The plasma frequency,
(5)
is the most fundamental time-scale in plasma physics. Clearly, there is a different plasma frequency for each species. However, the relatively fast electron frequency is, by far, the most important, and references to ``the plasma frequency'' in text-books invariably mean the electron plasma frequency.
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Transmit RF frequency subtract to the Receive frequency
FM means Frequency Modulated.FM stands for modulation on frequency or frequency modulation.
Plasma. You have three liters of plasma out of five liters of blood. Plasma is mainly made up of water.
Plasma, in physics terms, is the fourth state of matter. It's form is similar to gas, but at extreme temperatures and energy, and shows the true colour of most elements when they are in their plasma form. Plasma is generally only found in the experimental Fusion reactors and in the stars themselves though due to the extreme requirements to create Plasma.
Mix it with a local oscillator whose frequency is (the IF frequency) away from the frequency of the FM signal you're interested in.