9
Antenna:
The flexible stainless ANTENNA allows for the UHF propagation of the RF signal. The
ANTENNA must be oriented in a vertical direction for best RF propagation and for proper
alignment of the infrared beams.
Lens:
The IR-903’s focal length is preset to detect a person at an optimum distance of 30 feet, although
it will work satisfactorily over a range of 5 to 50 feet. Its field of view is about 10 feet wide at a
distance of 50 feet. The LENS is aimed in the direction of your target area.
The IR-900B is a long-range version of the IR-903 and utilizes an external battery pack. Its focal
length is preset to detect a person at an optimum distance of 100 feet, although it will work
satisfactorily over a range from 20 to 200 feet. The field of view at 100 feet is about 5 feet wide,
allowing for very precise control over the sensing region.
SENSOR RANGE TEST MODE:
Range Test Mode:
Sensor Range Test Mode is used to verify the maximum RF transmission distance from the IR-
903 Sensor to the Receiver/Processor. The IR-903 Sensor range test may be monitored by
several methods. One method is to simply program the frequency (916.5 MHz, AM mode) of the
IR-903 Sensor into a scanner. Another method would be to use another Intellicam device with a
Receiver/Processor such as the WTM-3A Walk Test Module. The WTM-3A is an optional device
and must be purchased separately, but has the advantage of mobility and small size. The other
option is to use any Intellicam System II receiver, the unit can either be carried while range
testing or can be placed near the target area on the ground, in which case the operator can
observe the RED LED on the receiver processor module. There is nothing the operator has to do
to the Receiver/Processor except apply power from the battery pack.
Screw the TC-1 Sensor Tree Clip into the tree, about 3 to 4 feet above the ground level and
install the sensor. It is best to locate the Receiver on the same side of the tree as the Sensor so
that the tree will not block the RF signal. The best range is achieved with line-of-sight conditions,
that is, with no obstructions coming between the Sensor and Receiver/Processor. Position the
IR-903 Sensor in the tree mount with the antenna vertical. Aim the Sensor at the target area. To
activate the IR-903, remove the plastic insulator from the batteries. As soon as power is applied,
the BLUE LED should come on and go off. After about a 30 second stabilization period, the
Sensor will automatically go into the Range Test mode.
Trip the Sensor by slowly waving your hand in front of the lens. When the Sensor trips, it will start
transmitting at 1 second intervals and with the Sensor BLUE LED flashing. Walk away from the
Sensor with the Receiver/Processor in your hand. The maximum range will be found when the
RED LED on the Receiver/Processor stops flashing or becomes erratic. You should cut this
distance in half for a more reliable setup, since RF/UHF frequencies cannot be predicted with any
great certainty due to absorption and reflections from nearby objects. The Range Test should
involve hanging the Receiver/Processor antenna in a suitable bush or tree, with appropriate
camouflage, and standing back from it. If the RED LED flashes on the Receiver/Processor
become erratic then you know that you are exceeding the maximum RF transmission distance.
