VU3WMV · ham radio basics
റേഡിയോ തരംഗം ആകാശത്ത് തട്ടി, ലോകം മുഴുവൻ എത്തും! HF signals can travel thousands of kilometres because the ionosphere sends them back to the ground. Here is the short version.
Step by step
How HF propagation works
- What is HFHF means 3 to 30 MHz. It is also called shortwave.
- The ionosphereA layer above the Earth. The Sun ionizes the gas in it.
- The bounceThe wave hits that layer and comes back down, so it reaches places thousands of kilometres away.
- Day and nightUsually the higher HF bands work better in the day, and the lower bands at night.
- The SunWhen solar activity changes, which bands open also changes.
- Listen firstListen and find out which band has people on it.
Quick table
Time of day
| Time | Usually better |
|---|---|
| Day | Higher HF bands |
| Night | Lower HF bands |
Conditions change. What works today may not work tomorrow. Transmit only on the bands your licence allows.
Made for the Captain.Ramkumar reel series. This is a simple overview; real conditions depend on the Sun, the season and the time.
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