VHF converter from 128-148 MHz to 88-108 MHz. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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VHF converter from 128-148 MHz to 88-108 MHz. 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 absence of tuning elements greatly simplifies the design of the transducer, since tuning is done by the receiver itself. The converter uses a K174PS1 chip, which has good decoupling between the local oscillator signal and the input signal. Therefore, even strong input signals slightly detun the local oscillator. The microcircuit is not critical to the supply voltage, as it contains a built-in voltage regulator.

VHF converter from 128-148 MHz to 88-108 MHz

The frequency of the local oscillator is determined by the parameters of the circuit L1, C4. The input signal is fed through the capacitor C1 to the input of the frequency converter. At the converter load, resistor R3, the total and difference components of the signal are distinguished. The local oscillator frequency is set to 40 MHz. When using a receiver with a range of 88-108 MHz, the difference frequency is used, and the total frequency is filtered out by the input circuits of the receiver. In our case, using a converter, the range of input signals from 128 MHz to 148 MHz is covered. If necessary, you can overlap other ranges by changing the frequency of the local oscillator. The DA1 chip is operable up to a frequency of 200 MHz.

Coil L1 is wound on a tuning core from the SB-1a magnetic circuit and contains 5 turns of 0,3 mm PEV wire, wound round to round. The DA1 chip can be replaced with K174PS4 or its analogue SO42P.

Setting up the converter comes down to setting the local oscillator frequency by changing the inductance of the coil L1.

Author: V.Adrianov

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