RF DETECTORS AND BUG DETECTORS
Over the years many of these devices have been openly sold to the general
public by a number of firms, with one firm alone boasting of the many "thousands of
satisfied customers" it has served.
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The most common Eavesdropping Transmitters (telephone and room type) were originally
designed to be operated in or near the standard FM broadcast band of 88 - 108MHz.
However, in order to lessen the possibility of inadvertent discovery, current eavesdroppers
now use frequencies that are either above or below the standard band.
A number of commercially available transmitters will adjust their transmitting frequency just
off each end of the standard band so that frequencies between 78 - 88MHz and
108 - 118MHz may also be used. On the high end, the transmitters broadcast directly on
many aircraft frequencies. On the low end they may be picked up on standard television
receivers. A large number were made to operate in the 150 - 475MHz area.
And, the latest Eavesdropping Transmitters now utilize the higher frequencies above 3 GHz.
These extremely high frequencies provide considerably less chance of detection during
Counter Surveillance "sweeps" that are performed with outdated low frequency equipment.
To conserve battery power, some transmitters are voice activated and start transmitting
automatically when sounds or conversations begin and turn off when sounds cease.
Many Telephone Transmitters start when the telephone is picked up and turn off when
the telephone is hung up. Of course, any conversation that can be monitored can also
be recorded. The recording may be done manually or automatically through the use
of "carrier switches" that start and stop the recorder whenever the eavesdropping
transmitter turns on and off. The receiver-recorder may be placed in the trunk of an auto
located a considerable distance from the actual site being monitored.