DE1248110B - Circuit arrangement for switching through pilot voltages for additional equalizers in carrier frequency wide-area systems - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY Int. Cl .:

H04b

GERMAN

PATENT OFFICE

EDITORIAL

H04m

German class: 21 a2 - 36/13

Number: 1248 110

File number: T 29662 VIII a / 21 a2

Filing date: October 26, 1965

Opened on: August 24, 1967

The main patent relates to an electronic remote control device for triggering the automatic Adjustment and regulation of the equalizer of additional equalizers for multi-channel carrier frequency wide area systems, in the case of a remote control office, the individual equalizers that lead to different Coaxial lines belong in one cable and are installed in different main offices, at the same time successively caused to automatically adjust, with each from the remote control office individual control signals are sent out and received in each main office and there is a «level Activate the binary reception counter that counts after the corresponding remote control pulses have been received causes the appropriate equalizer to set. · ■ '- -'

The reception counter actuates one setting transistor for each coaxial line. The setting transistors have among other things, the task of a common pilot receiver for all coaxial lines to connect their response to a decoupling of the corresponding KoaxiaUeitung. the Switching the pilot receiver through to the decouplings is expediently done by means of a relay, because in the "not switched through" state there is a large blocking attenuation between the decoupling and the pilot receiver is needed. Thermogas pressure relays are particularly suitable as relays because they are small Have open contact capacity "and are spatially small.

Thermogas pressure relays have relatively long response and release times that depend on the excitation and depend on the ambient temperature. The fall time is usually greater than the response time. If two coaxial lines are to be equalized shortly after one another in an office, it could it can happen that the second relay has already picked up before the first relay has dropped out. Through this there would be very strong crosstalk between the two coaxial lines via the two relays appear. An overlapping of the switching times of two relays in one office is to be avoided. The easiest way to do this is to ensure that the response time of the thermal gas pressure relay is sufficient is extended.

An economical solution to this problem is given according to the invention in that the response delay all of these relays in one office through one in the common emitter lead the setting transistors arranged delay circuit takes place, which is actuated when one of the setting transistors stimulated by the reception counter

Circuit arrangement for switching through
Pilot voltages for additional equalizers in
"Carrier Frequency Wide Area Systems

Addendum to the patent: 1159 033

Applicant:
Telefunken

Patentverwertungsgesellschaft mb H.,
Ulm / Danube, Elisabethenstr. 3

Named as inventor:

DipL-Ing. Joel Korn,
Manfred Schmalzl, Backnang

is, "whereby the delay circuit reduces the heating current of the thermos gas pressure relay from a small Brings the initial value to the final value within a specified time.

A circuit arrangement for self-running relay chains is known (German Auslegeschrift 1090 267) with fast-switching chain relays combined in one or in two groups and corresponding to one or two control lines, e.g. B. for test distributors, numerators or relay selectors, in Telecommunications, in particular telephone systems, in which all chain relays have a common delaying Switching means is assigned, which is optionally switched on to the individual chain relays. The fast-shifting ones Chain relays should be delayed so that slow counting processes are more precise Incremental speed can be recorded.

In the subject matter of the invention, relays that work slowly should be delayed in order to to prevent that a relay has already picked up before the previous relay has dropped out.

In the figure, an embodiment of the invention is shown. The receiving counter EZ controls four setting transistors Tsl to Ts 4 in such a way that within a control cycle in which the receiving counter assumes all of its possible 2 η positions , each setting transistor becomes conductive once and the associated one

- ■ - ■ · ■ '- ■. 709 638/391

Claims (3)

Causes equalizer to adjust. The collector currents of the setting transistors flow through the thermal gas pressure relays TRI to TR 4. The emitter-base path of a transistor TsS is traversed by part of the emitter current of the conducting setting transistor, the transistor TsS is also conducting and stimulates a bistable trigger circuit B, which in turn controls the automatic setting of the additional equalizer actuated. The output A of the flip-flop B has a low potential in the rest position and a high potential in the excited state. The operating voltage is applied between terminals Ub and 0. The delay circuit now consists of the resistor R1, the transistor Ts 6, the i? C element R2C and the diode D. If a control transistor becomes conductive, the transistor Ts 6 is initially blocked and the current through the resistor .R1 is limited. The high potential occurring at output A charges capacitor C via resistor R2. After a predetermined delay time determined by the sizes of the resistor R2 and the capacitor C, the capacitor C is charged to such an extent that the transistor Ts 6 becomes conductive. The emitter-collector path of the transistor Ts 6 short-circuits the resistor R1, and the collector current of the control transistor rises to its final value. The diode D, parallel to the resistor R2, is polarized in such a way that it is blocked when the capacitor C is charged. When the control transistor is blocked and the trigger stage B is in its rest position Mppt, the diode D becomes conductive and discharges the capacitor C visually. Patent claims: 1.Circuit arrangement for switching through pilot voltages for additional equalizers in carrier frequency wide-area systems, with the automatic setting of the additional equalizers belonging to the individual coaxial lines from a remote control office is triggered, whereby each individual control signals from the remote control office sent out and received in every main office and actuate an η-level binary receive counter there, which counts after receiving of the corresponding remote control pulses, one control transistor per additional equalizer conducting makes, according to patent 1159 033, and a thermal gas pressure relay energizes that decouples the corresponding coaxial line switches through to a common pilot receiver with a pull-in delay, characterized in that the response delay of all these relays in one office by one in the common Emitter supply line of the adjusting transistors arranged delay circuit takes place, which is actuated is when one of the setting transistors is excited by the receiving counter, the delay circuit brings the heating current of the thermogas pressure relay from a small initial value to the final value within a specified time. 2. Circuit arrangement according to claim 1, in which the control transistors when responding via an auxiliary transistor excite a bistable multivibrator whose output changes from low to high potential, characterized in that the parallel connection of the emitter-collector path of a delay transistor (Ts 6) and one Resistor (R ₁ ) is arranged in series with the common emitter lead of the control transistors (Tsl to Ts 4) and the base-emitter path of the delay transistor (Ts 6) receives its control voltage via an i? C delay element (R ₂ C) from the output (A) of the bistable flip-flop (B) . 3. Switching arrangement according to claim 1 and 2, characterized in that a diode (D) is connected in parallel to the resistor (R ₂ ) of the RC delay element, which is polarized so that it is blocked when charging the capacitor (C). Considered publications:
German interpretative document No. 1090 267. 1 sheet of drawings 709 638/391 8.67 © Bundesdruckeret Berlin