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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.
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.
A portable battery-powered AM/FM broadcast receiver, used to listen to audio broadcast by local radio stations. A modern communications receiver, used in two-way radio communication stations to talk with remote locations by shortwave radio. Girl listening to vacuum tube console radio in the 1940s.
FM transmitters have been used to construct miniature wireless microphones for espionage and surveillance purposes (covert listening devices or so-called "bugs"); the advantage to using the FM broadcast band for such operations is that the receiving equipment would not be considered particularly suspect. Common practice is to tune the bug's ...
Other methods that have been used in North America to intrude on legal broadcasts include using a directional antenna to overpower the uplink frequency of a broadcast relay station, breaking into the transmitter area and splicing audio directly into the feed, and cyberattacks on internet-connected broadcasting equipment. [1]
Antenna reactance may be removed using lumped elements, such as capacitors or inductors in the main path of current traversing the antenna, often near the feedpoint, or by incorporating capacitive or inductive structures into the conducting body of the antenna to cancel the feedpoint reactance – such as open-ended "spoke" radial wires, or ...
In South Africa, the use of wireless signal jammers is illegal. There is a single exception to this rule. South Africa's State Security Cluster may, in certain instances, employ signal jammers. [38] In Singapore, a local Indonesian Batam Hang FM 106.0 MHz based Islamic radio station of Indonesia radio stations has been jammed.
A wireless microphone or sound system using diversity reception will switch to the other antenna within microseconds if one antenna experiences noise, providing an improved quality signal with fewer drop-outs and noise. Ideally, no drop-outs or noise will occur in the received signal.
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