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Today we have reached a stage of affairs, where we may consider that we have reached nearly all our goals. The DMG5K is operating as it should once have been. Albeit, that we only consider: sending an audio signal tone which is being received. Bridging a distance of, say, a single meter as the transmitting energy being absorbed in a dummy-load. Two modules (Roman III and IV) are useless, as the...

Continuing our demonstration in which the receiver module is responding at audio-tone modulation of the transmitter. Fist the audio-generator being set at 1000 Hz, then the pitch being increased to 2000Hz showing, by the way, a higher audio response.

Today the 24th of May 2024 we are receiving (bridging less than 1 m) our transmitter signal. .. We achieved to day that the receiver is operating in such a way, that it compensates the temperature related frequency drift.

Hans is detuning his HP signal generator and we can see the various responses of the motor-controlled frequency tuning.

We are now viewing the section which we consider much cause our nuisance! The two valves on the left-hand side constitute the two discriminator diodes. Hans told me this morning, that when we approached this circuitry he saw an open wire and connected it to what he thought the wire had been broken-off. Then we found that the the interconnected cathodes possessed a dc level of about 60 V, wherea...

Today we would like to approach our deadlock again. The motor tuning is responding, but controlling the receiver tuning by means of the discriminator does not operate. Manually we can force the tuning motor to rotate in either direction, but by no means is showing a capturing response.

Again we start with no mains (220 V) being supplied (using a variac transformer) which is adjusted at about 220 V ac supply. (Please be aware that I notice "within the red circle 'b' whereas it should be, within circle 'a', instead! The 'thermo-relay' delays about 8 à 10 seconds. The two meters being not operated at similar sensitivities. The left one being operated via the 1:10 voltage divider...

Please notice first the relay and its according contacts in front. The finger-pair, being activated by the relay designated '18'. Please notice the left-hand side taller switching-fingers. The most left-hand side one is wire-wound by some resistance wire; which is heating up the bi-metallic left-hand side finger. In front you see the two sets of switching relay contacts. The bi-metallic fingers...

Gezeigt wird heute (9. Februar 2024) Unser Ziel ist zu zeigen, dass das Egon Signal (Sekundär-Radar) und dass das Nachtfee-Kommando Signal sich gegenseitig nicht stören, und ein Kommando Signal wie auch immer korrekt sichtbar bleibt auch noch bei PRF Frequenzunterschiede von nur ein Hz.

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. Ex...

Gezeigt wird erst wie man korrekt der Entfernung Nachtfee Bodensystem zum Flugzeug hin Rechnung tragen kann; einen Vorgang die dauernd nachgeregelt werden muss, da das Nachtfee-Flugzeug sich mit bis zu 500 à 600 km pro Stunde van der Nachtfee/Egon Bodenstelle entfernt.

Today explaining the demonstration of last week in which we used a photographic series. The reason is, the valid finding of the correct alignment adjustment at the dual beam crt type HRP 2 /100/1,5A. It was found that always doubtful alignment were commenced in the adjustment op the aircraft-time-base-reference-pulse at the Nachtfee control screen. Explained are: the three main controlled, actu...

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...

Viewing now in particular what is currently being visible at the LB 2 crt screen of our simulated Nachtfee aircraft display. Up is shown our Signal synthesiser set at 500 Hz constituting our aircraft time-base reference signal; which output is a sine wave with 5 V pp. Viewing the simulated aircraft 'circular deflected' crt screen. The circularly rotating signal originate from our simulated EGON...

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