SU24906A1 - Device for inter-selective communication on three wire lines - Google Patents

Description

The present invention relates to a device for mutually selective communication over a three-wire line, in which earth can be one of the wires and which is powered from one central point. The invention aims to simplify the electrical circuit of the device and ensure the reliability of its operation.

The drawing shows a diagram of a device consisting of a central point of the CPU installed at any place on the line and a number of stations, for example, two / Zj and.. The central point is equipped, like other stations, with a microtelephone device and a selector (only the key ). The line to which all subscribers and the central point are connected is two-wire, with one of the three wires L, L, L being one of the three wires on the drawing. At the central point there are linear and calling units, ee LB and WB, a rheostat P and a radar relay head with contact springs.

All these parts can be enclosed, in a small box with removed terminals for batteries and a line ... At the station / 7i there is a key / C, connected between the lines ./ and L, and the selector of the DM is adventitious to the line L and the others. } through the capacitor C

to line l. One of the middle clips of the selector is connected through the additional resistance of the DS to the line L. In addition, at each station there is also a microphone device shown in the drawing only at the station Shch.

Mutual selective communication according to the proposed scheme is carried out as follows. When the key K is closed, for example, at the station I, a circuit is created: -p of the VB battery, relay, K contact, rheostat P, -B battery. The relay, triggered, through its contact (top), connects 4 batteries LB to line L. Capacitor C is charged, and the selector is triggered one step of its dial. When the key is opened, the capacitor -C is discharged through the line L, the relay contact (bottom), the jet coil DR, the line. and the winding voter. The latter, having received a second impulse, but of a different direction than the first impulse, is triggered one more step. The described process is repeated with each subsequent closure and opening of the key.

The potential difference between the wires L and L is established using a rheostat at the central point so that it is approximately 6 volts at Shch. The same voltage on the middle terminals of the selector on each

the negotiation station is established by the additional resistance of the DS.

When using dispatcher telephones, their battery terminals are brought to the middle terminals of the voter. Thus, both the bells and the microphone circuits are powered from the central point. One of the ways of the device’s adventure to the line is shown in the drawing for the Yaz station, where, as mentioned above, there is a microphone M. with an I and P microtelephone transformer, a switch lever and a telephone T connected to wires L. Therefore, between them on the central point of the CPU is included a reactive coil DR, the purpose of which is to filter the currents of the conversational frequency. The range of inter-selective communication according to the proposed scheme is of the order of 50-70 nm. Of course, depending on the state of the line, this distance varies. For communication over an even shorter distance, especially for installations in enclosed areas (elevators, refrigerators, warehouses, warehouses, etc.), as well as for communication between mines, individual buildings in state farms at construction sites, etc. may be more simplified. For example, a telephone can be connected in parallel with a winding of voters.

and the capacitor in the telephone circuit 1 is missing. This scheme can also be used as a dispatcher. To do this, it is only necessary to deprive all the linear subscribers of the keys and leave one at the control. The use of such an installation is possible at large power plants. The positive qualities of the proposed device include the fact that the line is under voltage only during a call, the condenser, the accumulator is also charged only during the call and the discharge of this capacitor is used to drive the inventor instead of sending a current pulse from the battery.

The subject matter of the invention.

1. A device for inter-selective communication over a three-wire line, with one of the wires being full power from one central point, characterized in that when a key K is closed from any station, all the selectors that are not normally under voltage , they work, thanks to their adventure to the line battery installed at the central point of the call relay, and when the key is opened, they work because of the discharge of capacitors C connected in series with the windings of the selectors.