Amateur radio band
From Wikiham, the ham radio free encyclopedia
An amateur band is a range of frequencies available for amateur operation under a country's rules. Band names often use wavelength, such as “20 metres”, while station controls normally display frequency.
HF, VHF and UHF
| Range | Frequency range | Typical characteristics |
|---|---|---|
| HF | 3–30 MHz | Ionospheric propagation can support contacts well beyond the horizon. |
| VHF | 30–300 MHz | Local and regional communication is common; conditions can enable much longer paths. |
| UHF | 300–3000 MHz | Terrain, buildings, antenna height and path clearance are often especially important. |
These are broad radio-frequency ranges, not a list of amateur allocations.
Why signals change
Radio propagation depends on frequency, the time of day, the season, solar activity and the path between stations. On HF, ionospheric conditions can open one band while another is unproductive. On VHF and UHF, height, obstructions and atmospheric conditions can strongly affect coverage.
Useful observations include the band, UTC time, station locations, mode, antenna and signal reports. Recording these details turns an unusual contact into a useful learning opportunity.
Band plans
For an operating frequency, check the rules published by your national regulator and the current band plan for your IARU region. A band plan helps coordinate modes and activities; the licence determines what your station may transmit.
Further reading
- IARU and its regional organisations.
- International Telecommunication Union — international radio-frequency coordination.