U.S. Army researchers are developing a quantum sensor capable of detecting electromagnetic emissions across frequency bands and at far greater ranges than traditional receivers and are considering ...

A Rydberg receiver and spectrum analyzer detects a wide range of real-world radio frequency signals above a microwave circuit including AM radio, FM radio, Wi-Fi and Bluetooth.A new quantum sensor can ...

A new quantum sensor can analyze a broad spectrum of radio frequency and real-world signals, unleashing new potentials for soldier communications, spectrum awareness and electronic warfare. A new ...

The circuit was designed to be able to obtain signals via amplitude modulation where the sensitivity and selectivity is fairly good. Amplitude Modulation AM – a method of emphasizing data on an ...

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.

VARIABLE condensers are now so commonly employed in radio receivers to tune circuits including a constant inductance that the use, some years ago, of variable inductances or variometers with fixed ...

This application note presents the frequency receiver design notes of the TH71101, TH71102, TH71111 and TH71112. It discusses crystal selection of the receiver, the LNA (RF amplifier) considerations, ...

Testing FM receivers is not that much different than testing other pieces of audio equipment. Appropriate tests include the big six: level, frequency response, THD+N, phase, interchannel crosstalk, ...

At Hackaday, we like to see build logs, and over on Hackaday.io, you can find plenty of them. Sometimes, though, a builder really outdoes themselves with a lot of great detail on a project, and ...

Marked: "Day-Fan Electric Company / Dayton, Ohio / Serial No. 089 / Type No. 5056". Unit is Tuned Radio Frequency receiver in a mahogany finish cabinet. Five Kellogg 401-A tubes are employed in a ...