Acoustic indicator-sharpener in the receiver for hunting foxes. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Sound indicator-sharpener in the receiver for hunting foxes. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / radio reception

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There are many options for audible indicators-beam sharpeners for direction finding receivers. Another version of the sharpener is proposed, which contains only three parts: a capacitor, a varicap and a resistor.

On fig. 1 shows a fragment of the circuit of the Les-3.5 receiver with additional sharpener elements. These elements (R1, C1, VD1) are surface-mounted near telephone jacks.

Acoustic indicator-sharpener in the receiver for hunting foxes

The sharpener works as follows. The voltage from the phones through the resistor R1 is supplied to the varicap VD1. This varicap is connected to the circuit of the second local oscillator through a decoupling capacitor C1. Under the influence of the received signal, the capacitance of the varicap changes and affects the frequency of this local oscillator up or down, depending on which direction the receiver is tuned from the carrier frequency. Thus, the frequency of the received tone changes as the receiver rotates in space. The change in tone is especially pronounced during short-range search.

On fig. 2 shows a fragment of the drawing of the placement of parts on the receiver boards. No additional configuration is required on the receiver.

Acoustic indicator-sharpener in the receiver for hunting foxes

Authors: D. Bodrov, Y. Partin, Yekaterinburg

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