The carrier must be reintroduced at the receiver by a beat frequency oscillator (BFO).

This technique is still used in radio telegraphy, the local oscillator now being called the beat frequency oscillator or BFO.

"Ceramic Filter Beat Frequency Oscillator", Naturemagics.com.

Carrier power must be restored by the receiving station to permit demodulation, usually by means of a beat frequency oscillator (BFO).

This makes for more efficient use of transmitter power and RF bandwidth, but a beat frequency oscillator must be used at the receiver to reconstitute the carrier.

Another leader in detector technology was Charles Garrett, who pioneered the BFO (Beat Frequency Oscillator) machine.

At the receiver, the received signal is mixed with a heterodyne signal from a BFO (beat frequency oscillator) to change the radio frequency impulses to sound.

The electromagnet is excited by stable radio-frequency alternating current produced by a local isochronous electro-mechanical oscillator known as a beat frequency oscillator or BFO.

Continuous wave (Morse code) and single sideband signals require a product detector using a so-called beat frequency oscillator, and there are other techniques used for different types of modulation.

A separate oscillator, sometimes called a BFO (Beat Frequency Oscillator) was known from the early days of radio, but was rarely used to improve the regenerative detector.

Later on, the airways were based on Low / Medium Frequency ground stations, like the beat frequency oscillator (BFO) and the non-directional beacon (NDB).

The "heterodyne" or "beat" receiver has a local beat frequency oscillator (BFO) that produces a radio signal adjusted to be close in frequency to the incoming signal being received.

A beat frequency oscillator or BFO in radio telegraphy, is a dedicated oscillator used to create an audio frequency signal from Morse code (CW) transmissions to make them audible.

On reception, the FSK signal is converted to the original tones by mixing the FSK signal with a local oscillator called the BFO or beat frequency oscillator.

Unlike the beat frequency oscillator or the induction balance machines which both used a uniform alternating current at a low frequency, the pulse induction machine simply fired a high-voltage pulse of signal into the ground.

The six-tube versions added either a RF amplifier tube, a push-pull audio power amplifier tube, or a beat frequency oscillator tube (to listen to Morse code or single-sideband modulation transmissions).

To recover the original signal from the IF SSB signal, the single sideband must be frequency-shifted down to its original range of baseband frequencies, by using a product detector which mixes it with the output of a beat frequency oscillator (BFO).

See HF/DF for a discussion of SIGINT-captured information with a MASINT flavor, such as determining the frequency to which a 'receiver' is tuned, from detecting the frequency of the beat frequency oscillator of the superheterodyne receiver.

It is designed to mimic the tone generated by a typical radio receiver when a CW signal is converted to the intermediate frequency (IF), then mixed with the Beat frequency oscillator (BFO) frequency to generate a difference frequency, which is audible over the radio receiver loudspeaker or headphones.