DE902019C - Ultra-short wave arrangement with pot oscillator and electron tubes coupled to it with a reduced ratio - Google Patents

Description

For devices with very short electrical waves

(Decimeter waves) are used as oscillating circles

• as is known, pot or cavity oscillators and arranges the electron tubes to be switched on in such a way that that the electrodes are as close as possible to the walls of these oscillating structures or Form parts of the walls themselves.

One is often in the choice of the starting point

determined by adaptation conditions. Is the

ίο connected electrode line low-resistance, like

z. B. the grid-cathode section of the three-pole tube £ (Fig. I) in the case of a cup-circle amplifier for decimeter waves, a reduced coupling is appropriate, ie the cathode k and the grid g are connected to the inner conductor / or the outer conductor. <4 of the Λ / 4-pot oscillator T is connected in the vicinity of the short-circuit transmitter of the pot oscillator located on the left in Fig. 1, while the anode bushing α is located outside of the pot oscillator T and protrudes into another oscillating structure there, if necessary.

When carrying out such an arrangement and using a tube with approximately planar Electrodes or disk-shaped electrode leadthroughs arise when you have the Want to arrange electrode bushings in the course of the pot ladder. It is Z. B. difficult, which is mostly to accommodate the longer tubular foot adjoining the cathode side without disturbing the field conditions as well as replacing the tube. From the anode side

Replacing is usually difficult because the anode is often in a further oscillating structure protrudes.

The invention avoids these difficulties in that, as Fig. 2 shows, for example, the pot oscillator is angled and the tube E from the short-circuit side of the pot oscillator through the hollow inner conductor part / 'of the leg of the angled pot oscillator connected to the short-circuit side in such a way is inserted through that the electrodes to be connected lie in the course of the inner conductor / "and the outer conductor A" of the other leg of the pot oscillator.

The disk-shaped cathode leadthrough S ^ is thus in the course of the inner conductor leg / ", the similarly constructed grid leadthrough S _g in the course of the outer conductor A". The tube base F _1, which contains the pump nozzle of the tube, the heating supply for the cathode and, if necessary, adjustment means for the distance between the cathode surface and the grid surface, is located inside the inner conductor leg / ', therefore completely in the field-free space. The tube can be easily inserted or exchanged through the opening O in the front plate of the pot oscillator. Since this opening is not located in a field-limiting wall part, it can neither penetrate the high-frequency field to the outside nor cause undesirable attenuation.

In the exemplary embodiment shown, the anode has a bolt-shaped design and can protrude into a further pot oscillator which directly adjoins the pot oscillator T. When changing tubes, the connection between the two pots does not need to be loosened.

The connection to the high frequency source Q, z. B. a receiving antenna, the voltage of which is to be amplified, takes place in the usual way through a coaxial coupling line L.

While the leg / ', A' suitably has a circular cross-section, the other leg J ", A" can have a flat rectangular cross-section, the larger rectangular sides of which are equal to the corresponding diameters of the circular cross-section, while the distance between the inner conductor and outer conductor is equal to the distance of the grommet S _g and Sfc. These flat passages then lie exactly in the course of the flat wall surfaces of / "and A". Such a design is particularly recommended for a two-stage or multi-stage amplifier, as shown in Fig. 4 in a perspective view and Fig. 5 in cross section.

Here, the pot legs facing the idle ends of the pot oscillators T ₁ , T ₂ , T ₃ with a rectangular cross-section lie directly on top of one another, but offset from one another in such a way that the anode bushing B _{1 of} the tube E _{1 is} close to the open end of the inner conductor of the pot oscillator T ₂ is, to which the following tube E ₂ is coupled with its grid-cathode section in the same way as E ₁ to T ₁ (or E to Tin Fig. 2). In a similar way, the anode bushing B _{2 of} the tube E _{2 is connected} to the open inner conductor end of the pot oscillator T _s . The connection is made purely capacitive for the purpose of DC voltage separation in both cases, the DC voltage itself being supplied via the wire lines L ₁ and L _{2, which are routed along the walls of the pot.}

The short-circuit-side legs of the angled pot oscillators are all facing the same side, in the present case facing upwards, so that the tubes can be easily inserted or replaced from the same side. The ring springs R ensure good contact between the pot transducers and the bushings.

To tune the three pot vibrators, capacitive tuning devices are used at the open ends, e.g. B., as already proposed, between the inner conductor end and the opposite end wall rotatable semi-cylindrical metallized rollers W ₁ , ffl ₂ and W _s . Since the operating axes A ₁ , A ₂ , A _{3 of} these tuning devices all appear on the same side (Fig. 4), lie parallel to one another on a straight line and are the same distance from one another, synchronous operation is easy to carry out.

The oscillation to be amplified is brought about by the coupling line L or a short line section to be connected to the actual cable , similarly to the first pot oscillator T _{1 in Fig. 2.} The degree of coupling can be set capacitively by means of the displaceable stamp S. The amplified oscillation is decoupled by a further line L ' , which is passed through the angled leg of the inner conductor of T ₃ . The plunger S ', which is longitudinally displaceable by means of screw threads, allows the degree of coupling of this decoupling line to be precisely adjusted.

To adjust the degree of coupling or the reduction ratio of the tubes to the pot oscillator, the electrical lengths of the legs facing the short-circuit end can be adjusted, e.g. B. by a displaceable punch (field displacer) or a roller-shaped or plate-shaped rotating body D (rotary trimmer) arranged between the inner conductor and outer conductor. The same setting device is expediently provided for in all pot oscillators.

Claims (4)

Patent claims: 1. Ultra-short wave arrangement with pot oscillator and stocky electron tube coupled to this, characterized in that the pot oscillator is angled and the tube (E) from the short-circuit side of the pot oscillator (Γ) through the hollow inner conductor part of the adjoining leg of the angled pot oscillator is gesteekt in such a way, that the electrodes to be connected lie in the course of the inner conductor (/ ") and outer conductor (A") of the other leg of the pot transducer (Fig. 2). 2. Arrangement according to claim 1, characterized in that that in an amplifier with a tube with three or more electrodes the the tube socket (F) adjoining the cathode leadthrough lies within the hollow inner conductor part (/ '), while the cathode leadthrough (Sj.) lies in the course of the inner conductor (/ ") and the grid leadthrough (S _g ) in the course of the outer conductor (A") and the anode leadthrough (B) is arranged outside the pot oscillator, optionally inside a further pot oscillator or cavity oscillator. 3. Arrangement according to claim 2, characterized in that in a multi-stage amplifier several angled pot oscillators with axially parallel and rectified legs are arranged side by side in such a way that the anode bushing (B) of a tube (E ₁ ) near the open end of the inner conductor of the The pot oscillator (T ) assigned to the following tube (E ₂ ) is located (Fig. 4 and 5). 4. Arrangement according to claim 1 or 3, characterized in that the leg adjoining the short-circuit side (/ ', A') of the pot oscillator is circular, the other leg (/ ", A") has a flat rectangular cross-section (Figs ). 1 sheet of drawings © 5694 1.