Simple KB receiver. Encyclopedia of radio electronics and electrical engineering

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The five-band receiver 0-V-2, the circuit of which is shown in the figure, is designed to receive amateur radio stations. The input (detector) stage on a field-effect transistor T1 operates on the principle of an “anode detector”, for this an initial bias voltage is applied to the gate. Due to the spread of field-effect transistor parameters, its value must be selected using resistor R5. The load of the detector stage is resistor R10. The feedback voltage and the low-frequency signal are removed from it for further amplification. The feedback coil L2 is a continuation of the loop L1. The data of the capacitor C1 - C4 are given in Table 1.

Table 1

Diodes D1 and D2 protect transistor T1 from high-frequency overloads. To reduce the influence of the parameters of various antennas on the tuning of the input circuit of the receiver, an input T-shaped three-terminal R1R2R3 with a constant input impedance of 60 Ohm was used.

(click to enlarge)

A two-stage bass amplifier loaded with high-impedance (4 kOhm) headphones is made in the usual way. A three-section RC filter is included at the input of the low-frequency amplifier, the bandwidth of which can be changed with the switch B2.

When constructing the receiver, the usual requirements must be observed. presented to KB receivers.

Coils L1, L2 for all ranges are wound round to round on frames with a diameter of 10 mm. Coil L1 for the first four ranges contains 2 turns, for the last - 5; coil L2 for the first range contains 8 turns, for the second - 9, for the third - 16, for the fourth -26 and for the fifth -64. For winding, a wire with a diameter of 0,35 mm (for a range of 80 m) and 0,5 (for the rest) is used. Trimmer cores - ferrite with a diameter of 1,25 and a length of 17 mm.

Transistor 2N4416 can be replaced by KP303 with any letter index. Bipolar transistors VS108S are best replaced with silicon transistors KT313B, KT315G, KT315E. Instead of a ZP3,6 zener diode, you can use D813A or KS156A. Diodes 1N914 can be replaced by D104.

Literature

1. "Das DL-QTC" (Germany), 1971 No. 11.

Publication: N. Bolshakov, rf.atnn.ru

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