Bosch Integrus Operation Manual page 68

68 en | Testing
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 black spot 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 black spot is
causing the problem. Note that IR radiation that is reflected from a surface with a high
reflectively can also cause black spots.
Black spots can occur in case a transmitter is located in the same room as the radiators.
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Note that due to the physical characteristics of the signal distribution, it is not always possible
to completely avoid black spots.
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 Disable or enable carriers (4G), page 56) and re-check the reception.
2013.11 | V1.4 |
In that case, disable the mini IR radiator of the transmitter with the configuration menu
(see section Enable / disable IR-monitoring (4M), page 58).
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.
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