en:bfo
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— | en:bfo [2021/04/19 21:22] (aktuell) – angelegt mb | ||
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+ | ====== BFO (Beat Frequency Oscillator) ====== | ||
+ | For the reception of unmodulated Morse code signals (in the early days of wireless telegraphy this was called " | ||
+ | This is done by the **BFO** (Beat Frequency Oscillator) or **heterodyne oscillator**. | ||
+ | |||
+ | The signal of the BFO is mixed with the intermediate frequency signal before demodulation. Depending on the frequency difference, the Morse code can be heard with a different pitch. With a difference of 1 kHz, the Morse code signals have a pitch of 1000 Hz; the pitch can be varied with the BFO control. | ||
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+ | At a frequency difference of almost 0, the frequency of the Morse code signal becomes so low that it becomes almost inaudible. This setting is not used for receiving Morse code transmissions, |
en/bfo.txt · Zuletzt geändert: 2021/04/19 21:22 von mb