SU40422A1 - Frequency conversion device - Google Patents

Description

Significant disadvantages of superheterodyne receivers are the significant number of electron tubes and the relationship between the settings of the circuits in the generator and detector tubes. Currently known devices that were intended to eliminate these shortcomings had their negative properties, namely: the complexity of the scheme, the difficulty of selecting the optimal mode, the use of unusual and complex in its design multigrid lamps, etc.

The present invention also aims to eliminate the aforementioned disadvantages and consists in the fact that the lamp used in the device for frequency conversion with a cathode, a grid, an anode and two additional anodes is switched on so that its triode part is used to generate oscillations, for detection. These anodes are connected according to the scheme of full-wave detection in such a way that the voltage of the oscillations from the local oscillator on both anodes coincide in phase, and the voltage from the frequency being converted is opposite in phase or vice versa.

In FIG. 1 and 2 depict diagrams of two variants of the proposed device.

In the diagram of FIG. 1 self-induction coil 7 serves to communicate with the antenna or

(345)

high frequency amplifier. The oscillatory circuit, consisting of a self-induction coil 2 and a variable capacitor 3, is tuned to the frequency of the incoming signals. At the midpoint of coil 2, coil 4 is connected inductively with an oscillating circuit in the local oscillator circuit (coil 5 and b and variable capacitor 5) tuned to a frequency different from the frequency of the incoming oscillations by the amount necessary to obtain an intermediate frequency. The self-induction coil 7, connected inductively with the coil 6, serves to excite oscillations in the triode circuit; In order to obtain separate detection and oscillation generation, an electron tube (7) was used, in which, besides the usual grid and anode cathodes, there are two additional small anodes. Detection and heterodyning occur in the chain of additional anodes. Capacitor 72 serves to freely pass high frequency oscillations. The potential difference of the intermediate frequency oscillations produced at the terminals of the resistance 75 is supplied to the grid of the amplifying lamp J4, into the anode circuit of which a tuned intermediate frequency transformer is connected.

FIG. 2 shows another variant of the same circuit in which the oscillatory

the local generator circuit is not connected to the grid circuit, but to the anode circuit. In order to improve the filtration of the intermediate frequency, the resistance 13 in the detector circuit is replaced by a self-induction coil 26, which together with the capacitor 27 forms an oscillating circuit tuned to the intermediate frequency. Self-induction coils 21 and 32 serve in conjunction with switches 22 and 34 for switching partial ranges. The proposed device, according to the author, has the following advantages:

1) the oscillation frequency of the local oscillator does not depend on the change in the tuning in the high frequency amplifier and the detector lamp;

2) the frequency of oscillations of the intermediate frequency, which is obtained, and c as a result of the joint detection of oscillations of the local oscillator and the arrival of their signals, does not depend on the magnitude of the amplitude of the incoming signals;

3) the detector lamp does not overload with the possible signal strengths in the practice of conventional reception;

4) optimal heterodyning mode is easily selected and maintained.

in a wide range of detector generator settings;

5) interference with other receivers, produced in conventional superheterodyne, is dramatically reduced due to the emission of part of the energy of the local oscillator;

6) the intermediate frequency amplifier is not loaded with oscillations of the local oscillator.

The subject matter of the invention.

Claims (2)

1. A device for frequency conversion, characterized in that a lamp having a cathode, a grid, an anode and two additional anodes is included so that the triode part of the lamp is used to generate oscillations, and two additional anodes for detection, and they are included according to the full-wave detection scheme and so that the oscillation voltages from the local heterodyne at both anodes coincide in phase, and the voltages from the frequency being converted are opposite in phase or vice versa. 2. When the device according to claim. 1 is included in the detector circuit circuit, tuned to an intermediate frequency.