SU36490A1 - Cathode generator - Google Patents

Description

In a generator of ultrashort waves using a three-electrode lamp, it is necessary to overcome the difficulties lying in the presence of parasitic capacitances of the anode and the grid relative to the cathode.

These capacitances at a very high frequency affect the distribution of the variable potentials of the anode and the grid relative to the cathode. In order to create the proper values of the amplitudes and phases of these potentials, it is necessary to resort to the inclusion of reactance in the cathode circuit. Since the self-excitation conditions for the same generator can change either as a result of a wave change or when the lamps are replaced, the indicated resistance must be variable in order to establish the most advantageous mode of the generator.

Until now, the mentioned resistances have usually been implemented as inductive catulums. In view of the fact that a current is flowing through them, these coils have to be made of larger wire, inconvenient for smoothly changing their reactive resistance, and reconcile with a deviation from the most favorable mode when changing, for example, a lamp.

(351)

The proposed new system of the generator device is devoid of these disadvantages. According to the present proposal, the creation of the necessary reactance in the cathode circuit is achieved by using a distributed capacitance and self-induction of the wires of the heating circuit. As is known, the reactance of a homogeneous circuit with distributed lossless constants and short-circuited at the end can be represented by the equation:

7 7 t X

 - f-o-y-g

Change the length of such a line in the range from O to -7, we get any

Zx value, both in magnitude and in sign.

Practical use of this property of the indicated line is provided by the present invention.

In the attached drawing of FIG. 1 and 2 depict forms of the device.

Wires 1 chain nakgla BYPOLCHH form of a straight line ssn e-gr :: ..: or parallel rods, along which slider 2 moves, giving

a relatively large capacitive coupling of any point of the glow wires with a clamped screen 3 of the generator 4.

The capacitance should be small for the generated frequency, since it plays the role of short-circuiting the line.

The experiments performed with the described si: the topic gave very good results; by selecting the length x each time the lamps were changed or the wavelength changed, it was possible to obtain a high efficiency factor, a large output power and a very stable generator operation, which were not achievable with commonly used droplets in the cathode circuit.

In order to eliminate the capacitive influence of surrounding objects, the wires of the cathode circuit, which create reactances, together with the slider, should be placed in additional screens that are fixed, for example, directly on the generator screen.

The subject matter of the invention.

Claims (2)

1. Cathode generator, mainly for ultrashort waves, characterized in that the wires of the cathode circuit are partially made in the form of rectilinear rods, along which a slider slides, giving a short circuit to any point of these wires with a grounded screen of the alternator capacitor of relatively large capacity, in order to create the most favorable reactance in the cathode circuit for a given generator mode. 2. The form of the cathode generator according to claim 1, characterized in that, in order to eliminate the capacitive influence of the surrounding bodies, the cathode wires that create the reactance, together with the slider, are enclosed in additional screens mounted on the common screen of the generator. . one SZEIG.Y J