SU68888A1 - Receiver for phase telegraphy - Google Patents

Description

The subject invention is a receiving device for phase telegraphy.

As in the known devices of this type, in this device the main received oscillation, modulated during the phase, is fed to the phase disc driver together with the auxiliary voltage.

According to the invention, the auxiliary voltage, having a half frequency as compared to the main oscillation frequency, is fed to the phase discriminator through frequency doublers with a phase shift n in this case being converted into short pulses.

The CxeAia of the device proposed and the time diagram explaining its action are shown in FIG. and 2.

Two low-frequency sinusoidal voltages are fed to the receiver (Fig. 1) from the transmitter side. One of them is the main one - it has a frequency and is manipulated in phase in accordance with the transmitted program. The second has a frequency - and is not manipulated in phase.

The first of these oscillations through the transformer 7 and half-wave rectifier with diode 2 and load 3 enters the circuit of the grids of the lamps L- and L.2 of the phase discriminator 4 in the same phase.

The auxiliary voltage after doubling the frequency and converting to pulses with the help of full-wave rectifiers 6 and 7 enters the grid circuit of the lamp L, without a phase change, and into the grid circuit of the lamp Lz with some phase shift, for example, l / 2, introduced by the phase shifter 5. The output voltage of the phase discriminator 4 through the electronic relay 8 is fed to the ondulator 9.

A timing diagram of the processes occurring in the device is shown in FIG. 2. Here, the characteristic of the lamp A is depicted on the left above the abscissa axis and the pulses acting in the grid circuit of this lamp are below. At the same time, the pulses obtained from the main oscillation are depicted with a dotted line and are denoted as indexol Dt, and the pulses obtained from the auxiliary oscillation are shown as solid

and denoted by the index -.

The characteristic of Lalsha L. is shown under the abscissa axis, and the pulses acting in the circuit of its grid are at the top, with the impulses from the main oscillation also indicated by the index Qt, and the impulses from the auxiliary oscillation indicated by the index

(-2- + y), which conditionally notes

It is a fact that the pulses from the auxiliary oscillation enter the grid circuit of the lamp L. with a phase shift of 90 °.

The pulses of the anode currents of the lamps A and 7/2, appearing for short periods of time, are designated by the numbers 7–2 and 3–4, respectively.

As can be seen from FIG. 2a, 2b and 2c in the absence of manipulation of the phase of the main oscillation 93 (0 0, pulses appear in the anode circuits of both lamps

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(Fig. 2a) and the electronic relay, tilting with a higher frequency, does not cause the inductor to trip. If there is a phase shift of the main oscillation (p (t) 0, Figs. 2b and 2c), the pulses at the input of the electronic relay have only one direction and it is set in a particular position depending on the sign of the phase change.

Subject invention

A receiving device for phase telegraphy using a half-frequency unmodulated auxiliary oscillation, which is worn out after doubling with the main oscillation using a phase discriminator, characterized in that the doubling auxiliary oscillation is converted into pulses by supplying it to the duplicators in a grid of discs of the discriminator with the offset in phase.

FIG. one

FIG. 2