SU51343A1 - Magnetron modulation method - Google Patents

Description

Devices are known for modulating vacuum devices using magnetrons, in which the modulation is carried out simultaneously by the anode voltage and electric fields.

The peculiarity of the proposed modular modulation method of the magnetron magnetron is that the modulating voltages of the anode and the negatively charged auxiliary electrode inside the magnetron are absorbed in proton-negative phases.

In the drawing fng. 1 n 2 represent the curves of the electrical characteristics of the magnetron, and 3 and 4 show the nx circuits included. Fng. Figure 1 represents the modulation characteristic of a conventional magnetron in which the modulating voltage is applied to the anode.

The oscillatory current Is and the anode current 1h depend on the iodine voltage, if we assume that the rest of the conditions of the regime are chosen to be NHHMH. If the point X and the L- curve is chosen as the operating point, then the lamp cannot be fully modulated. Since the irradiating high-frequency currents are thermally loaded, the anode is made too large, because the anode current 1a anodic voltage, and the small oscillatory current Js increase simultaneously. The average anode current must be reduced, depending on the heating of the apode, so that the lamp cannot be used completely. Left branch characteristics: oscillatory current. as a function of anode nanodiagnes, it cannot be used for modulation if an upper limit is to be reached, i.e., the highest power of high frequency under optimal operating conditions. The foregoing explanation is fng. 3, where Ai n A2 - anodes n K - magnetron cathode. The values of the anodic field in P1) of the magnetic field, due to the absence of an equilibrium nonzero zero, the electron passes through the Si. If a high frequency variable field is added. then electrons go periodically once to apode Ai and another time to anode Ar.

The imposition of a constant anodic voltage, Ua, which modulates the pancreas of the M, is then obtained either by us or by a weaker acting anodic voltage. If the anodic nanowire (nrn of the nnol magnetic field) is strongly reduced, then the paths of the electrons are so distorted (curve Sj) that the high-frequency variable-voltage incidence can no longer produce current iodine current redistribution from one anode to another.

The result is an unexpected breakdown of oscillations. According to the invention, a combined modulation of the anode current and anode panplate should be applied in the magnetron, acting in such a way that at the same time it is modulated by the known anode method and simultaneously the anode current (emission current) using an auxiliary electrode located in the spontaneous proximity to the cathode . Both modulations must be provided in opposite directions in order to obtain a modulus characteristic, according to (). 2. A distinctive feature of image combirovany modulation is the reduction of the anode current under the action of the grid when the anode voltage is elevated, which occurs so that the production of laUa, i.e., and the heating of the anode at low and high high frequency currents remain constant and iridescent, And maybe ... small.

The similarity of modulation modulation still has the advantage that with decreasing anodic current 1a, the oscillatory current Is also decreases somewhat, so that the Is / Ua curve is steeper than with no additional current modulation by Is / Ua emission. A curve with a greater slope requires a lower modulating papruren to obtain the same degree of modulation as desired in order to obtain a better efficiency ratio. FIG. 4 shows an exemplary diagram of the proposed modulating device. A are the segmeite anode, divided into four pa

the parts, K is the cathode, which is hollowed in the form of a spiral, and H is the integral electrode in the form of a lipeipoy conductor located inside the spiral of the cathode. According to the invention, at the same time as a modulator, the modulation is modulated to the primary current by means of a special separate influence, and the inverted phase 180, in order to obtain the characteristic shown in FIG. 3. Both modulations operate at a high frequency, independently of each other.

Incremental modulation takes place due to the presence of an electrically controlling auxiliary electrode. On the anode nanowire L-Heppo, the modulating stress of the source M is laid in a normal way and the auxiliary electrode is applied in the opposite phase. If we look at the process from the point of view of obtaining high frequency oscillations, then in the modulating circuit we get an inclusion similar to a porous circuit of a triple-electrode lamp with a T feedback feedback transformer. Under certain conditions, i.e., the corresponding luminaire parameters and za rhei lgeii It is possible that the circuit is self-excited by iodine by the action of low-frequency feedback. This possibility can be used for various purposes, in particular to excite an auxiliary frequency or to reduce the attenuation of a low frequency circuit.

If you select a tonal frequency at the frequency, then a self-modulating transmitter is obtained, and the source of the modulating signal is saved. If lie, turn, locker use the auxiliary frequency as an oscillatory one to obtain a superrepegmental effect, then it must be chosen according to the choice of the super-audible.

The subject matter of the invention.

A method of modulating magnetrons with simultaneous modulation by anode voltage and with the aid of an auxiliary electrical zero, characterized in that the modulating voltage of the aiode and the injection of the negatively charged auxiliary electrode are in opposite phases.

to the patent of an inn-th firm- “Telefunken, the island of wireless telegraphy with ogre. rep. No. 51343

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