Amateur ExtraE2D03

Which of the following digital modes is designed for EME communications?

D
Answer
Operating procedures and special operations
Type
A
MSK144
B
PACTOR III
C
WSPR
D
Q65

Answer Notes

Q65 is a digital mode introduced in the WSJT-X software suite specifically designed to excel at Earth-Moon-Earth (EME) communications, ionospheric scatter, and other weak-signal paths with fast fading. It uses 65-tone frequency-shift keying and is heavily optimized for the unique Doppler spread and rapid fading characteristics found when bouncing radio signals off the surface of the moon. The distractors serve entirely different purposes. MSK144 is intended for short bursts during meteor scatter, WSPR is a beacon mode used for propagation reporting, and PACTOR III is an error-free HF data mode used for messaging. None of these are optimized for EME.
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