The power detector is an Analog Devices AD8307 along with a 50-ohm input load. There is no filtering ... program to process the data from the Arduino. For example, here’s a plot of a 10 MHz ...

This means that while Raspberry Pi can function as a fully-fledged mini-computer capable of running multiple apps at once, while Arduino can only handle limited input and output controls.

Not according to [techtoys], who has created an Arduino shield that creates an HDMI output from an SPI control input. This is a project that seems to have been around for a couple of years ...