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This time our attention is focussing on the simulated aircraft display (using by the way a genuine wartime crt which equally had been used in the Nachtfee systems. The main aim today is to show you that the Nachtfee order signal painted at the simulated aircraft system is not being hampered by the second signal differing only a single or two Hz; whether above or below 500 Hz does not matter. Explaining that EGON and IFF do not differ much and that EGON is also a secondary radar system; which guides the German Pathfinder aircraft towards a fixed target. Nachtfee aircraft were only Pathfinder aircraft, like were British OBOE Pathfinder such as Mosquitos.