Heterodyne resonance indicator at 1,8 ... 150 MHz. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Heterodyne resonance indicator at 1,8 ... 150 MHz. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Measuring technology

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For amateur radio measurements, you can use the heterodyne resonance indicator shown in the figure.

Heterodyne resonance indicator for 1,8...150 MHz

In the circuit, you can use transistors such as KP303 (VT1) and KT361 (VT2), diodes KD514.

The inductor data depends on the selected range. The original used a set of 6 circuits mounted on three-pin connectors.

See other articles Section Measuring technology.

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