Foyle's War

'ccomley' writes - Andrew Foyle is shown around one of the Chain Home radar stations, and both then and later during the test flight, we are shown pictures of a radar screen. This is the "traditional" circular screen with a revolving radius lighting up "blips" as it passes them. Only radar screens didn't look like that in 1939. There were no rotating antennae. Chain Home used two separate fixed arrays (we did see the towers in the ep) which can only tell distance, not direction. Direction is calculated by taking readins from bothe the orthoganal arrays. The radar screen from each array looks more like an oscilloscope screen - a horizontal green line with peaks and troughs, the further the peak from the edge of teh screen, the further out the "return".