SU31305A1 - The method of stabilization of the cathode generator - Google Patents

Description

Frequency stabilization by the action of an oscillating circuit introduced into the lamp oscillator circuit is mainly determined by the dependence of the current phase and voltage, which is almost tuned to the oscillating circuit resonance, on frequency.

The smaller the damping of the oscillating circuit, the greater the phase shift when the oscillations deviate from the natural frequency of the oscillating circuit, and, consequently, the greater the stabilizing effect of the latter. It would still be increased if it were possible, by means of some kind of phase amplifier, to multiply the initial value of the phase displacement in this circuit several times.

According to the present invention, this is achieved by the fact that the current required for feedback is taken from the anode circuit of the generator tube through two elements of this circuit, in which the currents have a mutual phase difference depending on the frequency; in this case, the current taken from both of these feedback elements is used to form a harmonic

MONICs, which are superimposed on each other, to produce beats, by means of joint straightening, and provide an alternating current of the fundamental frequency applied to the grid circuit of the generator lamp.

In the proposed drawing of FIG. 1 represents an exemplary scheme with which the proposed method is carried out; FIG. 2, 3, a modification of the circuit of FIG. one.

Let oscillator circuit 1 of the generator has the fundamental frequency md, which, under any influence, assumes the value w.

As a consequence, the phase of the current in the oscillating circuit 7 is displaced with respect to the anode current of the lamp 8 by an angle of 9. With a normal feedback, the angle would be a decisive factor counteracting the frequency change. However, in the diagram of FIG. 1, feedback occurs through lamps 9, 10, and 4. At the frequency of sho, the grid voltages in the lamps 9 and / O would be in phase; at a frequency of "), the corresponding phases are shifted with respect to each other

on the angle f. From the anode circuit of the lamp 9, a ninefold frequency (eg, cos 9 o t) is taken, and from the anode circuit of the lamp W, a tenfold frequency (eg, cos lOf), respectively, supplied to the grid circuits 5 to 6 of the lamp 4.

In this last one, a resultant frequency is obtained representing the difference

cos (ibcuf-f-lO -9wO cos (a) lOcp).

Oscillations of this frequency are then supplied to the grid circuit 7 of the first lamp 8, due to the presence of an angle of 10 "PJ stabilization, many times better than that achieved by conventional feedback.

By applying an even higher frequency multiplication, for example, when receiving in two stages x 35 or 36 times the fundamental frequency — the frequency stabilization can be improved accordingly, and 35 or 36 times the frequency again gives the lamp 4 the original main frequency with a phase shift of 36 s. .

It is quite obvious that any direct connection of the chains of the lamp 8 should be removed, therefore means should be provided to neutralize this connection, for example, to use a lamp with a shielded grid for this section.

FIG. 1, as communication elements from which currents are produced; The frequency-dependent phase shift is represented by: feedback and self-induction circuit 2, the impedance of which is neutralized by the sequential switching on of capacitor 3. However, it can also be switched on in parallel, and also replacing circuit 2 with just self-induction (or resistance or capacitance) .

In anodic current modulation schemes, it is equally possible to take the current required for feedback from a low-frequency modulator lamp 77 (Fig. 2) in series connection with a feedback loop. In this case, the steps of multiplying the frequencies | a (lamps P and / 0) are driven through the coupling capacitors.

In the modified scheme of FIG. 3, both communication elements, from which the current necessary for conducting feedback is diverted, are included in a common tuned circuit.

 The subject of the patent.

Claims (3)

1. A method for stabilizing a cathode generator with a generator lamp with feedback for sambo-excitation, characterized in that the high-frequency currents required for carrying out the communication are taken from the two communication elements provided in the anode circuit of the generator lamp so that they have different differences frequency dependent phases, the indicated currents are used to form harmonics, which are superimposed on each other, to produce beats, by means of joint straightening, and alternating current of the fundamental frequency, This is brought to the grid circuit of the generator lamp. 2. In the method of claim 1, applying a series connection of both elements, connection in the anode circuit of the generator lamp. 3. In the method according to claim 1, apply the parallel connection of both elements of communication in the anode circuit of the generator lamp. 4. In the method of paragraph 1, use a low-frequency modulator lamp as one of the elements of communication. to the patent of the company Lelefunken, the island of wireless telegraphy with an ogre. resp / № 31305