BASIC CPM-700 RF PROCEDURE
REI
CPM-700
16
RF CONSIDERATIONS
The CPM-700, with the Standard RF Probe, detects and locates audio or
video surveillance transmitters (bugs) broadcasting from 50 kHz to 3 GHz.
The BMP-1200, included in the CPM-Deluxe, extends the CPM’s frequency
range to 12 GHz.
The CPM’s bar graph shows the effects of RF field intensity as you
approach a transmitting device, and the received audio can help you to
discern between a friendly local source of RF and an actual bug. The CPM-
700 will display an increasing level on the bar graph as you approach a
stronger RF level.
The detection range depends on two major factors: 1) The bug’s output
power, antenna efficiency, and pattern; and 2) The surrounding RF
environment such as commercial radio/TV and two-way radio transmission.
Other, minor factors are the frequency of the transmission and probe
antenna’s length in the case of the Standard RF Probe.
To find the location of a hidden surveillance transmitter, find the area of the
room that produces the highest level on the bar graph. A “walk around
sweep” will locate the area of a room that is “HOT” with RF energy.
PERFORMING A “WALK AROUND ROOM SWEEP”
1.
With the headphones on, holding the
RF Probe by the foam grip, position
the probe vertically while holding it out
in front of your body. (See page 22 for
information on using the Broadband
Microwave Probe (BMP-1200)).
2.
Enter the target area while noting the
average bar graph Level. If the bar
graph displays “MAX”, use Low Gain.
If the bar graph still displays “MAX” on
Low Gain, shorten the probe antenna.
(See page 22 for information on using the Broadband Microwave
Probe (BMP-1200)).