This circuit is Simple field strength meter that choose a specific frequency range.
It can be used to from 2 meter to 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. The diodes are germanium type, shuch as 1N34, 1N60, etc. Silicon diode will also work, but they are a bit less sensitive.
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