VHF stereo tuner. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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VHF stereo tuner. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / radio reception

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The tuner is assembled on a board measuring 7,5 x 5 cm. All fixed resistors are 0,125 W, the tuning resistor R5 is of the SP5-2VA type, the variable resistor R4 is of the SP1-A type. Capacitors - type KT7. Varicap VD1 can be replaced by KV901V. Instead of the KT3102E transistor, you can use any silicon, but with a high transfer coefficient. Coils L1 and L2 are wound on four-section frames with a diameter of 6 mm with a 600 HN trimmer. L1 contains 6 turns of wire PEV-2 0,25, L2 - 360 turns of wire PEV-2 0,12.

(click to enlarge)

Tuner specifications:

Received frequency range, MHz 67...108
Consumption current, mA, no more than 25

The tuning of the tuner consists in setting the L1 coil to the upper limit of the range (108 MHz). Resistor R1 regulate the required sensitivity. Resistor R3 ensures that there is no overload of the stereo decoder. Resistor R5 regulate crosstalk between channels.

In conclusion, it should be noted that too high sensitivity should not be set, as noise will increase.

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