AT103055B - Device for the interference-free reception of wireless signals or for high-frequency telephony on lines using electron tubes. - Google Patents

Description

  

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    Device for the interference-free reception of wireless signals or for high-frequency telephony on lines using electron tubes.
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 of the receiving circuit is: reduced through the tube R1 via the coupling coil 81 in the sense described. The same is effected for the secondary circuit consisting of the coil s and the capacitor c through the tube liCe, the anode circuit of which is coupled to S3 via the coil 84. Instead of reducing the damping, the tube R2 can also serve to generate auxiliary oscillations.



   The mode of operation can be distributed to the two tubes R1 and R2, for example as follows.



   With primary reception only the generator Ri is switched on, both with auxiliary oscillations
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 is, both sounding and undamped stations can be received secondarily, or the damping of the secondary circle is reduced by means of the tube Ra and beats by means of a
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 Receive circles apply.



   In Fig. 2, an example embodiment is shown, by which also undamped
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 or a zikker with a cell in series makes the undamped vibrations audible. In Fig. 2 the detector is denoted by d, the tikker by i.



   In the described and illustrated circuit for damping reduction in all oscillation circuits, it is no longer necessary to provide the coils for different wave stages with branches as before, rather the self-induction of the coil can be achieved by pushing a copper cylinder over the iron core of the coil or over the entire coil can be changed sufficiently within wide limits, so that the use of a previously customary rotary capacitor is no longer necessary. The resulting increase in damping is in any case canceled out by the reduction in damping. According to the above invention, built receiving apparatus with iron coils can consequently be carried out in previously unattainable small dimensions.
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