SU31060A1 - The way radio reception undamped oscillations - Google Patents

Description

In many cases, for example, with radio reception, it is very convenient to reduce the current of the radio frequency by a factor of several times. In this case, when receiving it is possible to avoid using the beating method.

To reduce the frequency or divide it, a number of methods have been proposed, for example, using resonant circuits containing variable self-induction, capacitance or resistance, such as, for example, in the method of Mandelstam and Papaleksi. In this method, it is possible to halve the frequency. To obtain a more significant reduction in frequency, a number of cascades have to be taken here. So, to reduce the frequency by 12 times, it is necessary to take the number of stages equal to

m -i

If necessary, reduce the frequency by 64 times, there are already 6 stages.

The proposed method makes it possible to divide the frequency many times, for example, p, 10, 20 or more and, moreover, allows the frequency to be reduced to a fractional number.

195 times Due to this, to reduce the frequency by 100 times, it is enough to take only one cascade or two cascades.

For the implementation of the method, a known circuit, called a callarotron, proposed as an amplifier by Latour is used.

In FIG. 1 shows a circuit for carrying out the proposed method; FIG. 2 is a diagram explaining the operation of the device; FIG. 3rd modification ...

The anode current of triode 7, the anode of which is powered by battery 5, passes through resistance b. The grid of triode 7 is superimposed with the high frequency voltage received from the antenna. A grid circuit 4 is tuned to this frequency. In addition, this triode 7 can receive a bias voltage from a voltage drop in resistance 7, 8, which can be either purely ohmic or inductive. The impedance 7, 8 is included in the second triode circuit 2, the anode of which is powered by battery 70. When current passes through this lamp 2, current flows through resistance 7, 8, resistance 72, battery 7 (. Lamp 2 receives voltage on the grid from the resistance 6

lamp circuit 7. In addition, the battery W may charge the capacitor / 7. In this case, the charge of this capacitor passes through the resistance 72, mentioned earlier, and the capacitor discharge can go through the lamp 2 and the resistance 7, 8, creating a drop in the resistance 7, 8, locking the lamp 7.

The action of the scheme is as follows. . Suppose antenna 3 does not receive signals. In this case, the system described above, which is negative, can oscillate with a certain frequency (1), depending on the selection of the values of the capacitor 7 /, resistances 7, 8, 12, 6 and elements of the lamps 7 and 2.

Let the oscillation frequency of this system be acoustic. The curve of the oscillatory current passing through the resistance 7, S will be as shown in FIG. 2. If now antenna 3 receives a radio signal with a frequency of /, then on the grid of the lamp 7 there will be, on the one hand, a negative voltage created by the current flowing through the resistance 7, 8, and in addition, the voltage of the antenna 3 and Contour 4. The oscillations of the system will stabilize at frequencies that will be frequency dividers, otherwise, these oscillations with the fundamental frequency j will be subharmonic frequencies /.

In the case of proper selection of elements, the stabilizing effect of the signals of the frequency / will be sufficiently large. When changing the capacitance 7 / or the resistances 7, 8, 12, the 6 will change the ratio-- n, so that n all the time

a number from O to 300 and even more.

In addition, it is possible to establish such a regime; for cotbrom, the number n will be some constant, but not integer, but fractional. In view of the above, it is possible to receive even heterodyne transmitters that have a rather unstable wave without changing the current in the receiving telephone - and this reception is carried out in one cascade, with the resulting reduction in frequency being more than 100 times. With short waves, it is possible to use no more than 2 stages, similar to that described, which together can give a decrease in frequency more.

than 10 times. The resistance of the circuit (Fig. 2) may be ohmic or may be provided by the receiver telephone. Finally, it may be the primary winding of a telephone transformer or a low frequency amplifier. Condenser 9 (Fig. 1) in all cases contributes to synchronization and, in addition, can serve to change the reception tone.

From the described method of operation it can be seen that with this reception there will be a place for both „positive and„ negative signal, while „positive will be synchronized in frequency with the signal, but„ negative will not. By selecting elements it is possible to establish a sufficient difference in the height of one or another part of the signal so that it is possible to select a positive by adjusting the contours. In addition, “positive and negative tones can both be used if, when writing, the relay will have two windings, one of which will work from the circuit tuned to the frequency of the positive, and the other from the loop tuned to the frequency of the negative, and the action The windings on the measles relay will be opposite.

The device of FIG. 1 can finally be set up in such a way that the generation of acoustic frequency, circuits with triodes will take place only when — on the grid of the lamp 7, there will be a high-frequency voltage given by antenna 3 and circuit 4; without the same oscillations, the circuits generate will not.

With such a setting, this device will give only positive in the phone, as is the case with conventional beating systems.

The described reception system is distinguished by its significant i selectivity and, moreover, great independence from weathering.

In addition to the one shown in FIG. 1 of the circuit, obtaining a similar result can be achieved by applying the circuit, the g will be capable of relaxation oscillations. To do this, the lamps must be applied to the grid, by means of a loop-tuned signal, the voltage transmitted by the antenna, as shown in phi. H. Here, 2 is a double-mesh lamp, an 8-battery anode, a W-capacitor, a P-resistance, and a 7-

Welcome phone. Such a circuit, in the absence of a signal 8 to the antenna 5, can produce vibrations of the acoustic frequency or high. When an antenna receives a signal, these vibrations can change their frequency} this change can be made large enough to receive, the negative QT section of the positive. Oscillations in the presence of signals can be with frequency

such that -7-l, where l is an integer or,

/one

finally, the contour can have such elements that this relationship is not an integer

number, although it will be independent of the signal strength.

The subject matter of the invention. The method of radio reception of undamped oscillations using a callarotron, characterized in that, in order to reduce the frequency in one stage, the negative voltage generated by the discharge of the capacitor / 7 connected to the anode battery circuit is applied to the grid of the 1st lamp consistently with resistance 12.

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