Μετάφραση και ανάλυση λέξεων από τεχνητή νοημοσύνη
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- πώς χρησιμοποιείται η λέξη
- συχνότητα χρήσης
- χρησιμοποιείται πιο συχνά στον προφορικό ή γραπτό λόγο
- επιλογές μετάφρασης λέξεων
- παραδείγματα χρήσης (πολλές φράσεις με μετάφραση)
- ετυμολογία
high frequency amplification - translation to ελληνικό
![A typical [[Yagi antenna]] used by a Canadian radio amateur for long distance communication](https://commons.wikimedia.org/wiki/Special:FilePath/Montreal-tower-top.thumb2-crop.jpg?width=200 "A typical [[Yagi antenna]] used by a Canadian radio amateur for long distance communication")
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![A CableFree MMW link installed in the UAE installed for [[Safe City]] applications, providing 1Gbit/s capacity between sites. The links are fast to deploy and have a lower cost than fibre optics.](https://commons.wikimedia.org/wiki/Special:FilePath/CableFree MMW Link installed in UAE.jpg?width=200 "A CableFree MMW link installed in the UAE installed for [[Safe City]] applications, providing 1Gbit/s capacity between sites. The links are fast to deploy and have a lower cost than fibre optics.")
![Atmospheric attenuation in dB/km as a function of frequency over the EHF band. Peaks in absorption at specific frequencies are a problem, due to atmosphere constituents such as [[water]] vapour (H<sub>2</sub>O) and molecular [[oxygen]] (O<sub>2</sub>). The vertical scale is logarithmic.](https://commons.wikimedia.org/wiki/Special:FilePath/Micrwavattrp.png?width=200 "Atmospheric attenuation in dB/km as a function of frequency over the EHF band. Peaks in absorption at specific frequencies are a problem, due to atmosphere constituents such as [[water]] vapour (H<sub>2</sub>O) and molecular [[oxygen]] (O<sub>2</sub>). The vertical scale is logarithmic.")
![Soviet aircraft carrier ''Minsk'']]](https://commons.wikimedia.org/wiki/Special:FilePath/Minsk port bow AK-630 CIWS gun fire control radar.JPG?width=200 "Soviet aircraft carrier ''Minsk'']]")
![Part of the [[Atacama Large Millimeter Array]] (ALMA), a millimeter wave [[radio telescope]]](https://commons.wikimedia.org/wiki/Special:FilePath/The Atacama Compact Array.jpg?width=200 "Part of the [[Atacama Large Millimeter Array]] (ALMA), a millimeter wave [[radio telescope]]")
Ορισμός
Βικιπαίδεια
High frequency (HF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters (ten to one hundred meters). Frequencies immediately below HF are denoted medium frequency (MF), while the next band of higher frequencies is known as the very high frequency (VHF) band. The HF band is a major part of the shortwave band of frequencies, so communication at these frequencies is often called shortwave radio. Because radio waves in this band can be reflected back to Earth by the ionosphere layer in the atmosphere – a method known as "skip" or "skywave" propagation – these frequencies are suitable for long-distance communication across intercontinental distances and for mountainous terrains which prevent line-of-sight communications. The band is used by international shortwave broadcasting stations (3.95–25.82 MHz), aviation communication, government time stations, weather stations, amateur radio and citizens band services, among other uses.
