THE DETECTOR!

This is NRI Booklet 17FR-2, printed in 1939. It's titled "How Detectors Work in Sound and Television Radio receivers." It covers the fundamentals of how radio works, something that almost no laypeople understand at all. It covers concepts like demodulation, rectification, signal separation, diodes, grid-leak condensers, C-Bias Detectors, and some early heterodyne explanation. This is heavy duty and there is a lot of math.

But it's important. You don't have to be an engineer to understand what a crystal detector does. You don't have to be an engineer to understand that no D.C. bias is required to get zero output current when the input voltage is zero... but it helps.

You can get all 17.9 MG if you
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