Thursday, September 17, 2009

Receiver Circuits

Much like the loudspeaker booklet, 18FR-2 "How Practical Requirements Changed receiver Circuits" has a historical tone. The National radio Institute published this booklet in 1938. This was before all-solid state ADLL circuits replaced analog tuners. But even then a long series of steps had taken place to achieve the relatively high-functioning devices.

I've written about PLL circuits, tuner development and coherers before. In some ways, the development if tuner circuits is the history of radio. This little booklet begins in 1856 with the Maxwell coherer and takes us through to the superheterodyne. It does stop briefly on power supplies a topic most-often ignored.

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