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A covert listening device, more commonly known as a bug or a wire, is usually a combination of a miniature radio transmitter with a microphone. The use of bugs, called bugging, or wiretapping is a common technique in surveillance , espionage and police investigations.
The first radio transmitters could not transmit audio (sound) like modern AM and FM transmitters, and instead transmitted information by radiotelegraphy; the transmitter was turned on and off rapidly using a switch called a telegraph key, creating different length pulses of radio waves ("dots" and "dashes") which spelled out text messages in Morse code.
In the following there are lists of sites of notable radio transmitters.During the early history of radio many countries had only a few high power radio stations, operated either by the government or large corporations, which broadcast to the population or to other countries.
A personal FM transmitter is a low-power FM radio transmitter that broadcasts a signal from a portable audio device (such as an MP3 player or a smartphone) to a standard FM radio. Most of these transmitters plug into the device's headphone jack and then broadcast the signal over an FM broadcast band frequency, so that it can be picked up by any ...
Taoglas, headquartered in Dublin, Ireland, is a manufacturer of RF antennas, RF Receivers, speakers and other modules. [1] [2] The company was founded in 2004 in Enniscorthy, County Wexford and in 2021, with their main headquarters located in Dublin. [3] In February 2023, the company was purchased by US based Graham Partners. [4]
The Thing, also known as the Great Seal bug, was one of the first covert listening devices (or "bugs") to use passive techniques to transmit an audio signal. It was concealed inside a gift given by the Soviet Union to W. Averell Harriman , the United States Ambassador to the Soviet Union , on August 4, 1945.
Today the Irish digital television service Saorview, and five national radio stations on FM, are broadcast from the Holywell Hill site to a large area of North West Ireland including Derry city. [3] The transmitter also services a number of relay transmitters in County Donegal to help improve coverage in the difficult terrain.
Long wire antenna on grounded steel tube mast NDR Info Banovići: 2 Radio Banovići Kempston 0.275 Closed 2 November 2020 Smooth Radio 801 München-Ismaning: 100 Guyed steel tube mast, height 171.5 m, insulated against ground, multiple feedable. Spare antenna: guyed mast of lattice steel, height 105 m, insulated against ground Bayern Plus
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