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Frequencies above 30 MHz are referred to as Very High Frequency (VHF) region and those above 300 MHz are called Ultra High Frequency (UHF).The allocated bands for amateurs are many megahertz wide, allowing for high-fidelity audio transmission modes (FM) and very fast data transmission modes that are unfeasible for the kilohertz-wide allocations in the HF bands.This may make for smoggy/foggy days but it also causes VHF/UHF radio transmissions to travel or duct along the boundaries of these warm/cold atmospheric layers.

Using relatively high power and a high gain antenna, this propagation will give marginal enhanced over-the-horizon VHF and UHF communications up to several hundred kilometers.Amateur radio frequency allocation is done by national telecommunications authorities.Globally, the International Telecommunication Union (ITU) oversees how much radio spectrum is set aside for amateur radio transmissions.While "line of sight" propagation is a primary factor for range calculation, much of the interest in the bands above HF comes from use of other propagation modes.A signal transmitted on VHF from a hand-held portable will typically travel about 5–10 km depending on terrain.With a low power home station and a simple antenna, range would be around 50 km.With a large antenna system like a long yagi, and higher power (typically 100 Watts or more) contacts of around 1000 km using the Morse code (CW) and Single Side Band (SSB) modes are common.When overhead, moon bounce and satellite relay are also possible.Some openings are caused by islands of intense ionization of the upper atmosphere known as the E Layer ionosphere.Individual amateur stations are free to use any frequency within authorized frequency ranges; authorized bands may vary by the class of the station license.Radio amateurs use a variety of transmission modes, including Morse code, radioteletype, data, and voice.


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