| 1. | During poorer radio propagation periods morse code radiotelegraphy had to be used.
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| 2. | The number of these free electrons is sufficient to affect radio propagation.
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| 3. | The last three topics deal with radio propagation, aerials, and frequency measurement.
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| 4. | Austin's research focused on radio propagation and Fessenden's station at Brant Rock, Massachusetts.
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| 5. | The study of radio propagation allows estimates of useful range to be made.
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| 6. | In 1904 Austin joined the National Bureau of Standards to study radio propagation.
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| 7. | The project is to study radio propagation in the 40-m band in the ionosphere.
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| 8. | This led to the discovery of HF radio propagation via the ionosphere in 1923.
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| 9. | This permitted the first complete theory of short-wave radio propagation.
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| 10. | Radio propagation does not stop at national boundaries.
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