Encyclopedia of radio electronics and electrical engineering / radio reception

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The main advantages of regenerators are their simplicity and low cost. But the grid circuit of the lamp in such a cascade works like a diode detector, and the current flowing in its load degrades the Q of the output circuit. A decrease in Q means a decrease in the selectivity and gain of the receiver, that is, the loss of the main advantages of the regenerator.

In addition, the grid current of the regenerator lamp changes with the change in the modulation factor, so the feedback in a conventional regenerator depends on the value of the instantaneous modulation factor. When the receiver is tuned to a station, the feedback must be set in the receiver so that the receiver provides the appropriate gain, but at the same time, the receiver must not oscillate. However, when receiving weak signals, it is almost impossible to completely avoid radiation in a conventional regenerator. In this case, the receiver tuning has to be carried out simultaneously with two knobs, which is a great inconvenience.

The disadvantages of a conventional regenerator were avoided in the device, the scheme of which is shown in Fig. 1. Here the input circuit is electrically separated from the regenerative lamp, and its influence on the setting is excluded.

Fig. 1

The left half of the lamp according to the scheme is a cathode follower lamp; its gain is less than unity, and the distortion in it is very small. From the cathode resistance R1, the RF voltage is applied to the grid of the second half of the lamp; a feedback coil is included in its anode circuit. Thanks to this, it was possible to avoid the shunting effect of the grid circuit of the lamp on the input circuit.

Potentiometer R6 is used to set the constant feedback; in the process of tuning the receiver at the station, its engine remains invariably in the same position. Tuning the receiver at the station is thus carried out with one knob - the loop tuning knob. The range overlap depends on the values ​​of L2 and C2.

Assembled according to the diagram in Fig. 1 device can be used as the first stage of a regenerator or a highly sensitive superheterodyne stage. The L2C2 circuit in this case must be tuned to the same frequency as the superheterodyne antenna circuit. The sensitivity and selectivity of the superheterodyne is greater than when using a conventional two-tube RF amplifier.

The device can also be used as a regenerative detector. Headphones should then be connected to its output. If a low-frequency amplifier is used after the regenerative detector, then the capacitance C6 should be 0,01-0,1 microfarads.

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