what is vhf mf and hf?
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Digital selective calling or DSC is a standard for transmitting pre-defined digital messages via the medium-frequency (MF), high-frequency (HF) and very-high-frequency (VHF) maritime radio systems. It is a core part of the Global Maritime Distress Safety System (GMDSS).
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UHF radios broadcast at between 300 MHz and 3 GHz. VHF radio signals tend to degrade more than UHF signals indoors. UHF radios also have shorter antennas than VHF radios, making them a better fit for discreet radio devices or in situations where longer antennas are impractical, such as crowded hallways in schools.
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Hydrofluoric acid is a solution of hydrogen fluoride (HF) in water and is a precursor to almost all fluorine compounds. It is a colorless solution that is highly corrosive, capable of dissolving many materials, especially oxide and its ability to dissolve glass has been known since the 17th century.
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RG-213/U is a very flexible, low loss coaxial cable which is commonly terminated with N Connector or UHF connector for general HF and VHF use. ... RG213 Typically lower loss than RG58, slightly heavier and allows 5,000 volts difference between the center conductor and the shield, compared to 4,000 for RG8.
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A high-pass filter (HPF) attenuates content below a cutoff frequency, allowing higher frequencies to pass through the filter. A low-pass filter (LPF) attenuates content above a cutoff frequency, allowing lower frequencies to pass through the filter.
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Virtually all pro wireless systems operate on either the VHF (very high frequency) or UHF (ultra high frequency) bands. ... UHF also has more range than VHF, not because of power, but because the signals move through the atmosphere more easily. UHF also has up to eight times more frequencies available.
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The technical explanation: HFC is short for Hybrid Fibre Coaxial, and is typically used to connect properties to the NBN where an existing pay TV (Foxtel) or cable network (Telstra or Optus) is available.
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Asseration: Liquid `HF` is used as non-aqueous solvent and many acid-base reactions occur in this solvent system. Reason: Liquid `HF` undergoes self ionisation.
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A millifarad (mF) is a decimal fraction of a farad, the SI derived unit of capacitance. A capacitor of one farad produces a potential difference of one volt between its plates when it stores an electric charge of one coulomb. Millifarad is rarely used in electronics and electrical engineering.
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Throughout the world, the FM broadcast band falls within the VHF part of the radio spectrum. Usually 87.5 to 108.0 MHz is used, or some portion thereof, with few exceptions: In the former Soviet republics, and some former Eastern Bloc countries, the older 65.8–74 MHz band is also used.
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VHF radio refers to a marine radio transmitting on frequencies 156.025 to 163.275 MHz with 25 watts RF output. MF/HF (medium/high frequency) and SSB (single side band) radios are mostly used for offshore cruising and require a ship's licence to operate.
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The standard method of communication between an air traffic controller and a pilot is voice radio, using either VHF bands for line-of-sight communication or HF bands for long-distance communication (such as that provided by Shanwick Oceanic Control).
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A VHF set is recommended over 27MHz, as 27Mhz is highly susceptible to static and has significantly reduced radio coverage compared to VHF.
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1). A high-pass filter (HPF) attenuates content below a cutoff frequency, allowing higher frequencies to pass through the filter. A low-pass filter (LPF) attenuates content above a cutoff frequency, allowing lower frequencies to pass through the filter.
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Ham radio is limited to certain specific frequencies (bands). Shortwave includes all the ham frequencies (below VHF and UHF) and all the frequencies in between. ... Shortwave is similar to a radio station, in that it is broadcast only. Ham radio is two-way communications, meaning a station can both transmit and receive.
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It is not possible to match UHF and VHF frequencies, because UHF radios only communicate in UHF 430-470 MHZ range and VHF radios communicate in VHF 150-174 MHZ range.
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Unfortunately it's not possible to convert VHF to UHF etc, as each type of radio contains hardware that enable it to operate on a specific frequency range. If you're buying or hiring more radios to work alongside ones you already use, they need to be of the same type.