SU65500A1 - Ultra High Frequency Generator Lamp - Google Patents

Description

The object of the present invention is a lamp for generating ultrashort waves (VHF), operating with self-excitation according to a two-stroke scheme.

Consideration of the equivalent push-pull circuit, used to generate VHF (Fig. 1), shows that the oscillating circuit is formed by capacitances С Ag (anode grid) and self-induction mI LA and Lg between the anodes and grids. The feedback ratio (if we ignore the ground conditions) depends on the capacitance C k (anode-cathode) and magnitude; Zt between the cathodes of both laml. Obviously, the conditions for the possibility of self-excitation will remain if: one of the self-inductions of the oscillating circuit Ll or Lg is equal to 0.

Beli for a bit of reasoning accept. the circuit will be equivalent to the Colpitz circuit, and the feedback coefficient will be determined by the capacitance ratio CAk and Cgk. It follows that the self-induction of the grid or avodnoy branch can be zero, which allows a dual lamp to operate in a two-stroke circuit with one common electrode, the grid or anode.

FIG. Figure 2 shows the equivalent circuit of a generator whose self-induction with IG grids is 0. From the diagram it can be seen that all conditions for the occurrence of oscillations exist.

FIG. Figure 3 shows the proposed lamp for generating VHF, a feature of which is the use of two separate 4 to 5 cathodes, surrounded by one common grid 3, and two anodes J and 2, respectively located opposite to cathodes 4 and 5.

The cathodes 4 and 5 have separate leads connected to the ends of the feeder 6 Adjustable by the bridge 7. When connecting the anodes I2 to the conductor S, a circuit equivalent to that shown in FIG. 2

FIG. 4 shows a lamp design with cylindrical electrodes.

The advantages of the proposed lamp are a significant overall reduction in self-induction of the circuit for obtaining shorter waves and in the absence of a high-frequency potential on the grid, which makes it possible to simplify the grid output and even strengthen it on one foot with the cathode leads.

The proposed lamp can be made with a volumetric contour. In the generator lamp shown in FIG. 5, and 6 in two projections, the volumetric contour is a cylinder 9, to the inner surface of which anodes are attached 1 # 2 (flat or half-cylinders) with rods or pipes 10 and 11, which represent the main self-print of the contour. A common grid 5 is placed between the anodes - / and 2, surrounding two separate isolines of cathode 4 and 5, which are located opposite each of its anode. Conclusions 6 of the cathodes in the lamps are made in the form of a symmetrical line, having a continuation outside the cylinder 12 of the lamellae and tuning with the help of the bridge 7.

On the fit. 7 and 8 noKaisaH also in two projections, an embodiment of a lamp with an external circuit for obtaining high powers (better cooling). To obtain a shorter self-induction wavelength, 10 and / or contours are made in the form of cones or pyramids, which increases heat transfer and electrical conductivity and reduces self-induction. In the case of heating of the cathodes, the preheater can be general if the condition of its small capacity relative to the cathodes and symmetric arrangement is satisfied. To reduce: capacitance between the cathodes, the grid can be made "drawn out, as shown in fig. 9.

Oscillating circuits are known per se, which are designed to reduce the radiation in the entire two-wire feeder circuit, at the ends of which the anodes are located. The proposed lamp with

The purpose of using it to generate very high frequencies can be used as such an oscillating circuit.

As shown in phi1g. 10 and 11, each of the two-wire feeder wires is half cut along the pipe, and at the ends of the K € 1, two anodes I and 2 are fixed. Inside the common grid 5 there are two cathodes 4 and 5.

The leads of the Prisoe | Diiena cathodes to the wires of a separate tuning bridge 7: feeder 6.

FIG. Figure 10 shows a lamp arrangement with an inner loop where the anodes are the ends of the feeder. FIG. 11 shows the same device; in KOToipOM, the feeder (circuit) is brought out through the glass of the cylinder 12 by means of the fused wires 9K 13 and tuned by the bridge 14, which allows the generator to change the wave.

Subject invention

Claims (2)

1. Ultra-high frequency generator lamp, operating and with self-excitation in a push-pull circuit, characterized in that, in order to reduce the working wave length, two separate cathodes are used, surrounded by one common grid, and two anodes, each opposite to its cathode. 2. The form of the lamp according to claim 1, characterized in that the anodes are mounted on the ends of cylindrical, tapered, etc. rods that are diametrically opposed to the inside of the cylinder forming the volumetric contour of the lamp. FIG. one FIG. 2 SAN t sik