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.
12.
If you want to receive single side band or Morse code make sure it has a beat frequency oscillator . talk ) 21 : 30, 3 December 2011 ( UTC)
13.
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 magnetized the ground with a relatively powerful, momentary current through a search coil.
14.
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 . It consists of two chambers in the center of which is placed a vibrating membrane.
15.
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.
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The heterodyne oscillator had to be retuned each time the receiver was tuned to a new station, but in modern superheterodyne receivers the BFO signal beats with the fixed intermediate frequency, so the beat frequency oscillator can be a fixed frequency.
17.
Another advantage of the circuit was that the tube could be made to oscillate, and thus a single tube could serve as both a beat frequency oscillator and a detector, functioning as a heterodyne receiver to make CW radiotelegraphy transmissions audible.
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The tone wheel acted as a crude beat frequency oscillator ( BFO ), introducing a second radio frequency which combined with the received signal to create a " beat " ( heterodyne ) frequency at the difference of the two frequencies, in the audio range.
19.
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.
20.
A "'tonewheel "'or "'tone wheel "'is a simple electromechanical apparatus for generating electric musical notes in electromechanical organ instruments such as the Hammond Organ . by Rudolph Goldschmidt and was first used in pre vacuum tube radio receivers as a beat frequency oscillator ( BFO ) to make continuous wave radiotelegraphy ( Morse code ) signals audible.
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