DEP0037237DA - Call searcher for telecommunication systems, especially telephone systems, in which the calling line is marked by a potential that differs from the other lines - Google Patents

Description

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The switching path formed by the electrodes 23 , 24 is then opened. 7 / If the cathode ray bundle is directed onto the auxiliary cathode 23 by means of the deflection plates 25j 26, secondary electrons for the anode 24 become clusters. As a result, the voltage of the auxiliary cathode 23 ″ rises to a value which is somewhat smaller than that of the anode 24 ″. The circuit is then closed. The relay 22 also has one as an auxiliary cathode

effective collecting electrode 31 and a trode 32 acting as an anode. The potential of the collecting electrode 32 becomes the potential the auxiliary cathode 23 is removed and the latter potential will therefore increase when the switching path of the relay. 21 closed is. The auxiliary cathode 31 is via the potentiometer 33? 34 is fed, and is when the cathode ray bundle is incident and When the switching path of the relay 21 is closed, a potential is obtained which is again almost equal to the potential of the anode 32.

As a result of the closure of the two switching paths, the voltage on the auxiliary cathode 31 changes by, for example, half the battery voltage up to almost the full battery voltage.

In the present circuit, the deflection plate 26 of the relay 21 is at a fixed voltage, while the voltage of the Plate '25 of the auxiliary cathode 31 of the relay 22 is removed. The fixed preload is chosen so that when the switchgear is open of the relay 22, the bundle of the relay 21 does not fall on the auxiliary cathode 23, which means that the circuit path of 22 is closed w ^ t is the case when a higher voltage occurs at the auxiliary acthode 31.

The deflection plate 35 of the relay 22 is also at a fixed voltage, while the deflection plate 36 with the end 12 of the Resistor 11 is connected. The fixed voltage is chosen such that the bundle hits the auxiliary cathode 51, JaUf, see above

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This also reduces the voltage of the deflector plate 25 of the relay 21, so that this relay also drops out and control voltage is no longer transmitted, so that the bundle of tubes 13 cannot be changed occupies a stable position. The voltage on the baffle 15 remains constant and consequently the bundle of the tube 1 is also invariable directed at the collecting electrode 7.

Now, in the output circuit of each collecting electrode of tube 1, the excitation circuit of a preferably electronically operating relay is contained. In the output circuit of electrode 7 there is ■ the excitation circuit 41 of a relay with a contact, .42 *,, *

As a result of the ^; fä £ mx [els on the collecting electrode 7, the relay is energized, and the receiving electrode is connected via the contact 42 to earth. The current of the bundle then moves back to the collecting electrode 10, so that the voltage at point 12 drops and the cathode ray bundle of the relay 22 is incident on the auxiliary cathode 31 again. However, since only one voltage occurs at the anode 32 of this relay, which is caused by the potentiometer ratio 28, 29, no voltage increase in the auxiliary cathode 31 and thus in the deflection plate 25 will occur. The cathode ray beam of the tube of the relay 21 therefore does not fall on the auxiliary cathode 23 and no control pulses are transmitted. The bundle of the test switch 1 is therefore invariably directed at the electrode 7.

The circuit, on the other hand, is ready for use to search for another free line and we do this by turning over the changeover contact 37 put into effect "

It can also be noted that the switch 1, after the last contact 9 has been scanned, in various ways by means of of the cathode ray tube system 13 can be returned to its initial position.

It is also possible to return the bundle of the test switch 1 to the initial position after the electrode 7 has been filled, which is e.g. can be done by temporarily suppressing the bundle of the cathode ray tube 13, so that this bundle and therefore also the bundle of the Switch 1 returns to the rest position.

Claims (1)

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