Tone call device for radio stations. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Tone call device for radio stations. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Modernization of radio stations

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Not all radios have a call button that makes getting in touch easier.

On fig. 151 shows a schematic diagram of a sound generator made on a KR1006VI1 chip. The generator, when turned on, replacing the microphone, modulates the carrier of the radio station with a tone signal of a certain frequency (it depends on the resistance of the resistor R1 and the capacitance of the capacitor C1).

Fig. 151

Another version of the generator - on the K538UN3A chip - is shown in fig. 152. Here, the desired generation frequency is set by selecting the capacitance of capacitor C2.

Fig. 152

The generator is mounted on a small printed circuit board, which is installed directly in the radio station's PTT. A power source is also placed here - a galvanic battery of type 11A or 476A and an SB1 button - for example, a PKN61 type switch without fixation. On fig. 153 shows the possible placement of all elements of the ring generator in the PTT of the S-MINI radio station.

Fig. 153

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