SU62090A1 - Receiver setting visual indicator - Google Patents

Description

In the receivers of frequency-modulated oscillations, the accuracy of tuning the set-point value is of great importance. This is due to the fact that, if the receiver is tuned accurately, the advantages of the frequency mod- um to combat various kinds of external interference and sovstv.mn.mp. Receiver will be realized more closely, and shrinking.

The existing schemes for switching on the optical indicator of tuning in the receivers of frequency-modulated oscillations, rather accurately indicating the correctness of tuning the middle of the transmission band, are complex.

A subject of the present invention is a visual indicator of setting up a receiver, a sufficient npocToii but an enablement scheme.

FIG. 1 and 2 depict the electrical circuit of the proposed indicator in two versions.

The proposed indicator for adjusting the frequency modulated oscillations is an alt-opio-optic indicator ("magic eye"), controlled by the output voltage of the discriminator. If the voltage of the un-oscillations is applied to the receiver input, then at the moment of fine tuning the DC voltage at the discriminator output is zero. With a breakdown in one direction or another, the voltage at the output of the discriminator varies both in magnitude and in sign. It can be seen from the diagram that this voltage is applied through the isolation circuits to the triode part of the 6P7 lamp; the anodic circuit of this lamp is connected to the univided electrode of the 6E5 lamp; This circuit is loaded with resistance. On the cathode resistance of Lamia 6P7 (Fig. 2), some initial offset is set (in Fig. 1, a battery is included in the grid circuit of the 6P7 lamp). At the moment of fine tuning at the anode of the 6P7 lamp and on the electrode electrode of the 6E5 lamp no. 62090

there is some potential. The voltage at the anode of the 6E5 lamp is chosen to be almost equal to the voltage at the control electrode, therefore the indicator is almost completely closed for three fine adjustments (a narrow gap is left). When detuning in either direction, the shift on the 6P7 lamp changes; 1 the current flowing through the lamp is changed, and consequently, the power of the control electrode also changes; it will either be a BbiHie or lower than the 6E5 aiod rate. As a result, the indicator will either open or overlap. This scheme allows the receiver to be precisely tuned.

For some improvement in the effect of the circuit on the triode part of the 6E5 lamp, an iair / kenis is supplied from the midpoint of the discriminator {Fig. 2). Thus, the exact setting corresponds to the moment when the indicator of the mail is completely closed (a narrow slot is left).

If necessary, the 6P7 lamina may be used as the first stage of the low-frequency amplifier.

In the drawing, plus (-d) and minus (-) L is the source of ayodoid voltage.

II redeme and 3 about b with t e and and

The visual indicator of the receiver tuning of the frequency-modulated oscillations with the use of an electron-optical indicator controlled by the discriminator output matrix, characterized in that the anode of the indicator is nodalized, the magnitude is almost equal to the constant multiplier on the control electrode at the exact time the settings on the station, and the control electrode, are strained from the anode load of the three-electrode lamp, the grid of which is connected to the discriminator's output, with the intention that, when misaligned, this or that The toronor was either revealed or overlapped.

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