Short wave super reproduced receiver ----- Shortwave Radio

Short wave super reproducing receiver Author: Lu Wanghui The hyperbupler receiver has a high sensitivity, and the problem is whether it is suitable for short-wave reception. Super regenerative receiver is also easier. A RF oscillator is started to work on the frequency you want to receive. The difference between the hyperbupler receiver and the oscillator is only in the base circuit. As shown, a high resistance of a high resistance is used without a voltage divider. When the oscillation is sufficient to generate a strong negative charge which is repeated to the base, it causes a super-regenerative oscillation. If the regeneration band can be heard, the resistance and the capacitance value are adjusted until it reaches slightly higher than 20 kHz. Adjustment hears the sound of Shasha. The subsequent audio amplifier should have a lower high-end cutoff frequency, which can attenuate the regenerative signal at the output, enabling the useful signal through the audio band. Two transistors, 2 32Ω headphones in the circuit. The element value shown is suitable for receiving a 10-20 MHz band signal. The coil is used as a skeleton with a AA battery. The circuit produces strong sandhae noise, and the noise is reduced when receiving the station. The circuit has a high reception sensitivity and an external antenna is required. It can be powered with a 3V battery, but more than 9V volume. Another main advantage of super regeneration is that whether it is a strong station or a weakness station there is the same audio output, the signal to noise ratio is different. No volume adjustment is required. However, there is a disadvantage when receiving a short band, that is, interference is easily generated between adjacent stations. Its sound quality is better than a simple regenerative radio. However, there is no need to manually regulate feedback, which is difficult.

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