SECTION 6: CONDUCTING A SWEEP
REI OSC-5000E 102
Investigating all hollow objects, especially if AC powered, such as lamps,
clocks, and calculators.
Taking apart all phones and fax machines (if possible) to look for any
suspicious wiring or modifications.
Opening computer, printer, and fax machine cabinets to search for suspicious
wiring or circuitry.
Checking all window drapes carefully for devices hidden in seams (use metal
detector).
Searching through all drawers in desks or filing cabinets.
Checking all baseboards for suspicious wiring or tampering. Also check along
the carpet edge.
Searching behind all hanging pictures (use metal detector).
Searching behind all bookshelves, books, and bindings (use metal detector).
Identifying and verifying all wiring associated with computers, lamps, clocks,
radios, speakers, and telephones.
Removing any unused wiring that may present an opportunity to an
eavesdropper.
Looking above all ceiling tiles and identifying all wiring in the ceiling space.
Identifying all wiring under crawl spaces.
Checking the sound transfer through heating and cooling vents. Place a sound
source directly in front of each air vent in the target area. Listen to all the air
vents within a large area to determine potential acoustic leakage (use REI’s
ALP-700 or a similar device).
Checking that all intercom speakers function properly. Intercom speakers
make great microphones. It is relatively easy to disconnect an intercom
speaker to use it for listening purposes. Unless the intercom speakers are
continuously on (even with very low sound), they should be disconnected at the
speaker or removed.
After the OSCOR has completed at least one pass through every input, each signal that
exceeds the specified squelch level will be stored in the OSCOR memory. Reliability is
increased with multiple passes through each input. By using the data recall functions
described on page 42 Data Functions (STORE/RECALL), each of these signals can be
reviewed. As each signal is reviewed, the threat level of friendly signals should be
manually changed to “Friendly”.
It is recommended that you acquire information about the expected RF signals in your
local area. In the United States, this information is available from the FCC. FCC data is
provided on the REI web site at
www.reiusa.net .
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