# Propagation

### Explanation of question 28

Long-distance working on the HF bands is aided by

1. low-angle propagation
2. weak F-layers
3. sudden ionospheric disturbance (s.i.d.)
4. sun flares

The answer is :- 1 Low-angle propagation means a small angle subtended between the radio wave and earth, which will ensure a longer distance. With a large subtended angle (say 90º), the wave will be vertically upwards, and no horizontal distance will be covered.

BACK

page (tq2128ex)
Some material Copyright John Bowyer G4KGS.
Click here for important Copyright information
Web Space provided by Hostroute.com Ltd
Contact details