SECTION 5: DETECTING SOPHISTICATED TRANSMITTERS
REI OSC-5000E 90
d. Compare the signal strength of the frequency-hopping signal in several
locations around the building and outside using the OSCOR plotter by
repeating steps 1 through 4.
5. Compare the signal strength of each signal by overlaying the various plots and
holding them up to a light source. Using this method you can determine if the
signal is originating from within the building or from outside. If the signal is
stronger outside the building than any of the inside locations, the signal is
probably not an eavesdropping device within the building.
6. If the signal strength is stronger inside the building, localize on the room
containing the strongest signal using the plots and use a Broadband field strength
meter to find the physical location of the transmitter. For this kind of threat, a
thorough physical search is imperative.
The important thing to understand is that to have a good probability of detection, using
the previously described method, the OSCOR only needs to intercept some energy from
any one of the channels to indicate a potential threat.
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