Stage 1 of 6
LEARN
Hearing a station is not a simple matter of more power. On VHF and UHF, this course starts with line of sight: terrain and antenna height can open or block the path.
Labs · 07
Propagation & Range
Line of sight, terrain, antenna height, VHF/UHF behavior, introductory HF propagation, and repeaters.
NOT STARTED
Lab workspace
Work through the six stages. Try the controls. Nothing here receives or transmits a real radio signal.
Stage 2 of 6
SEE IT
A ridge can stay in the way no matter how much transmitter power you add. A repeater can relay. HF can reach past the horizon when the ionosphere returns a signal, and that return is not guaranteed.
Stage 3 of 6
DO IT
Use the path drawing. The label is the result of this model, not a coverage prediction.
Stage 4 of 6
EXPLAIN IT
Why can antenna location sometimes improve communication more than simply increasing transmitter power?
Stage 5 of 6
EXAM CONNECTION
RADIO LAB PRACTICE. These questions are about the path model you just used. They are not official exam questions.
Stage 6 of 6
FIELD TASK
You are on a summit. A friend is in the valley, with a hill on the direct path. Another station is beyond a ridge. Use the drawing. Open the valley path, then the ridge path. More power is not the strategy.