Simple field strength meter

  
The circuit is frequency selective. It has been used from 2 meters through 160 meters. The telescoping antenna may be adjusted to its shortest length when working at 2 meters to keep the needle on the scale, Meter should be a 100 microamp to a 500 microamp movement
Simple field strength meter - schematic

The diodes are germanium type, such as 1N34, etc. Silicon diodes will also work, but they are a bit less sensitive.




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