# Mix of Sine waves with different frequencies

What is the mix of a received frequency 27 MHz and a oscillator frequency of 27.001 MHz?

I expect the mix of them would be 1 KHz.

• Beware of the language: summing frequencies is not the same as summing signals of different frequencies, which is also different from mixing two signals. Summing signals is a linear process, so you don't get new frequency components. Mixing is a non-linear process, so you get intermodulation components as explained by @pete-nu9w – Juancho Aug 10 '15 at 19:09