Funk Blindlande-Anlage


FuBl 2 + EBl 3F



Including two YouTube films


Status: 8 October 2018


We have reached the moment where our reconstructed and simulated  Blind-landing system can be demonstrated.

This project had been accomplished by Hans Goulooze, who really did a tremendous job!



Hans built a beautiful setup (on top, the broad wooden frame), where EBl 2 and EBl 3F have been combined within a common wooden frame, fitting well into our current set up


The shown genuine "Funkertisch" once originated from  a "Siebel 204"; a small passenger aircraft. Is there any Siebel 204 aircraft left in a museum somewhere in the world?

Please notice first the Morse-key and the just on the left-hand side the rectangular box (just visible) with black knob; this is the electrical remote-control with which the EBl 3F being pre-set by means of channel numbers: between 30,00 MHz and 33,3 MHz . (30.5 MHz being channel-number 7)

In front we notice the combined magnetic slave compass and at its outer circle the repeater-pointer to the HF/DF receiver equipment (original designation: "Funkpeiltochter", in German "military days" the HF/DF was designated: APZ 6 (EZ 6 with attached HF/DF antenna); just visible up on the far left-hand side. (albeit, the antenna is just not visible).

However, viewing at the "Funkertisch" far on the left-hand side, we notice one circular control-switch and one is lacking. This indicates: that the Si 204 once had been equipped with the odd "Patin V 25" relays controlled; whereas we are relying on the APZ 6 configuration (electronically controlled).



A brief search on the web, I have come across an unexpected wide range of nice Si 204 photos, some of which shown futuristic cockpit lay-outs.

Maybe not all browsers will follow (supporting) this link, but on our HP-Windows 7 PC it actually opened the photo-gallery.

I have to apologise for this clumsy hyperlink, but it is worth having at least access to otherwise copyright protected images.

According Wikipedia: of the Si 204 once have been built 1216 airplanes, including the Siebel prototype versions V1, V2 and V3.

In 1943, a French company started producing it, but in post-war days it was also produced in Czechoslovakia.

What I know for certain: also the Swiss have flown it long after the war, and our genuine "Funkertisch" originated once from a Si 204 flown by the Dutch "Luchtvaartlaboratorium", in the later 1940s and maybe 1950s as well. 



Viewing the "Funkertisch" just a bit more in details 

The Morse key is truly keying the PT 10 Prüftafel.



Viewing the PSUO-B test set, with attached facility as to simulate both the marker landing beacons as well as the Left-Right virtual approaching beacon; which once could be received at, say, at least 50 km before the true landing strip


YouTube films

Please notice: when viewing, select the full screen option as to view its full content.


Film  0010:     Viewing first the marking-beacon indication at 38 MHz at the 700 Hz tone indicating that the aircraft is actually 3 km in front of the landing strip. Then switching over to 1700 Hz indicating that 300 m has left. The existence of the neon-indicator is causing a sort of tone-distortion, when it ignites.    Our test set is not allowing operating both - the marker-beacon and approaching beam signal - at once.  The next test is the approaching beacon reception. Our test-set has been supplemented with an attached provision generating: the 1/8 (= Left) and 7/8 seconds lasting (= Right) signals, just in the centre there exists an equilibrium and 1/8 s and the 7/8 s signal (8/8 = 1 s) are equally strong and fitting into one another (the German called it "A/ N Verfahren", as Morse code A and N are complementary); creating a single tone signal of 1150 Hz. The pilot will not hear the clicks, because these being generated by the L - R signal switching relays within our attached test box. The pilot could, without looking at the instrument, controlling his correct landing path; because he should hear a single, uninterrupted, tone of 1150 Hz in his earphones.

Film  0011: Viewing first like the previous film. Explaining the two meter pointers. The "Funkertisch" or combined W/T - Navigator table. Genuinely once part of a wartime Si 204 airplane; it wasn't a direct military aircraft, but mainly meant for up to 8 passengers or as a transport plane. Our system, like once, being driven from a the rotary generator U 8; which acoustically might interfere with the landing tones approaching to us via a loudspeaker. 


By Arthur O. Bauer