System With More Than 4 Carriers; And A Radiator Under A Balcony; Testing The Coverage Area; Testing During Installation - Danish Interpretation Systems DCS 6000 User Manual

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3.5.3 System with more than 4
carriers and a radiator under a
Figure 3.5-D illustrates a situation in which a
balcony
radiation signal delay occurs and which can be
compensated for. For systems with more than
four carriers, add one delay switch position per
10 meter (33 feet) difference in signal path
length to the radiators which are closest to the
overlapping coverage area. In Figure 3.5-D the
signal path length difference is 12 meter. Add
one delay switch position to the calculated
switch position(s) for the radiator(s) under the
balcony.
Figure 3.5-D Radiation path length difference for two radiators
An extensive reception quality test must be done
3.6

Testing the coverage area

to make sure that the whole area is covered with
IR radiation of adequate strength and that there
are no black spots. Such a test can be done in two
ways:
1. Check that all radiators are connected and
3.6.1

Testing during installation

powered up and that no loose cables are
connected to a
transmitter off and on to re-initialise the
auto equalisation of the radiators.
2. Set the transmitter in the Test-mode (see
section 4.5.7). For each channel, a different
test tone frequency will be transmitted.
20
radiator. Switch the
User Manual DCS 6000 Digital IR System rev H.docx
3. Set a receiver on the highest available
channel and listen via the headphones to the
transmitted test tone.
4. Test all positions and directions (see next
paragraph).
1. Set a receiver in the Test-mode and select
3.6.2

Testing during a meeting

the highest available carrier. The quality of
the received carrier signal is indicated on the
display of the receiver (see section 6.3).
2. Test all positions and directions (see next
paragraph). The quality indication should be
between 00 and 39 (good reception).
With the transmitter and receiver in one of the
3.6.3

Testing all positions

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:
The receiver cannot pick-up infra-red radiation
3.6.4

Bad coverage

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
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.
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to half power