitter centres were set up in Slovenia, specifically at Krvavec, Kum, Pohorje, Plešivec and Nanos. All these centres were built in the early 1960s and, with the help of a converter network, almost 100% of the populated areas were covered with their signal.
Panorama First UHF audibility measurements in the area where the Nanos transmission centre stands today were made in 1953-1954. Since a large part of the Primorska and Notranjska regions can be covered from Nanos, Slovenian radio UHF programmes started to be broadcast in 1955, and Italian television programmes i