Technical data

64 en | Configuration Integrus
IOM-INT | V1.1 | 2010.12 Installation and Operation manual Bosch Security Systems B.V.
4. Test all positions and directions (see next paragraph).
Testing during a meeting
1. Set a receiver in the Test-mode and select the highest available carrier. The quality of the
received carrier signal is indicated on the display of the receiver (see section 9.3.2 ).
2. Test all positions and directions (see next paragraph). The quality indication should be
between 00 and 39 (good reception).
Testing all positions and directions
With the transmitter and receiver in one of the two test modes, go around the conference hall
and test the reception quality at every position where the infra-red signals must be received.
When an area is detected where there is bad reception or even no reception at all, three main
causes must be considered:
Bad coverage
The receiver can not pick-up infra-red radiation of adequate strength. This can be because the
tested position is outside the footprint of the installed radiators or the radiation is blocked by
obstacles such as a column, an overhanging balcony or other large objects.
Check that you used the correct footprints for the system design, that radiators with enough
output power are installed and that a radiator is not accidentally switched to half power
operation. When the bad reception is caused by a blocked radiation path, try to remove the
blocking obstacle or add an extra radiator to cover the shaded area.
Black spots
The receiver picks-up IR signals from two radiators which cancel out each other. The
multipath effect can be identified by the observation that the bad reception only occurs along
a specific line and/or when good reception returns when the receiver is rotated to another
direction. This can be confirmed by keeping the receiver in the position and direction with the
bad reception and then either shading-off the radiation from one radiator with your hand or
switching off one radiator. If this improves the reception quality, then the multipath effect is
causing the problem. Note that IR radiation that is reflected from a surface with a high
reflectively can also cause multipath problems.
Black spots can occur in case a transmitter is located in the same room as the radiators. In
that case, disable the mini IR radiator of the transmitter with the configuration menu (see
section 7.2.11 ).
Check that the signal delay compensation switches on the radiators are set to the correct
value and that a switch is not accidentally positioned between two numbers. Re-check your
system design. When necessary, reduce the distance between the two radiators that cause
the problem and/or add an extra radiator.
Note that due to the physical characteristics of the signal distribution, it is not always
possible to completely avoid multi path effects.
Interference from IR systems
IR assisted hearing systems and IR microphones operating at frequencies above 2 MHz, can
disturb the reception at the lowest carriers. If such is the case, disable the lowest two carriers
(see section 7.2.7 ) and re-check the reception.