SU36479A1 - The method of synchronization of phototelegraphic apparatus - Google Patents

Description

As is well known, in phototelegraphy there are two ways to synchronize autonomous and forced.

The first method is pezavapsym from noise, but it is complicated because it requires constant adjustment of the number of oscillations of the tuning fork for another device that maintains the frequency stability of the generator feeding the windings of the synchronous machine.

The second method does not have this drawback, but the interference can disrupt synchronism. The proposed synchronization system tends to use the advantages of both of these systems. The proposed system consists of two autonomous synchronous installations at both ends of the corresponding stations. In addition, one of the stations constantly sends synchronous signals perceived by the other, performing forced synchronous jolts in one of the well-known ways, affecting an autonomous local installation. In this way, maintaining the synchronism of the autonomous devices of both stations is achieved without any periodic adjustment of them, but at the same time the possibility of complete synchronism of the systems is eliminated in the case when the interference is stopped for the time being forced sync pulses (340)

down FIG. 1 and 2 depict two possible embodiments of the proposed synchronization system.

FIG. 1, numeral 1 denotes a receiver receiving image signals and synchronism signals.

Filters 2 and 3 separate the timing signals from the signals and the image. The image signals are subsequently transmitted, as usual, to the amplifier and further to the image receiver. Synchronization signals are fed to the grid of the thyratron 4, which is in self-excitation mode. The frequency of the thyratron oscillations is determined by the capacitance 5 and the resistance of the kenotron 6. The pulses arriving at the grid of the thyratron 4 carry the natural frequency of its oscillations, maintaining them in synchronization with the oscillation frequency of the transmitter tuning fork. The coupling from the capacitor 5 is applied to the amplifying lamia 8 and then to the bark of the electromagnet 10 (polarized) located between the tuning fork 14 of the receiver.

On both sides of the tuning fork are coils 12 and 13 of the 1st cascade of a fork-type generator of the usual type. The electromagnet 10 is designed to synchronize the natural frequency of the tuning fork oscillations with the incoming pulses.

with POM01ZTI electromagnetic visdeystvi. A similar scheme can be applied in the case when, instead of a generator giving relaxation oscillations, a low-frequency generator is used (tuned to the frequency of transmitted synchronous shuls), carried along by incoming synchronous pulses. FIG. 2 gives an example of the effect of synchronous pulses directly on a local tuning fork generator.

The subject matter of the invention.

From the synchronization of phototelegraph apparatus, according to the principle of supplying line-by-line synchronous signals, a local generator enthralls at the reception, characterized in that the currents of the pulling generator are fed to a tuning fork generator that feeds from a synchronous motor of the receiver.