Field Strength Meter II

  
This project has 3 features. 1. It`s a Field Strength Meter, 2. A Frequency Meter and, 3. An aid for testing detuned transmitters. Its uses will become clear in a moment but firstly let`s go over the background of a Field Strength Meter. A Field Strength Meter is essential when designing and building transmitters. It provides signal strength values and allows us to compare and estimate the efficiency of a transmitter and its expected range.
Field Strength Meter II - schematic

The circuit consists of a tuned front end, an RF amplifier, two further stages of amplification, a diode pump and a transistor staircase. The circuit picks up RF energy on its 5cm antenna and passes it to a tuned circuit where all the frequencies, EXCEPT



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