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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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by Richard Cappels and may not be republished or used directly for commercial
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