OTHER PROCEDURES AND EQUIPMENT
REI
CPM-700
38
Microwave Link
Point-to-point surveillance transmission by microwave is not common due
to difficulty of installation and alignment. However, in some cases this
disadvantage is outweighed by the advantages: it is reliable, directional
and can support many channels of information, including video.
Microwave transmission is harder to detect because of its directional beam.
The sweep operator must get the CPM Probe in the beam to detect it. A
physical search is necessary to uncover either the microphone or camera,
or transmitter. The transmitter element usually will be outside the building
or beaming through a window. Microwaves do not penetrate structures very
well. Inspect the roof and outside walls for any new or unusual “black
boxes” that may be hiding an antenna. When probing with the CPM-700,
shorten the RF Probe antenna to minimize extraneous signals. The RF Probe
is able to receive up to 3 GHz. For higher frequencies (3 to 12 GHz), use
the BMP-1200 from REI.
Tape/Digital Recorders
Tape recorders are commonly associated with eavesdropping. The major
disadvantages are the short time available for recording (even with an
extended play recorder, someone must change the tape daily), delayed
reception of recorded information, relatively large size, and high current
consumption. Digital recorders do not transmit RF energy, nor do they have
magnetic bias oscillators, and so may only be detected by a non-linear
junction detector (REI’s Orion). However, some digital recorders may emit
magnetic leakage (i.e. through the LCD display) and can sometimes be
detected using the Magnetic Leakage Probe at close range.
Acoustic Leakage
Often, security personnel get so involved looking for high tech surveillance
devices that they overlook very basic sources of “leaks,” as simple as an
individual placing his ear on the outside wall of an office. Sound can be
transmitted outside the room by vibrations through windows, walls,
plumbing, ductwork, etc. and picked up by microphones or laser devices
outside the target area.
The ALP-700, used with the CPM, can detect where a target area is most
vulnerable to acoustic eavesdropping. Other REI products can also be used
to defeat acoustic eavesdropping, including the ANG-2200 system, the
ALL-900 with a laptop computer, and the ALA-900 coupled with the CMA-
100. Contact REI for more information, or visit
www.reiusa.net
.