DE1258484B - Coordinable management team in lambda / 2 technology - Google Patents

Description

A / 2 Tunable Circuitry The present invention concerns a coordinated management group in R / 2 technology, in which the vote through one at one end of the inside. Conductor connected capacitor with changeable Capacitance value takes place and in which an adjustment of the tuning characteristics is carried out one trimmer capacitor each connected in the area of the two ends of the inner conductor is made possible.

In such known tunable resonant circuit arrangements are Rotary capacitors have been used to tune the oscillating circuits. The vote and the synchronization of several oscillating circuits takes place at the lowest receiving frequency by the trimmer capacitor facing away from the variable capacitor, and .the vote or the synchronization at the highest frequency to be received is carried out by the trimmer capacitor connected to the variable capacitor. The synchronization within of the frequency range between the lowest and the highest frequency through the feathered rotor rim plate.

Lately there are voting and voting in larger ones Frequency ranges used capacitance-varying diodes. Because these in their values scatter and are also not continuously adjustable, it is necessary, to design the synchronization in a different way. According to the invention, this is done by that when using a non-adjustable capacitor with variable capacitance, in particular a so-called capacitance diode, which enables three-point adjustment is that the inductivity of the inner conductor is designed to be adjustable.

This allows a three-point adjustment to be carried out in a simple manner in which with the two trimmer capacitors at the two corner frequencies can be precisely adjusted and by changing the inner conductor inductance to a third point in the middle of the tunable frequency range is exactly matched.

It is already known from the patent 1187 279 to achieve a basic adjustment to change the inner conductor inductance by adding a The position of the changeable conductor is electrically connected in parallel with the inner conductor. the special application on an A / 2 line circuit and there to achieve a three-point adjustment however, using two trimmer capacitors at the same time does not result in this refer to.

Further advantageous details of the invention are given below described with reference to an embodiment illustrated in the drawing.

1 with an inner conductor is designated, at one end of which a junction trimmer 2 and at the other end of which a junction trimmer 3 is arranged. In the area of the connection of the junction trimmer 3, a capacitance variation diode 4 is also connected, the capacitance value of which can be changed via a control voltage UD. A blocking capacitor 5 is used to block the control voltage UD. Since the capacitance variation diode 4 cannot be adjusted, the inner conductor can be adjusted according to the invention in that a conductor loop 6 is connected parallel to the inner conductor 1. Depending on the selected distance, which can be adjusted, for example, by bending the conductor loop 6, the resonant circuit can, in addition to the lowest frequency using the junction trimmer 2 and the highest frequency using the junction trimmer 3, also pass the conductor loop exactly at another point within the frequency range adjusted to the required value. By means of this three-point adjustment, the value of the capacitance-varying diode can vary somewhat compared to one present in another resonant circuit and, nevertheless, synchronization between the two circuits can be achieved.

Instead of the conductor loop 6, one in the figure The tunable inductance 7 shown in dashed lines is connected to the inner conductor so that the inner conductor inductance can be adjusted.

This arrangement according to the invention provides the possibility of an almost exact synchronization between two coupled to a band filter Oscillating circles and possibly also to produce an associated oscillator.

Claims (3)

Claims: 1. Tunable management team in 2/2 technology, at which is matched by a capacitor connected to one end of the inner conductor with changeable capacitance value takes place and with which an adjustment - the tuning characteristics by a trimmer capacitor connected in the area of the two ends of the inner conductor is made possible, characterized in that - when using a non-adjustable Capacitor with variable capacitance (4), in particular a so-called capacitance diode, a three-point adjustment is made possible by the inductance of the inner conductor (1) can be adjusted. 2. line circuit according to claim 1, characterized in that the inner conductor inductance by a known per se, parallel to the inner conductor (1) connected conductor loop (6) can be adjusted ». 3. Management group according to claim 1, characterized in that the inner conductor inductance by an adjustable, The inductance (7) switched to ground can be adjusted in the area of the connection of the adjustable capacitor of variable capacitance (4) to the inner conductor (1) or in the area of the voltage node of the inner conductor (1) connected to this is. Publications considered: German Auslegeschriften Nr. 1183 560; 1187 279; German utility model No. 1904 067; "Funkschau", 1966, H.1, p. 13 to 15.