Objects, Surfaces And Reflections; Positioning The Radiators - Shure DT 6008 User Manual

DIS Digital Conference System
When high levels
incandescent or halogen lamps, such as spotlights
or stage lighting are applied, you should directly
point a radiator at the receivers in order to ensure
reliable transmission. For venues containing large,
unscreened windows, you must plan on using
additional radiators.
For events taking place in the open air a site test
will be required in order to determine the required
amount of radiators. With sufficient radiators
installed, the receivers will work without errors,
even in bright sunlight.

Objects, surfaces and reflections

The presence of objects in a conference venue can
influence the distribution of infra-red light. The
texture and colour of the objects, walls and ceilings
also plays an important role.
Infra-red radiation is reflected from almost all
surfaces. As is the case with visible light, smooth,
bright or shiny surfaces reflect well. Dark or rough
surfaces absorb large proportions of the infra-red
signal (see Figure 0-F). With few exceptions it
cannot pass through materials that are opaque to
visible light.
100% 40%
Figure 0-F The texture of the material determines how much light is
reflected and how much is absorbed
Problems caused by shadows from walls or furniture
can be solved by ensuring that there are sufficient
radiators and that they are well positioned, so that
a strong enough infra-red field is produced over the
whole conference area. Care should be taken not to
direct radiators towards uncovered windows, as
most of this radiation will subsequently be lost.

Positioning the radiators

Since infra-red radiation can reach a receiver
directly and/or via
important to take
considering the positioning of the radiators. Though
it is best if receivers pick up direct path infra-red
radiation, reflections improve the signal reception
and should therefore not be minimized. Radiators
should be positioned high enough not to be blocked
by people in the hall (see Figure 0-G and Figure
0-H).
of artificial lighting
100% 80%
diffused reflections,
this into account
with
Figure 0-G
Figure 0-H
The figures
radiation
participants. In Figure 0-I, the participant is
situated clear from obstacles and walls, so a
combination of direct and diffused radiation can
be received. Figure 0-J shows the signal being
reflected from a number of surfaces to the
participant.
it is
when
Figure 0-I
9
Infra-red signal blocked by a person in front of the
participant
Infra-red signal not blocked by a person in front of the
participant
below illustrate
can be directed
Combination of direct and reflected radiation
User Manual
how infra-red
to conference