SU48635A1 - Device for high-speed telegraphy - Google Patents

Description

In radio telegraphing, the transmission of signals to the radio bureau, to the transmitting radio station and from the receiving point to the radio bureau is carried out at. the form of tonal parcels. Signals, i.e. points to the dash, come in, thus, in the form of sinusoidal segments of sound frequency. In order to convert them into DC pulses, which is necessary in one case for operation of the undulator, and in another case for manipulation on the transmitter, the tone package is rectified. The output of the rectifier device in this case inevitably appears resistance, shunted capacity. The constant time has the opposite effect. It is useful for rectification and is harmful when it is turned on and off, because the relaxation time can be one order with the interval between the signals.

The proposed device allows for perfect removal of the container. It is based on a four stroke rectification. The incoming oscillation is guided along two channels, in one of which it rotates 90 ° in phase. In each of the channels, a push-pull rectification is applied, and when operating on the total load, the rectified voltage curve has the form shown in FIG. 1, instead of the one shown in FIG. 2

If you make a 1. large enough value and apply a straightened voltage to lock in the case of receiving-output, and in the case of a transfer-modulated lamp, then the voltage ripple can be completely ignored.

As can be seen from the diagram shown in FIG. 3, the phase rotation function is performed by the L- / lamp. Since it is a shielded lamp, its internal resistance / is high. For example, the lamp SB-112. If the self-induction of the primary winding of the transformer Tj included in its anode circuit is small, then the current through the lamp will coincide in phase with the voltage of the control grid. V,

And the same voltage V. at the anode load,

as well as on the grid of the lamp L-2 will differ in phase from the voltage V

approximately 90 °.

Luba of the chains formed by the system consists of self-induction and resistance. The attenuation factor of any circuit p

-J can be made arbitrarily pain //

shim. In this case, the smallness of the time to establish a stationary regime is a thing that is obvious and easy to implement.

The advantages of the applied method of phase rotation with the help of a lamp consist in a large value of the corresponding circuit composed of the lamp resistance L-1 and the self-induction 1 of the transformer T, in the convenience of obtaining the same voltages Egg and Ed by selecting the transformation ratios of the transformers TI and Ha, and Finally, it is possible to obtain a uniform amplification of the frequency band 200-2400 Hz with an appropriate selection of transformer data Tg (a tonal parcel can be carried out at any of the frequencies of the specified range).

The proposed device may allow high-speed telegraphy at a speed of 50 words per minute.

The subject matter of the invention.

A device for high-speed telegraphy, characterized by the use, in order to carry out a four-phase rectification, of a signal, an additional lamp with a shielded grid, turning the arrival phase of the oscillations through 90.

FIG.

1GSHASH LALLA

T,

2