SU1437A1 - Method of modulating or manipulating high frequency currents in a network - Google Patents

Description

When transmitting signals, in the case of wiring with continuous waves i, as is well known, it is necessary to periodically short circuit the short and open the self-induction coil I connected to the antenna.j

To extinguish the voltaic arc that appears at the moment of rupture, magnetic blast or compressed air is usually used.

Voltage arc at rupture can be avoided by applying the diagram shown; in FIG. 1-3.

In this diagram means: 1-generator of undamped oscillations; 2-primary transformer winding, which is an extension coil of self-induction; .7 - secondary winding of the transformer; 4-4 - self-induction coils; o - capacitor and 6-contactor.

Suppose that the value of self-induction of two coils 4 and 4 is the same and that winding 5 at point a is divided into two equal parts; then when the key is open 6 potential difference between; points -8 will be equal to O, and current; in the condenser o will also be equal to 0; in the chain of self-induction 4-4, while

will flow current YL, the value of which will depend on the magnitude of the electromotive force E, induced in the coil 5 and the magnitude of the sum of the inductive resistance of the coils 4-4, equal to x1 .. thus

With the key closed 6

2 (ui

(see Fig. 2) the potential difference between the points a-in is no longer equal to O, and in the circuit of the capacitor o and key 6

E / A

current will flow: Us Us (OC 2o) s current, while, in coil 4, will double by the short circuit of coil 4: YL - So

as the capacitance current Y c, in the absence, is worn out of phase with respect to the self-induction current YL by 180 ° j, then in the short circuit circuit (switch 6) the current will be equal to the difference: YL - Us

HER

- - at XL 2 (sun or at

2сос

(Oi

a) ir (where ω is the angular rate of rerout

2 alternating current, L is the self-induction coefficient of the coil 4 V. O is the capacitor capacitance o, then we will have YL-Av 0 and in the circuit of key 6 the current will be 0; therefore, when opening the key 6, the volt arc should not form at the moment of rupture. Instead of transformer S-3 shown in FIG. 1, an autotransformer may be included in the antenna circuit, as shown in FIG. 3. Instead of key 6 in FIG. 1 and 3, a microphone can be switched on (directly or via electrode relays), in which case this circuit can be used for telephony without wires. SUBJECT OF THE PATENT. 1. A method of modulating or manipulating high frequency currents in a network, characterized in that a key or microphone 6 is connected in parallel to a loop 5, 4, 4 consisting of a coil, 5 connected to the network, and two identical coils 4 and 4 ; moreover, the middle point "a" of coil 5 and point "6 are interconnected by a capacitor .5, whose capacitance C satisfies the condition aL, where L is the coefficient of self-induction of coil 4 and w is the angular frequency of the current in the network (Fig. 1 and 2). A method in clause 1, characterized in that the coil i is replaced by a part of the network self-induction (ph. 3). g 2 2. Modification is characterized by the patent I.I. SHENFER