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refers to parts of the radio spectrum with wavelengths longer than what was originally called the medium wave broadcasting band.
It made record takings on Christmas Day, posting 5.4% like-for-like sales growth and selling 225,000 meals..A little girl's brand new unicorn toy flew away after just one go in Leicestershire.
The flying toy, which is from the film Despicable Me, was meant for indoor use only - which the family learned too late.
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Then, after the collapse of the Soviet Union, the unattended automatic lighthouses did it job for some time, but after some time they collapsed too.
The term is historic, dating from the early 20th century, when the radio spectrum was considered to consist of longwave (LW), medium wave (MW), and short wave (SW) radio bands.
Most modern radio systems and devices use wavelengths which would then have been considered 'ultra-short'.
Low frequency ground waves can be received up to 2,000 kilometres (1,200 mi) from the transmitting antenna.
Sometimes the upper limit is taken to be higher than 300 k Hz, but not above the start of the medium wave band at 520 k Hz.
in addition to the medium wave band, the term longwave usually refers specifically to this broadcasting band, which falls wholly within the low frequency band of the radio spectrum (30–300 k Hz).
Low frequency waves can also occasionally travel long distances by reflecting from the ionosphere (the actual mechanism is one of refraction), although this method, called skywave or "skip" propagation, is not as common as at higher frequencies.
Reflection occurs at the ionospheric E layer or F layers.