Superheterodyne receivers have been mass-produced since around 1924, but for reasons of cost did not become successful until the 1930s. Before the second world war other, simpler receiver technologies ...

If you’ve ever built a crystal radio, there’s something magical about being able to pull voices and music from far away out of thin air. If you haven’t built one, maybe you should while there’s still ...

As discussed in Part 1 of this series, as the frequency of a single or coupled tuned circuits is increased, the selectivity decreases to the point that there may be insufficient selectivity at the ...

A six tube tuned radio frequency (TRF) receiver employing 201A triodes. Only one tube is in place. Circuit has three radio frequency stages, a detector and two audio stages with transformer coupling.

Amateur radio is the only hobby that offers its licensed operators the chance to legally design, build, and operate high power radio transceivers connected to unlimited antenna arrays for the purpose ...

New Si48xx AM/FM/SW Radio ICs Ease Design and Manufacturing for China's 115 Million-Unit-Per-Year Analog-Tuned Radio Market The wheel-tuned or "analog-tuned" multiband radio product market exceeds 115 ...

Also called a "tuned radio frequency" (TRF) receiver, it is a radio receiver that detects and demodulates the carrier signal broadcast by the station without using an intermediate frequency (IF) stage ...

Specimen is a TRF (tuned radio frequency) receiver utilizing five CX301-A tubes. Circuit appears to be two RF (radio frequency) stages ahead of a detector, and followed by two AF (audio frequency) ...

Last month we looked at radio at the start of the Great Depression and how RCA’s President David Sarnoff made the decision to license the heterodyne circuit to any manufacturer willing to pay ...

Silicon Labs Launches Most Integrated Multiband Receiver Solution for Wheel-Tuned Radio Designs New Si48xx AM/FM/SW Radio ICs Ease Design and Manufacturing for China's 115 Million-Unit-Per-Year Analog ...