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== Practice Questions == Q: How are the two separate frequencies of a Frequency Shift Keyed (FSK) signal identified? :A: Mark and Space Q: Which of the following is an advantage of an NVIS antenna? :A: == background == === FSK === FSK is commonly used for caller ID and remote metering applications. FSK is also known as frequency modulation (FM). You will often hear the terms FSK and AFSK when talking about RTTY on the HF bands. FSK means Frequency Shift Keying and AFSK means Audio Frequency Shift Keying. MARK is always the higher RF frequency and SPACE is always the lower RF frequency. === NVIS === An NVIS antenna (Near vertical incidence skywave) is a horizontally polarized radiating element that is from 1/20th wavelength (λ) to 1/4 wavelength above the ground.

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