SU24912A1 - Radio receiver using neon lamp as detector - Google Patents

Description

The present invention relates to a radio receiver in which a neon lamp is used as a detector. According to the invention, a bulb is connected to an antenna circuit, which is brought to the ionization threshold by means of a direct current source connected in series with it.

In FIG. 1 shows a radio receiver; FIG. 2-characteristic neon lamp; FIG. 3 and 4 are the voltage and current curves of the lamp.

A high-frequency resonant circuit P connected between antenna A and earth 3 is inductively connected to a second circuit in which a neon lamp G having the same electrodes is connected in series with the telephone T, battery B and potentiometer P. If gradually, starting from 0 volt, to increase the voltage at the terminals of the neon lamp, the current through the lamp will not go until the voltage applied to the lamp reaches the definite Epc limit. At this point, the point in FIG. 2) a well-defined current is immediately established in the lamp circuit. As the voltage increases further, the current will also increase. The law of current increase is represented by a graph; in FIG. 2 (solid line). If then, starting at about 150 volts, gradually reduce

voltage, the current will also decrease, and the law of current decrease will be the same as with an increase in voltage, i.e., both curves will coincide. The only difference will be that the lamp, will go out at the point B, corresponding to the voltage Eoc, - less than the voltage En.

In the proposed radio receiver, the neon lamp property just described is used. With the help of a potentiometer, the lamp terminals establish a voltage Ep, a slightly lower voltage Epc, and a slightly higher voltage Eoc (Fig. 3). Then the signals arriving from the transmitting radio station with amplitude en will add up with a constant voltage En at some point a (Fig. 3) in total will give a voltage greater than Epc, as a result the gas in the lamp will be ionized and a current J will flow through it (Fig. 4,. Moment a). The next moment in at; When the second half-wave of transmitted oscillations arrives, they together with the voltage En will give a voltage equal to Eos, as a result of which the current will stop. Then, at the moment of a, the current is again wits and at the moment of time in again it stops.

Thus, the current will flow through the lamp in only one direction. The proposed radio receiver is intended to receive high frequency signals of the order of microvolts.

PRE ..etGJi, 5p etheni.

A radio receiver using a neon lamp as a detector, unlike the fact that a neon lamp G,

having the same electrodes, including a check in the circuit connected to the antenna, successively with a source of direct current B, bringing the lamp to the ionization threshold, and the telephone T.