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Digital RF Field Strength Indicator

with LED display using Atmel AT90S2313 AVR Processor

Useful as a transmitter tune-up meter or an RF sniffer, this is an RF field strength indicator that is loosely based on the Broad Band RF Field Strength Probe, described elsewhere. It detects RF via a square law detector, basically its a crystal set with gain. The bias circuit for the detector is significantly modified from the probe to reduce the effects of battery voltage droop during use.

Main features:

- Wide bandwidth

- Digital display with auto zero

- Convenient in that it is self contained

- Very low parts count and low cost

- Battery-conserving power management

Follow the links for information on

The circuit

Firmware (includes assembler source)

Construction and use hints

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and noncommercial use only. This material (including object files) is copyrighted
by Richard Cappels and may not be republished or used directly for commercial
purposes without explicit permission For commercial license, click HERE.