Question
How are the two separate frequencies of a Frequency Shift Keyed (FSK) signal identified?
Answer Options
- A) Dot and dash
- B) On and off
- C) High and low
- D) Mark and space
Correct Answer: D
Explanation
In Frequency Shift Keying (FSK) modes, two distinct radio frequencies are used to represent the two binary states of the data. For traditional FSK RTTY, these two frequencies are always referred to by specific, standardized terms.
These terms are mark and space. The ‘mark’ frequency traditionally represents the binary ‘1’ state, and the ‘space’ frequency traditionally represents the binary ‘0’ state. The difference between the mark and space frequencies is called the frequency shift (e.g., 170 \text{ Hz} for standard RTTY).
This topic was automatically created to facilitate community discussion about this exam question. Feel free to share study tips, memory tricks, or additional explanations!