During Italian ATV switch-off in Puglia (a beautiful southern Italian region), Nexum installed a large DVB-T system based on 5 x 5 kW RF output power transmitters. Final Customer was Rai Way and transmitting site was known as Turrisi. TV transmitters were liquid cooled and manufactured by Plisch while the cavity combiner was supplied by COM-TECH. Heat dissipated by the transmitters was brought to the external mounted heat exchangers via a complex system of redundant stainless steel tubes. Also heat exchangers are redundant (5 + 1). Despite the time schedule was challenging, the system was commissioned on time avoiding any user’s disruption.
Plisch transmitters operated in active reserve configuration. Each transmitter is based over two separate amplifying sections (each one 2,5kW) which are internally combined. In case of fault of one of them, Spinner coaxial switch still put on air the operating one while the defective is switched off. In this way, in case of single fault, Rai Way MUXes remains on air with a RF loss of only 3dB.
At the ground floor, the pumps were installed. They keep moving the cooling liquid. Like all other parts of the transmitting system they are fully redundant.
Another view of the complex network of stainless steel tubes between pumps and heat exchangers.