Radio frequency (RF) signals run from about 3kHz to 300GHz. As a test and measurement designer, some of my data acquisition rates will get into the 100s of kHz, or perhaps up to 10s of MHz with a digital oscilloscope, but usually that's all. I also typically try to use existing protocols for as much of the communication as I can, typically USB, Serial, GPIB, SPI, I2C or occasionally Ethernet, Wi-Fi or radio.
My focus comes from a desire to use as many mature technologies as I can to get to my test results quickly and inexpensively. But, I must also confess that one of my first projects after college graduation was randomly swapping components on a 915MHz capacitive sensor that no one in the company understood in the slightest. That was not the best introduction to the RF world.
However, RF is amazingly powerful, ubiquitous in our world and a valuable tool for any engineer. Sadly, my rough introduction and the high barrier to entry has kept me from digging too deeply into RF thus far in my career.
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