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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.