SU25530A1 - Radio receiver - Google Patents

Description

In the radio receiver according to the invention, a high frequency converter to an intermediate frequency, consisting of two lamps operating in a symmetrical arrangement, and a two-stroke resonant amplifier, connected between the high frequency local oscillator and the above-mentioned converter, are used. When using the device, it is meant, for example, to eliminate the effects of oscillations received from the antenna, as well as generated by the local oscillator in the circuits of those parts of the device that operate at an intermediate frequency and are located behind the frequency converter.

Similarly, in the case of using a modulating device for the purpose of receiving telegraphic signals transmitted on continuous waves, it is intended to eliminate the effect of a modulating low frequency on the high-frequency local oscillator.

In FIG. 1 depicts the scheme

frequency conversion devices;

FIG. 2-diagram of the amplifying device

and high frequency heterodyne coupling

and musical frequency generator

with a device for frequency conversion.

The frequency converter (Fig. 1) consists of two dual-grid lamps L and Z.2 working in a symmetrical scheme. The voltage from the high-frequency incoming oscillations is applied to the external Ge and Ge2 grids of these lamps, for example, through a tuned communication loop 5 ,. the inner grids G / j and G / 2 are short-circuited and voltage is applied to them from the high-frequency local oscillator L; the connection of the chain of these grids with the heterodyne H is carried out; by means of a transformer T. or in some other way. The filaments of both LI and / -2 lamps are connected to the metallic mass M (screen), which can be grounded. The ports PI and PZ are interconnected by means of a self-induction coil A, the midpoint of which is connected to the anode voltage source B; the second pole of this source is grounded (that is, connected to the screen M). Self-induction A with its capacitor shunting It forms a tuned circuit that communicates with the amplifier (lamps Ij, 12

gt intermediate frequency, (for example, simetrichny). The middle plate or plate system of capacitor C is also grounded. Between the grid and the anode I, on the one hand, and the Gez grid and the ano. House P, on the other hand, are equalization (neutrodin) capacitors L and M, neutralizing the effect of the internal capacities of the grid-anode of the corresponding lamps LI and /.o.

In a device that communicates a high-frequency local oscillator and a device for converting 1-frequency (Fig. 2), an oscillating circuit L of the local oscillator and a grid circuit of a frequency converter Gi are switched on a push-pull mode amplifier consisting of electronic, for example, three-electrode lamps K and Kg, included on a symmetric scheme. For simplicity, only one amplification cascade is depicted, although the number of such cascades can, of course, be any. The grids of the K and KZ triodes are excited from the VY loop of the local oscillator through any kind of communication; the drawing corresponds to the case of inductive coupling, carried out by the coil D, the midpoint of which is connected to the heating circuit, for example, through the mass M (ground). The jars of KI and KZ are connected to the oscillatory circuit E, which is connected to the input circuit of frequency converters, for example, grids and G / 2 (Fig. 1) by means of any element of communication, even coil J, associated with self-inducting circuit E. The midpoint of this last self-induction is connected to the anode battery via a secondary transformer O, the primary winding of which is excited by a local oscillator of a musical or low frequency. It is also possible to crank up the transmissions of the local oscillator of the music frequency by switching between an anchor battery and a loop of any other communication circuit.

Between the anodes of each of the lamps KI, K-i and the opposite ends of coil D, capacitors L and NI are connected to compensate for the internal capacitances of the indicated lamps.

The subject of the patent.

Claims (3)

1. A radio receiver, characterized by the cumulative use of: 1) a device for converting high frequency to intermediate, accurate frequency, consisting of two i and / .o lamps with two grids working in the symmetrical scheme, to one (for example, external) of which grids in opposite phases, the voltage is from incoming oscillations, and to others (for example, internal ones) in the same phases voltage from the high-frequency local oscillator H; 2) a push-pull resonant amplifier KI, EZ, connected between the high frequency local oscillator H and the frequency conversion device, on the output circuit of which amplifier is effected, for example, through a transformer O, from a low local oscillator (for example, musical frequency) in order to modulate the heterodyne and however, the intermediate frequency, whereby the received signals transmitted by continuous oscillations turn into tonal ones. 2. In the device according to claim 1 the use of equalizing capacitors, N2, connected between the anodes and grids of the lAMP amplifier and device for frequency conversion. 3. In the device of claim 1, using the midpoint grounding of both the inductive and capacitive branches of the oscillating circuit A, C, included in the anode circuit of the lamps that perform frequency conversion and connected to the intermediate frequency amplifier. to the patent of the inn of the company “General Company of Wireless Telegraphy .. Tzafi No. zoodU 2 j /. about uijj  / Ttgi