My favorite way of abstracting radio architecture is to consider everything at the block diagram level: filters, amplifiers, multipliers (or mixers as we call them), and assume all blocks are ...

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.” ...

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 ...