I built this radio as part of the ARRL ‘home brew challenge 3’. This followed the same block diagrams as those ... work without trying to invent a new circuit for each stage.” ...

Block diagrams close block ... They are easy to read and show how the circuit will work. Circuit diagrams close circuit diagramAnother name for schematic diagram. use simplified universal symbols ...

Photonic technology can now be used to construct miniature sources of high-frequency radio waves that have exceptional spectral purity. In the early 1980s, researchers at NASA's Jet Propulsion ...