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- -- card: 40626 from stack: in
- -- bmap block id: 0
- -- flags: 0000
- -- background id: 2707
- -- name: #155
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- -- part contents for background part 20
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- Question #155
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- N3A07 When a signal is returned to earth by the ionosphere, what is this called?
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- Sky-wave propagation
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- Earth-moon-earth propagation.
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- Ground-wave propagation.
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- Tropospheric propagation.
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- Correct answer is A
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- ARRL Handbook Chapter 22