SU35265A1 - Device for switching from long waves to short - Google Patents

Description

Devices are already known for switching from long to short waves, equipped with a variable capacitor, the rotor of which is connected to the switch. Such devices have the disadvantage that the capacitors used in them do not allow a continuous change of the setting within all 360 ° of their scale. If, for example, the switch is placed on long waves and the capacitor is inserted completely, then a setting is obtained, equal to, say, 2000 m. Now, when removing the plates, the capacitance dies, and accordingly the wave decreases. Let the plates be completely removed and the setting corresponds to the shortest wavelength of the long-wavelength range, suppose that it is equal to 600 m. At this moment, a switch will take effect, which will switch self-induction to medium waves. Since the capacitor plate is drawn out completely, the tuning is obtained for the shortest waves of the mid-wave range, for example, 200 meters, i.e. the tuning will change dramatically from 600 meters to 200 meters. When inserting the plates, the wave will lengthen and at the maximum capacitance let's say 600 m; here the switch will work again and the setting will change immediately to 2000 m.

The present invention aims at eliminating this drawback by using in the above-mentioned device a capacitor with two fixed plate systems that are included in the circuit one after the other.

The drawing shows a diagram of a device that acts in the following way. Let, for example, the switch n be in the position corresponding to the tuning for long waves, and the movable plates from the differential capacitor are introduced into the system of “fixed plates, so that the tuning to the wave 2000 L1 is carried out.

When removing plates, the wave will decrease and with the smallest capacitance there will be a very short wave of the long-wavelength range, for example, a wave of 600 m. But, as soon as the moving plates come out of system a, a switch will come into effect which secondly, it will turn on the fixed plates b and, thirdly, switch self-induction to medium waves. In this case, the setting will not be 200 m, as it would have been in a conventional device, but 600 m, since the movable plates c will be fully inserted into the plates b, but 600 l /, will correspond in the analyzed example

longest wavelength range.

When moving the movable plates c out of the plates b, the capacitance will decrease, and accordingly the wave, which with a minimum capacitance will be equal to 200 m, will decrease accordingly. At this moment, the switch will be activated, which, first, will turn on the plates a, -second, turn off the plates b and switch the self-induction to long waves; the setting will be 200Q m, etc.

As can be seen from the description, the adjustment will occur continuously without any jumps.

The subject matter of the invention.

A device for switching from long waves to short waves with the use of a variable capacitor, whose rotor is connected to a switch, characterized by the use of a capacitor with two fixed plate systems connected one after the other in the circuit.