SU27117A1 - Supersregenerative radio - Google Patents

Description

The main disadvantage of a superregenerative radio receiver is the characteristic noise heard in the telephone when there is no signal or very weak signals that do not give a sure connection. This noise is a serious psychological obstacle in the operation of a super generative receiver. The present invention aims to free the receiver from this noise without harm to the rest of the receiver.

A study of the phenomena in the superregenetive receiver shows that the average value of the anode current undergoes the following changes .. In the absence of a signal, this average anode current is the largest and subject to very strong changes (which give a sound to the phone that causes noise). , With a signal, the average anode current drops; the stronger the signal, the lower the average anode current. Simultaneously with the amplification of the signal, the spontaneous oscillation of the average anodic current decreases, as a result. one gets the impression that as the signal is amplified, the noise is attenuated.

Thus, the two phenomena run in parallel and can be considered functions of one another: attenuation of noise and reduction of the anode current. Therefore possible

use one of these phenomena to control the second. It is most convenient to apply after the superregenerator a non-linear amplification controlled by an average anode current, so that when the average anode current is large, the gain increases. As a consequence, spontaneous noise observed in the absence of a signal is not subject to amplification, while the signal will be significantly amplified. .

According to the invention, the two transformers of the supergenerator of the supergenerator, connected in series in the anode circuit, have only one of them with an iron core, the secondary circuits are connected in series with each other and are connected to each other in the grid circuit of the amplification lamp so that in the absence of voltage signals on the grid the lamps were zero, and the signals that change the magnetic saturation of the iron core, the grids of the lamps received an alternating voltage sufficient for amplification.

The drawing shows the proposed scheme, superregenerator. .:

The anode current of the superregenerative receiver 1 - 2, shown in the diagram conventionally, passes through the primary windings of two transformers 4 and 5, of which the first has a variable coefficient of mutual induction with the secondary winding, and the second contains a closed magnetic circuit made of ferromagnetic material. The secondary windings of these transformers are connected to each other and then connected to the grid of the input lamp 6 amplifier, the mutual induction coefficient in transformer 4 is selected in such a way that, if there is no signal, the resulting voltage on the grid of the lamp b is zero. At a signal, the anode current of the lamps. falls off. The magnetic properties of the transformer core 5 are changed, the compensation is violated and the signals (modulation) are passed to the amplifier 6.

The subject matter of the invention.

A superregenerative radio receiver, characterized in that its amplifying lamps 1, 2 connected in series in the anode circuit have 1, 2 two transformers 4, 5, of which only one has an iron core, the secondary circuits are connected in series with each other and interconnected to each other in the grid circuit of the amplifying lamp 6 with the goal that, in the absence of a signal, the voltage across the grid of the lamps 6 was zero, and with signals that change the magnetic saturation of the iron core., The grid of the lamp 6 received an alternating voltage sufficient to be amplified and .V