Should you trust your VSWR meter? asked an interesting question, and Should you trust your VSWR meter – detector linearity discussed a problem apparent in may VSWR meters.
This article illustrates one method of linearisation of the detector response of a practical VSWR meter.
Radio-kits SWR meter
This article contains an analysis of the analogue circuitry of the Radio-kits SWR meter.
The directional coupler at top left contains half wave peak detectors for forward and reflected waves. They are wired to the two compensated op amps at lower right (the connections are not shown on the circuit as the coupler may be remote, follow the terminal designations). Continue reading Should you trust your VSWR meter – linearisation