 The facility was located on an elevated part of Ashdown Forest, about above sea level, at King's Standing near Crowborough, East Sussex.The RCA transmitter used three class B modulators in parallel feeding three parallel 170 kW (nominal) power amplifiers (PAs), one modulator dedicated to a specific PA.The PA units were operated in class C using four GL898 valves in each PA; four were also used in each modulator.