We describe a modular power (SAR) monitor for multichannel systems whereby both the forward and reverse power of each channel are sampled and averaged on a dedicated board. Each board houses an inexpensive microcontroller with built-in ADCs for sampling the output of two power detectors. The microcontroller is programmed to perform time averaging, forward-reverse power subtraction and threshold detection. Multiple boards communicate simultaneously with a graphical user interface on a host computer.
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