Viewing first the video recording of the running signal flow, picked-up at the in- output test pin-connector 9. Firstly considering the pole- like pulses originating from the simulated aircraft system. These pulse being trigger by the instance when the sine-wave signal is passing through 0°. This is the core signal on which the entire Nachtfee system is relying. Essential in the whole system is (was) that the Nachtfee Console on the ground necessitates actual information what the hypothetical 0° status of the aircraft is. As the Nachtfee signal transfer is relying upon signal phases in the domains of time. A simple example: Nachtfee is fully dependable of delayed signals. But the to be guided aircraft is, they hoped for, travelling from the controlling station. Consequently, a signal phase shift is also arriving every instance later at the aircraft system. But it was necessary to delay (or speed-up) some orders. The time-base system inside a Pathfinder aircraft has to be defined. But range is constantly increasing and this phenomenon has to be cooped with. Therefore, the Nachtfee Console on the ground necessitate a reference send by the time-base system inside the aircraft. The Nachtfee system was a kind of "payload" signal on the guiding EGON (=IFF) system. The Nachtfee signal received by the aircraft FuG 25a transponder was taped and conveyed onto the display crt. But it was after reception again being re-transmitted towards the Nachtfee Console. Factually the Nachtfee Consol possessed also a, what I designated "Range offset". This control compensating for ranges between 0 km and 300 km. Making it simple: it can be adjusted such, that offset can be tuned until the Nachtfee Order pointer is exactly indicating the pulse on the CRT similarly with that is facing the mechanical Nachtfee Order pointer. So far so good. Extensive experiment has shown that the Nachtfee aircraft reference signal has to be adjusted some degrees passed the hour (0°) think of ca. 5 minutes passed the hour. The Aircraft reference pulse is operating within the Nachtfee system being non-coherent. Curiously now when tuning the Phase Control knob, only the received Nachtfee time-base reference pulse (signal) is moving along the LB 2 control screen in the Nachtfee control.