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Gemini 7502 Manual

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DESCRIPTION OF HYPERFREQUENCY MODULE.
GEMINI 7059.
The 7059 sensor protects the car by detecting intrusions into the passenger compartment through the
emission of a hyperfrequency electromagnetic field (f = 2.45 Ghz).
The sensor operates according to the principle of reflection of high-frequency electromagnetic waves by
means of conductors (metals, human bodies, etc.).
The measurement of these reflections makes it possible to detect extraneous objects moving within the
electromagnetic field and generate an alarm signal.
The intrinsic characteristics of the 7059 sensor make it immune to air movement (e.g.: wind, turbulence,
thermal variations, etc.), and therefore it is particularly suitable to be installed on convertibles, pickups or
cars with sunroofs.
Since non-conductors or insulators (plastics, fabrics, etc.) are permeable to electromagnetic waves, the
7059 sensor can be installed under the upholstery of the passenger compartment thus completely hiding it
from view.
INSTRUCTIONS FOR INSTALLATION
For the 7059 sensor to function properly it is of utmost importance to carefully identify the installation
position, which will vary depending on the type of car.
In this regard it should be pointed out that, generally speaking, hyperfrequency sensors do not provide
total protection of the passenger department, the reason being that the sensitivity must be regulated to
avoid creating false alarms caused by the electromagnetic field going outside the car windows.
To prevent false alarm conditions, do not install the sensor under the glove compartment or coin tray.
Moreover, the car should not have swinging metal objects inside.
The 7059 sensor can be installed under the upholstery of the rear seat base (facing the front of the car),
behind the dashboard in a central position, under the upholstery of the central tunnel or near the courtesy
lights on the ceiling (under the upholstery of the car roof interior).
ELECTRICAL CONNECTIONS
The connection is very simple because the wiring harness of the alarm system has a dedicated connector
for the sensor.
SENSITIVITY ADJUSTMENT
The 7059 module has a TRIMMER for adjusting sensitivity from a minimum value (not ZERO) to a
maximum value. Calibration is facilitated by the presence of a red LED emitting a continuous light for 4
seconds every time there is an interference in the module’s protection radius. (NOTE: between one alarm
signal and the next, at least four seconds must pass after the LED turns off).
Procedure for adjusting sensitivity:
1. Adjust the TRIMMER to the maximum sensitivity position (all the way clockwise).
2. Connect the alarm and wait for the end of the neutral connection time, with the doors, bonnet, boots
and windows closed.
3. Move your hands near the car windows (lateral windows, windscreen and rear window) and make sure
the 7059 sensor does not detect any alarm conditions.
4. If alarm conditions occur, reduce the sensitivity of the sensor by turning the adjustment TRIMMER
counterclockwise. Then repeat the test as indicated under 3).
5. If the sensor does not intervene, disconnect the alarm and lower one of the front windows.
6. Connect the alarm again and simulate an attempted theft by sticking your arm in through the window
and moving it in proximity of the front seats to provoke the alarm intervention.
TECHNICAL DATA AND CHARACTERISTICS - 7059
Working temperature –40°C to +85°C.
Duration of alarm signal 4 sec with a pause of 4 sec between
every alarm signal.
Working voltage 9V to 15V.
Electrical input
≤ 5mA.
EM frequency field
2.45 GHz ± 2.5MHz.
… 8 …


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