Ian Poole

Electronics Notes, now incorporating Radio-Electronics.com provides radio & electronics tutorials and notes covering basic electronics concepts, components, radio technology, constructional techniques, ham radio, & electronics history…
Electronics Notes is written and run by Ian Poole

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Ionosondes & Ionograms:   Ionosondes are used to determine the state of the ionosphere and help predict the optimum frequencies for HF radio communications.
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What's on ElectronicsNotes:

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Electronic components


Basic concepts


Circuits & circuit design

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Audio Visual

Antennas and propagation

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Technology History

History of the Vacuum Tube

Read all about the history of the vacuum tube or thermionic valve: initial discoveries, Fleming's diode valve, de Forest's Audion, the directly and indirectly heated cathodes, . . their rise and fall.