SU22114A1 - A device for tuning a lamp radio - Google Patents

Description

The main patent No. 16275 describes a lamp radio receiver, in a tuning circuit of which a variometer mounted on a common axis, a variable capacitor and a switch are included. When the axis is rotated from 0 ° to 180 °, the setting is made using a variable capacitor (with the variometer closed by the switch), and with further rotation of the axis from 180 ° to 360, the setting is made by the variable capacitor and the variometer simultaneously. The present invention relates to the aforementioned radio receiver and consists in a different embodiment of the device for tuning.

In FIG. 1 is a top view of a switch; FIG. 2 is a side sectional view of it; FIG. 3 and 4 are diagrams of a custom circuit with various switch positions; FIG. 5 is a complete lamp receiver circuit with two tunable circuits.

In the tuning loop of the receiver, as in the device according to main patent No. 16275, there is a variable capacitor 15 mounted on a common axis, a variometer and a switch 1, which in parallel with the rotation of the axis from 0 ° to 180 ° connects the windings of the variometer from 180 up to 360 ° - consistently. In this way, a very large wavelength range can be obtained with one

control knobs only, with dead or short-circuited turns, as is usually the case with coils with switches. .

The switch is made in the form of a semicircular metal disk 1 {FIG. 1 and 2), fixedly mounted on the rotor axis. One side of the disk is covered with a layer of 2 insulating material. When the disk rotates from 0 ° to 180 ° (Fig. 3), the spring contact 3 slides over the disk and connects the ends of the movable and stationary windings of the variometer 4 and 5. The other ends 6 and 7 of the movable and stationary windings close at this time in pin 8 9. At this time, i.e. when the axis rotates from G ° to 180 °, the windings of the variometer are connected in parallel. When the axis rotates from 180 to 360 (Fig. 4), disk 2 does not touch contact 3, but enters between contacts 8 and 9, whereby its metal side touches contact 8, and it is insulated - contact 9. At the same time, the windings of the variometer are connected consistently. In a tube receiver with two circuits (Fig. 5), the primary loop variometer is connected inductively to the self-induction coil 10 of the antenna; the secondary circuit variometer is inductively coupled to the coils 11 and 12 of the anode circuits. In view of the fact that a variometer with rotation from 0 ° to 360 °, i.e., both with parallel and serially connected windings, changes as