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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
An LF radio clock
Low cost LF time signal crystal receiver using ferrite loop antenna.
Low cost LF time signal crystal receiver using ferrite loop antenna.
Marine sandglass MMM
Marine sandglass MMM
T-antenna
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A "T"-antenna, "T"-aerial, or flat-top antenna is a monopole radio antenna consisting of one or more horizontal wires suspended between two supporting radio masts or buildings and insulated from them
A 1935 photo of WOR / 710AM's facility in Carteret, New Jersey. In this case there are three radiators: the two towers and the center ‘T’-antenna, sus
A 1935 photo of WOR / 710AM's facility in Carteret, New Jersey. In this case there are three radiators: the two towers and the center ‘T’-antenna, suspended in the middle.
Multiwire broadcast T-antenna of early AM station WBZ, in Springfield, Massachusetts, 1925
Multiwire broadcast T-antenna of early AM station WBZ, in Springfield, Massachusetts, 1925
One of the first uses of 'T' aerials in the early 20th century was on ships, since they could be strung between masts. This is the antenna of RMS Tita
One of the first uses of 'T' aerials in the early 20th century was on ships, since they could be strung between masts. This is the antenna of RMS Titanic, which broadcast the distress call during her sinking in 1912. It was a multiwire 'T' with a 50-metre (160 ft) vertical wire and four 120-metre (400 ft) horizontal wires.
An amateur radio cage 'T'-antenna 18-metre-high (60 ft) by 27-metre-long (90 ft) built in 1922, owned by the Historic Radio Engineers Club, Riverhead,
An amateur radio cage 'T'-antenna 18-metre-high (60 ft) by 27-metre-long (90 ft) built in 1922, owned by the Historic Radio Engineers Club, Riverhead, New York. The conductor is made of a 'cage' of 6 wires held apart by wooden spreaders. This antenna achieved transatlantic contacts on 1.5 MHz, at a power of 440 W.