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HF
4
geomagnetism
4
ionosphere
4
Q
3
Science
3
Antarctica
2
HF modem
2
SSN
2
channel sounding
2
ionospheric propagation
2
long-haul
2
long-haul link
2
modulation
2
observatories
2
physical layer
2
remote sensing
2
remote sensors
2
sounding
2
symbol error rate
2
synchronization
2
wideband communication
2
channel availability
1
ionospheric irregularities
1
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