The NARS used "AN/FRC-39(V)" and "AN/FRC-56(V)" transmitting and receiving equipment, manufactured by "Radio Engineering Laboratories", which could be configured for 1 kW, 10 kW or 50 kW power output depending on the range and/or quality of signal required. NARS sites were configured for 10 kW output, with the exception of site 41 in both directions and site 42's connection to site 41. Each set consisted of 2 transmitters and 4 receivers, for redundancy and to boost signal to noise ratios, using vacuum tube technology which proved time consuming to maintain at high levels of efficiency. Levels of service proved extremely variable with the effects of weather and finicky equipment frequently causing loss of connection. Improvements were gained through better maintenance procedures but did not change significantly until the introduction of solid state technology, with the system able to transmit at 9.6kbit/s, (a very fast internet connection for that time), by the time the system was closed down in 1992 after 30 years of service. With the advent of satellite communications (SATCOM) the days of the Troposcatter networks were over, but NARS was closed down early due to the loss of the DYE-2 DEW Line station in 1988, severing the networks connection with the rest of the DEW line. Site 46 also had to close to make way for the new BMEWS Phased Array Radar at RAF Fylingdales. From 1960 the troposcatter sites were built as: