The beat frequency oscillator was invented in 1901 by Canadian engineer Reginald Fessenden.
2.
The audio tone is usually created by use of a beat frequency oscillator.
3.
In order to make the carrier pulses audible in the receiver, a beat frequency oscillator is used.
4.
Reduction of the carrier level permits higher station to permit demodulation, usually by means of a beat frequency oscillator ( BFO ).
5.
Vacuum tubes were used by some of the older technologies popular in the 1960s and 70s, like beat frequency oscillator ( BFO ) detectors.
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Later airways were based on low / medium frequency ground stations, like the beat frequency oscillator ( BFO ) and the non-directional beacon ( NDB ).
7.
The heterodyne oscillator is the ancestor of the " beat frequency oscillator " ( BFO ) which is used to receive radiotelegraphy in communications receivers today.
8.
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.
9.
Today the heterodyne method is still used to receive CW signals, and the " beat frequency oscillator " ( BFO ) is a standard part of all communications receivers.
10.
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 ".
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