VHF

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Definition

Noun: 1. Very High Frequency: A range of radio frequencies from 30 to 300 megahertz. This band is commonly used for FM radio broadcasting, television audio, two-way land mobile radio systems, and maritime communications. 2. Viral Hemorrhagic Fever: A group of severe, often fatal illnesses caused by several distinct families of viruses. These illnesses are characterized by fever, fatigue, muscle pain, and, as the name suggests, damage to the body's vascular system which can lead to internal and external bleeding (hemorrhage). These diseases are often, but not exclusively, found in specific geographic areas.

Usage Examples
  • Very High Frequency (VHF):
    • The coast guard station broadcasts marine weather alerts on a dedicated VHF channel.
    • Older analog television signals were transmitted in both the VHF and UHF bands.
  • Viral Hemorrhagic Fever (VHF):
    • Ebola virus disease is one of the most well-known and deadly viral hemorrhagic fevers.
    • Outbreaks of certain VHFs require strict isolation protocols to prevent transmission.
Advanced Usage
  • VHF is primarily used as an initialism (where each letter is pronounced) rather than an acronym (pronounced as a word). It is often used attributively as a noun modifier.
    • VHF radio | VHF antenna | VHF band
  • In medical contexts, VHF is a broad categorical term. Specific diseases are referred to by their names (e.g., Lassa fever, Marburg virus disease, Crimean-Congo hemorrhagic fever).
Variants and Related Words
  • UHF (Ultra High Frequency): The adjacent, higher frequency radio band (300 MHz to 3 GHz).
  • HF (High Frequency): The adjacent, lower frequency radio band (3 MHz to 30 MHz).
  • Hemorrhagic Fever: A more general, non-initialism term synonymous with the medical definition of VHF.
Synonyms
  • For Very High Frequency: Band II (in radio contexts).
  • For Viral Hemorrhagic Fever: Hemorrhagic fever (general term).
Notes on Different Meanings

The two meanings of VHF belong to completely different domains: telecommunications/electronics and medicine/virology. The intended meaning is always clear from the context. The telecommunications meaning is far more common in everyday technical language.

Noun
  1. 30 to 300 megahertz
  2. a group of illnesses caused by a viral infection (usually restricted to a specific geographic area); fever and gastrointestinal symptoms are followed by capillary hemorrhage

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