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Although the research facilities need to have powerful transmitters, the power flux in the ionosphere for the most powerful facility (HAARP) is below 0.03 W/m 2. [2] This gives an energy density in the ionosphere that is less than 1/100 of the thermal energy density of the ionospheric plasma itself. [ 1 ]
The Roumoules transmitter is the main broadcasting facility for longwave and mediumwave broadcasting of Radio Monte Carlo near Roumoules, France [1] and is owned by Monaco Media Diffusion. The 1000 and 2000kW transmitters installed are among the most powerful in the world and can be received well at nighttime throughout Europe.
Much of the site is devoted to the enormous overhead wire antenna array that is necessary to efficiently radiate the VLF waves. The antenna, shown above, consists of ten catenary cables, 5,640–8,700 ft (1,719–2,652 m, 1.1–1.6 miles) long, suspended in a zigzag pattern over the valley between Wheeler mountain and Blue mountain on twelve 200 ft. towers on the mountains' crests.
Installation of second longwave transmitter 1954 - - - - Built of second antenna tower (height: 250 metres) 1955 - 0 - - Mediumwave transmission moved to Marnach transmitter: 1959 - - - 12 kW First FM-transmitter went in service on 92.5 MHz 1959 - - - - Built of third 250-metre tower 1960 750 kW - - - Inauguration of third longwave transmitter ...
Such receivers can decode FM television when an outdoor antenna is connected to the LNB input. Due to the low cost and ease of repurposing old analog satellite receivers, this is the most popular band for FM amateur TV. Commonly used 23 cm FM channels: 1.255 GHz; 1.265 GHz
A mast radiator or mast antenna is a radio tower or mast in which the whole structure is an antenna. Mast antennas are the transmitting antennas typical for long or medium wave broadcasting. Structurally, the only difference is that some mast radiators require the mast base to be insulated from the ground.