Super-regenerative receiver on the CB band. Scheme, description

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Super-regenerative receiver on the CB band. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Civil radio communications

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The detector receiver has low sensitivity, so a super-regenerative receiver may be useful in some cases. Such a receiver has a sensitivity of 10 ... 20 μV and allows you to receive CBS stations in AM mode at a distance of up to 1 km.

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The super-regenerative detector itself is assembled on the VT1 transistor. It simultaneously provides amplification of the high-frequency signal and its detection. In the collector circuit of the transistor VT1, the L1C3 circuit is turned on, tuned to the frequency of the received signal. This circuit is the only selective element of the receiver, so its selective properties are low. For a control receiver, this is more of an advantage than a disadvantage - several channels can be received without additional settings. Through the capacitor C1, an antenna is connected to the circuit. The antenna is a wire about 50 cm long.

A low-frequency amplifier is assembled on the VT2 transistor, the load of which is high-resistance headphones. For loud-speaking reception, the receiver should be connected to a low-frequency amplifier with an output power of 0,1 ... 0,5 W. The schemes of such amplifiers have been repeatedly published in amateur radio literature. The super-regenerative detector generates noise when there is no received signal. When a sufficiently strong (10 ... 20 μV) high-frequency signal appears at the receiver input, the noise disappears. The presence of this noise indicates the correct operation of the super-regenerator. In the absence of noise, the value of capacitance C4 should be selected. The receiver is tuned to the operating frequency by selecting capacitance C3 and compressing or stretching the turns of coil L1 according to the maximum volume of the received radio station.

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