Building the Ceramic Discrete Direct Conversion Receiver #4 -- The Mixer

I think the most important stage of a direct conversion receiver is the mixer.   This is the stage that takes the RF energy coming in from the antenna and -- in one fell swoop -- turns it into audio. It is important to understand how this happens.  I go into this in some detail in the SolderSmoke book.  To summarize:  1) You have two signals going into a non-linear device.  The way in which

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