Mediumfrekvens
| Frekvensband | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ITU | ||||||||||||
| ||||||||||||
| EU / NATO / US ECM | ||||||||||||
| A · B · C · D · E · F · G · H · I · J · K · L · M · N | ||||||||||||
| IEEE | ||||||||||||
| HF · VHF · UHF · I · G · P · L · S · C · X · Ku · K · Ka · Q · V · W · mm | ||||||||||||
| Andra TV- och radioband | ||||||||||||
| I · II · III · IV · V · VI | ||||||||||||
Mediumfrekvens (MF; engelska: Medium frequency) är ITU-beteckningen[1] för radiofrekvenser (RF) i intervallet 300 kHz till 3 MHz. En del av detta band utgör mellanvågsbandet (MW) för AM-radio. MF-bandet är även känt som hektometerbandet eller hektometervågor, med våglängder i intervallet tio till en hektometer (1000 till 100 m). Frekvenser direkt under MF betecknas låg frekvens (LF), medan det första högre frekvensbandet är känt som hög frekvens (HF). MF används främst för AM-radio, navigationsradiofyrar och transoceanisk flygledning.
Källor
- ^ ”Rec. ITU-R V.431-7, Nomenclature of the frequency and wavelength bands used in telecommunications”. Rec. ITU-R V.431-7, Nomenclature of the frequency and wavelength bands used in telecommunications. ITU. Arkiverad från originalet den 31 October 2013. https://web.archive.org/web/20131031020427/http://www.itu.int/dms_pubrec/itu-r/rec/v/R-REC-V.431-7-200005-I%21%21PDF-E.pdf. Läst 20 februari 2013. Arkiverad 31 oktober 2013 hämtat från the Wayback Machine. ”Arkiverade kopian”. Arkiverad från originalet den 31 oktober 2013. https://web.archive.org/web/20131031020427/http://www.itu.int/dms_pubrec/itu-r/rec/v/R-REC-V.431-7-200005-I!!PDF-E.pdf. Läst 26 juni 2017.
Media som används på denna webbplats
2008-07-28 Mast radiator.jpg
Författare/Upphovsman: Ildar Sagdejev (Specious), Licens: CC BY-SA 4.0
A mast radiator antenna for an AM radio station transmitter in Chapel Hill, North Carolina. The radio frequency current from the transmitter is applied directly to the steel lattice tower, which acts as a monopole antenna element. The tower is supported at its base by a massive porcelain insulator, which insulates it from the ground. The high voltage on the tower can deliver a dangerous shock to anyone that touches it, so it is surrounded by a fence to keep people out. The white shed is called a helix house and contains an antenna tuner matching network to match the impedance of the antenna to the transmitter to allow power to be transferred efficiently to the antenna. The mast is supported by guy wires (faint), which have strain insulators in them to prevent the high voltage on the tower from being conducted to ground.
Författare/Upphovsman: Ildar Sagdejev (Specious), Licens: CC BY-SA 4.0
A mast radiator antenna for an AM radio station transmitter in Chapel Hill, North Carolina. The radio frequency current from the transmitter is applied directly to the steel lattice tower, which acts as a monopole antenna element. The tower is supported at its base by a massive porcelain insulator, which insulates it from the ground. The high voltage on the tower can deliver a dangerous shock to anyone that touches it, so it is surrounded by a fence to keep people out. The white shed is called a helix house and contains an antenna tuner matching network to match the impedance of the antenna to the transmitter to allow power to be transferred efficiently to the antenna. The mast is supported by guy wires (faint), which have strain insulators in them to prevent the high voltage on the tower from being conducted to ground.
Medium frequency.png
Författare/Upphovsman: Arkrishna, Licens: CC BY-SA 3.0
Medium Frequency : Big picture in full electromagnetic spectrum
Författare/Upphovsman: Arkrishna, Licens: CC BY-SA 3.0
Medium Frequency : Big picture in full electromagnetic spectrum