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This sketch will read RF power and SWR from any SWR bridge, designed to work on VHF UHF bands

Power and SWR Meter with dual bargraphs and sticky bar, using 2x AD8307

Inline RF Power & VSWR Meter. A DIY meter 0 to 30 Watt with Average and Peak. Circuit Description, Arduino Nano software code and part list to DIY your own Digital SWR Meter

The circuit is based on two AD8307 log amplifiers, which are connected to the forward and reflected ports on a directional coupler