Low frequency
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Low frequency is the ITU designation for radio frequencies in the range of 30–300 kHz. Since its wavelengths range from 10–1 km, respectively, it is also known as the kilometre band or kilometre waves
An LF radio clock
Low cost LF time signal crystal receiver using ferrite loop antenna.
Marine sandglass MMM
Non-directional beacon
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A non-directional beacon or non-directional radio beacon is a radio beacon which does not include inherent directional information. Radio beacons are radio transmitters at a known location, used as an
Radio tower of NKR Leimen-Ochsenbach, Germany
NDB transmitter at 49°12′21″N 002°13′12″W / 49.20583°N 2.22000°W / 49.20583; -2.22000 (Jersey West) Callsign JW – 'Jersey West'. 329.0 kHz.
One of the wooden poles of NDB HDL at Plankstadt, Germany
Ferrite antenna for non-directional beacon (NDB), frequency range 255–526.5 kHz