Bosch INT-TX04, Руководство по эксплуатации, Страница: 60 / 94

Set the delay switches
Refer to Determine the radiator delay switch positions, page 60 how to determine the radiator
delay switch positions.
!
Caution!
Turn the delay switches carefully to a new position until you feel that it clicks into position, to
prevent that a switch is positioned between two numbers, which would result in a wrong
delay setting.
Determine the radiator delay switch positions
As described in section Overlapping footprints and black spots, page 29, differences in the
delays of the signals picked up by the receiver from two or more radiators can cause black
spots as a result of the multi path effect.
The signals picked up by the receiver are delayed by:
–
the transmission from transmitter to radiator through the cable (cable signal delay)
– the transmission from radiator to receiver through the air (radiation signal delay)
– for systems with two or more transmitters: the transmission through the slave
transmitter(s)
To compensate the signal delay differences, the delay of each radiator can be increased.
These signal delays can be set with the delay switches at the back of the radiator.
The cable signal delays can be determined in the following two ways:
–
by measuring the cable lengths
– by measuring the impulse response time with a delay measurement tool
In both cases the cable signal delays can be calculated manually and with the delay switch
calculation tool (available on the documentation DVD).
It is not necessary to calculate the cable signal delay in case:
–
the radiators are directly connected to the transmitter with equal cable length;
– radiators are loop-through connected, but with less than 5 m distance between the first
and last radiator in a trunk, and with equal cable length between the first radiator in each
trunk and the transmitter.
In these cases set the delay switches on all radiators to zero and determine whether to
compensate for radiation signal delay (see section Systems with more than 4 carriers and a
radiator under a balcony, page 65).
The next sections describe how to calculate the delay switch positions manually for systems
with one transmitter, or two or more transmitters. See the delay switch calculation tool for
the procedures how to calculate the delay switch positions automatically.
Notice!
The delay switch calculation tool eases the calculation of the delay switch positions.
System with one transmitter
There are two ways to determine the delay switch positions:
–
Measuring the cable lengths
– Using a delay measuring tool
Both methods are described in the next sections.
7.3.2
7.4
7.4.1
60 en | Configuration Language Distribution System
2013.11 | V1.4 | Operation manual Bosch Security Systems B.V.