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 ...

The regenerative radio is long-ago superseded in commercial receivers, but it remains a common project for electronics or radio enthusiasts seeking to make a simple receiver. It’s most often seen for ...

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.

The following is excerpted from Chapter 8 of “RF Circuit Design, 2e” by Christopher Bowick. Moving up the scale in complexity, we come to the next evolutionary RF architecture: the ...

RF Central is now marketing a new digital microwave receiver targeted for ENG and other field uses. The new RFX-PMR-II model is available in both standard- and high-definition configurations and is ...

Silicon Laboratories has announced a multiband radio receiver IC solution that it claims will modernise wheel tuned radio products with digital displays. According to the mixed signal/analogue ...

My colleague Linley Gumm and I recently made an accidental discovery. When we turned our RF test bed on for a second day of testing of inter-band interference, all seven of our DTV receivers failed to ...

In Part 2 of RF Fundamentals, we will continue our discussion of measurement challenges associated with the RF signal chain. We will discuss swept tuned and FFT receiver techniques and optimization of ...

Marked: "Federal Telephone & Telegraph Co." / Buffalo, N.Y., U.S.A. / Type 57". Specimen is a TRF (tuned radio frequency) receiver with single RF stage, detector stage and two audio stages. A no. 30 ...