Guaranteed rectangular footprints can also be calculated with the footprint calculation tool
(available on the documentation DVD). The given values are for one radiator only, and
therefore do not take into consideration the beneficial effects of overlapping footprints. The
beneficial effects of reflections are also not included. As rule of thumb can be given for
systems with up to 4 carriers that if the receiver can pick up the signal of two adjacent
radiators, the distance between these radiators can be increased by a factor 1.4
approximately (see the next figure).
Figure 4.21: The effect of overlapping footprints
Plan radiators
Use the following procedure to plan the radiators:
1. Follow the recommendations in section Aspects of Infrared distribution systems, page 23 in
order to determine the positioning of the radiators.
2. Look up (in the table) or calculate (with the footprint calculation tool) the applicable
rectangular footprints.
3. Draw the rectangular footprints in the lay-out of the room.
4. If the receiver can pick up the signal of two adjacent radiators in some areas, determine
the overlap effect and draw the footprint enlargement(s) in the lay-out of the room.
5. Check whether you have sufficient coverage with the radiators at the intended positions.
6. If not so, add additional radiators to the room.
See the figures 4.14, 4.15 and 4.16 for examples of a radiator lay out.
4.3.2
Language Distribution System Planning | en 31
Bosch Security Systems B.V. Operation manual 2013.11 | V1.4 |
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