SU50462A1 - Device for measuring transmission speed - Google Patents

Description

The proposed device is intended to measure the speed of the radio transmission and reception, if such is done automatically, i.e., if the transmission is made from the trapsmitter and the reception is written to the transmitter.

Until now, the speed of work was set subjectively by eye or determined by measuring the speed of the perforated tape passed through the transmitter.

The proposed device makes it possible to measure the transmission or reception rate without applying any additional calculations directly on the scale of a DC electrical device, graded in international words per minute.

The readings of this measuring device are obtained proportional to the frequency of the following rectangular pulses supplied through the trans1: formatter to the input of the device.

To accomplish this, according to the invention, a measuring device is connected through detectors into a secondary circuit of a transformer, the primary circuit of which is connected via a cathode limiter and rectifier to an input transformer.

The invention is illustrated in the drawing, which shows the electrical circuit of the proposed device.

The rectangular-shaped direct current pulses are sent to the primary of the input transformer /. The alternating electromotive force induced in the secondary winding is rectified by the kenotron 2. The rectified current passes through resistance 3, the grid-thread of the three-electrode lamp 4, parallel to the gap. The connection is made so that this current creates a negative potential on the grid 4. Such work the circuit makes the device insensitive to changes in the amplitude of the voltage on the input, since lamp 4 acts as a limiter, and the current c / ia in the anode circuit of this lamp varies from zero to current corresponding to of zero potential on the grid.

what happens when there is no signal at the input. The voltage fluctuations on the grid of the lamp 4 create current oscillations in the anode circuit of this lamp. By means of a transformer 5 included in the anode circuit of the lamp 4, a non-temporal component is extracted from this current, which is then rectified by a copper oxide rectifier 6 assembled according to a bridge circuit. The rectified current acts on the switch device 7 DC, calibrated accordingly. The magnitude of the rectified current in the secondary winding of the anode transformer will be the greater, the greater the frequency of the current in the primary, i.e., the higher the transmission or reception rate.

The proposed device was tested in a test test cell and showed a number of very valuable properties, in particular, in addition to the above possibility of obtaining a direct reading of the speed of work, the absence of a mechanical connection with any receiving or transmitting equipment and the possibility of its adventing to the measured line by means of a plug connection This adventure is not at all reflected in the work of the receiving or transmitting equipment.

The subject of invention.

A device for measuring the speed of transmission and reception, characterized in that, in order to obtain on a direct current device readings proportional to the frequency of the following rectangular pulses supplied through a transformer to the input of the device, the measuring instrument is connected through detectors to the secondary circuit of the transformer, the primary circuit which is connected via a cathode limiter and a rectifier to an input transformer.