# Propagation

### Explanation of question 30

Long-distance working on the 2 m band is sometimes aided by

1. a strong F2-layer
2. tropospheric refraction
3. the Appleton layer
4. ionospheric scatter

The answer is :- 2 Under certain weather conditions a radiated wave of this frequency can be refracted such that it follows the earth’s curvature. It is known as tropospheric refraction, the troposphere being below the ionosphere.

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