Product Description
With GSM phones getting ever smaller, they
are increasingly being used in areas where they may compromise security.
This technology is also becoming the preferred medium for bugs and
other surveillance devices.
To combat these problems, PDA Electronics has developed the GSM185 mobile phone
detector. On detecting activity from a GSM-based transceiver, it alerts the user
by flashing LEDs. A cadenced vibrator is built in for covert use.
The 5-bar LED display shows the strongest signal detected and helps to guide
the operator to its source. This eases searching where several signals may be
present.
The GSM185 is especially suitable:
• for use by security personnel in Government establishments, military bases,
and prisons;
• in commercial applications such as banking, dealing rooms, and design offices;
• for security companies who need to sweep premises for concealed surveillance
devices.
Features
Sensitivity and detection ranges
You can set the GSM185's sensitivity to match the area to be scanned to help
detect GSM phones or surveillance units not only in variously sized rooms or
buildings but also over much larger areas – at up to 200
m. Internal switches
allow selection of the operating mode. While searching, you can select one of
three sweeping sensitivities using the single control button. (See the tables
opposite.)
Display
The presence and strength of detected GSM phone signals are indicated by
the rapid flashing of one of the 5 LEDs on the bargraph display. Analogue, RF
signals, or high concentrations of digital signals are indicated by a steady
column of LEDs. The higher the signal strength, the more LEDs are illuminated.
While the GSM185 is operating but there are no alarms, one of three LEDs will
flash slowly to indicate the current sensitivity setting. Use the button to step
from range to range until the desired setting is shown.
Using the GSM185
The high sensitivity Scan mode allows detection of an active mobile phone at
up to 200 metres (GSM900: Network signals). In this mode, RF signals from two
way radios, base stations, and even RF CCTV systems can be detected if desired:
they may impair the unit's GSM performance. The Search modes, used to complement
the high range, resolve signals from 1 metre to 45 metres away, with background
RF detection inhibited. The Meeting Minder modes are designed for scanning or
monitoring rooms for active GSM equipment. They detect calls alone at short ranges:
participants in meetings can thus be warned by a discreet vibration in the pocket.
Other (Network) traffic is still indicated on the display but does not activate
the vibrator, and RF detection is inhibited. |
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Specifications Frequency
bands
EGSM900 & GSM1800 ( Europe ), GSM850 & GSM1900
( USA & Canada ) Sensitivity settings and
location resolution
| Sensitivity |
Switch 2 |
Max Range |
Resolution |
Mode |
| High |
don't care |
200 metres |
20 metres |
Scan |
| Medium |
OFF |
45 metres |
4.5 metres |
Search |
| Medium |
ON |
30 metres |
3.5 metres |
Meeting Minder |
| Low |
OFF |
15 metres |
1.5 metres |
Search |
| Low |
ON |
10 metres |
1.0 metres |
Meeting Minder |
Note: all ranges are quoted for GSM900 Network transmissions.
Detection
method
Pulse Envelope Demodulation with our unique Digital Signal
Processing algorithms help to prevent false alarms while
differentiating between strong, weak, and interfering signals.
LED
indications The 5-segment bargraph flags
an alarm and the approximate range to its source.
The segments are colour coded for easy use in low light areas.
The
blue, orange, and red LEDs are also used as sensitivity
indicators : when the GSM185 is on, one will flash
slowly in the absence of an alarm.
A single fast-flashing
LED on the bargraph indicates the received strength of
a detected GSM signal, blue being strongest and red weakest.
The
bargraph is also used to display interfering or background RF
levels as a steady column of lights. This can be
displayed simultaneously with the GSM mobile phone activity
and produces no vibration alert: it is advisory.
On
/ Reset button
• While
the unit is turned off, a single press will turn it
on .
• To
change the range setting at any time, press and
hold the button down for at least a second. First the
current “ sensitivity ” LED
will flash, then the next in sequence, and so on. Release
the button to select the range which is being indicated.
Repeat as required.
• If the vibrator has
been activated, it can be temporarily silenced by a single
press. The next alarm will automatically re-enable it.
• To
turn the unit off , press and hold the switch.
The GSM185 will cycle through its range-setting sequence;
if this returns to its beginning while the switch is
still being held down, the device will switch off.
Internal
switches
DIP
switches on the circuit board allow the user to select
the following:
| Switch
1 |
Function |
| ON |
Enable RF
detection (on high range mode only) |
| OFF |
Disable
RF detection |
| Switch
2 |
Function |
| ON |
Enable Meeting
Minder mode |
| OFF |
Enable scan
or search modes |
Battery life
Typically
50 hours' operation, allowing for average
use of the vibrator. The GSM185 automatically
powers off after 12 hours. The Low battery LED indicates
that the the cells should be replaced.
Physical
Case
85 x 46 x 16mm (length x width x depth).
ABS to UL 94-HB.
Weight 59 grams (including
batteries)
Battery 2 x alkaline ‘N' cells |
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