AT97521B - Circuit for multiple transmission and multiple reception using radio frequency waves. - Google Patents

Description

  

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   Coupling circuit together with the oscillation circuit lifting between the anodes and the filament in a known manner as a vibration generator. The grids 7 and the anodes 6 are connected by a resistor 1. a, to which a capacitance 16 is connected in parallel and which acts as a leakage resistor, with a coil 17 in series with the resistor, which forms the secondary coil of a transformer. The transformer has z. B. three primary coils 18, 19, 20, each of which is located in a character generator circuit with an alternating current source of audio frequency 24 or 25 or 26 and key 21 or 20 or 23. The number of primary turns of the transformer is to be selected depending on the number of signaling circuits.

   If the generator 26 gives a current of audio frequency 300 and the generator 25 of 420 and generator 24 of 570, when the button 23 is closed, the amplitude of the energy emitted by the antenna 1 is varied 300 times a second, preferably by a harmonic or Sine waveform follows. Similarly, key 22 varies the amplitude 420 times per second and key 21 varies the amplitude 570 times per second.

   If two or all three of these keys are closed at the same time, the amplitude curve of the energy emitted by antenna 1 becomes a composite of the two or three sine wave curves of the two or three frequencies involved and that which just happens to exist between the generators 24, 25, 26 Phase designation is formed.



   In Fig. 2, the part of the circuit serving to generate vibrations is the same as in Eig. 1,
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 encoder circuit a special transformer is provided. In Fig. 2 2 signal generator circuits are arranged, but the transformers 3J'bzw. 32 are attached to the visual vibration generator. Further
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