VHF receiver with FM on a specialized microassembly KXA058. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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VHF receiver with FM on a specialized microassembly KXA058. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / radio reception

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This receiver is easy to set up and manufacture, and can be recommended for repetition by a wide range of readers. The receiver is based on the KXA058 microassembly, which contains a local oscillator, a mixer, an amplifier, and a detector. The receiver has a sensitivity from the antenna input of about 5 μV/m with a signal-to-noise ratio of 26 dB.

The schematic diagram of the receiver is shown in Fig.1.

Fig.1. Radio receiver on microassembly КХА058

The signal from the antenna is fed to the input of an aperiodic high-frequency amplifier made on a VT1 transistor of the KT3107 type. The amplified signal through the capacitor C3 is fed to the input of the microassembly DA1. It amplifies and demodulates the FM signal of the received radio station. The local oscillator frequency is determined by the parameters of the L1, VD1 circuit and the capacitor located in the microassembly. Tuning within the range is performed by changing the voltage on the VD11 varicap, which is removed from the engine of the resistor R7. The voltage to the resistor K7 is supplied from the internal stabilizer of the micro-assembly.

The LF output voltage from the output of the microassembly is fed to the input of the emitter follower on a VT2 transistor of the KT315 type. From it, the signal is fed to the B2 head phones or to the UZCH input with a sensitivity of at least 50 mV.

Transistor VT1 can be replaced with KT3128, KT361. Transistor VT2 - on KT3102. Instead of a VD1 varicap, you can use KV109, KV122, KV123. Coil L1 frameless, wound on a mandrel with a diameter of 3,5 mm. Coil L1 contains 7 turns of 0,4 mm PEV wire for the 68-80 MHz range or 3 turns for the 80-108 MHz range.

If you intend to use the receiver to work with one radio microphone, you can apply a fixed setting. In this case, elements VT1, R7, R8 can be excluded from the circuit, and a tuning capacitor with a capacity of 1-4 pF can be connected in parallel with the L30 coil, which will allow covering the entire required range.

Publication: N. Bolshakov, rf.atnn.ru

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