System With More Than 4 Carriers And A Radiator Under A Balcony; Testing The Coverage Area; Testing During Installation; Testing During A Meeting - Shure DT 6008 User Manual

DIS Digital Conference System
Note: When a master-slave configuration is used for rooms which are always separated, the delay switch
positions can be determined per system and the delay caused by transmission from master to slave
transmitter can be ignored.
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.
System with more than 4 carriers and a
radiator under a balcony
Figure 0-D illustrates a situation in which a 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 0-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.
16m
Figure 0-D Radiation path length difference for two radiators

Testing the coverage area

An extensive reception quality test must be done 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:

Testing during installation

1. Check that all radiators are connected and
powered up and that no loose cables are
connected to a radiator. Switch the transmitter
off and on to re-initialize the auto equalization
of the radiators.
2. Set the transmitter in the Test-mode (see
section 0). For each channel, a different test
tone frequency will be transmitted.
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).
4m

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 0).
2. Test all positions and directions (see next
paragraph). The quality indication should be
between 00 and 39 (good reception).

Testing all positions

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 cannot 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
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
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can be identified
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