Kaomojis
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#radio propagation
#ionosphere
#signal reflection
#shortwave radio
#HF radio
#over the horizon communication
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#echo sounding
#sonar
#depth finding
#acoustic measurement
#marine survey
#signal reflection
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#sonar ping
#transducer signal
#underwater acoustics
#signal reflection
#listening for echo
#radio propagation #ionosphere #signal reflection #shortwave radio #HF radio #over the horizon communication