Ham Radio General Class Practice Test

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What does the abbreviation "MFSK" stand for?

Manual Frequency Shift Keying
Multi (or Multiple) Frequency Shift Keying
Manual Frequency Sideband Keying
Multi (or Multiple) Frequency Sideband Keying

The correct answer is: Multi (or Multiple) Frequency Shift Keying

The abbreviation "MFSK" stands for "Multi (or Multiple) Frequency Shift Keying." This digital mode of communication utilizes multiple frequencies to convey information, allowing for the transmission of data in a more efficient and robust manner compared to single frequency systems. Each frequency represents a different symbol, enabling the encoding of multiple bits of information at once. MFSK is commonly used in amateur radio for its effectiveness in low signal-to-noise environments, making it popular for digital communications amongst ham radio operators. This method contrasts with systems like FSK (Frequency Shift Keying), which typically shifts between two frequencies for binary data transmission. By using multiple frequencies, MFSK can achieve higher data rates and improved resilience to noise and interference, making it suitable for various applications within amateur radio and beyond.