Question
How does Q65 differ from JT65?
Answer Options
- A) Keyboard-to keyboard operation is supported
- B) Quadrature modulation is used
- C) Multiple receive cycles are averaged
- D) All these choices are correct
Correct Answer: C
Explanation
Q65 is a newer, highly optimized weak-signal mode, derived from the earlier JT65 mode, but specifically tailored for extreme weak-signal environments like Earth-Moon-Earth (EME) and tropospheric scatter. While both use time-synchronous exchanges, Q65 incorporates advanced receiver techniques to cope with the severe path challenges unique to EME.
The key difference in the receiver functionality is that Q65 implements a process where it averages the signal over multiple receive cycles (or repeated transmissions) to improve the ability to detect signals in deep noise. Q65 also supports multiple different submodes optimized for various scenarios, making it more flexible and capable than its predecessor for EME work.
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