Planning An Dcs 6000 Digital Infra-Red Radiation System; Rectangular Footprints - Shure DT 6008 User Manual

DIS Digital Conference System
Figure 0-N Increased coverage area caused by added radiation
power
Figure 0-O Reduced coverage area caused by differences in cable
signal delay
Figure 0-N and Figure 0-O illustrate the effect of
overlapping footprints and differences in signal
delays. The lower the carrier frequency, the less
susceptible the receiver is for differences in signal
delays. The signal delays can be compensated by
using the delay compensation switches on the
radiators (see section 0).
Planning an DCS 6000 Digital infra-red
radiation system

Rectangular footprints

Determining the optimal number of infra-red
radiators required to give 100% coverage of a hall
can normally only be done by performing a site test.
However, a good estimation can be made by using
'guaranteed rectangular footprints'.
Figure 0-A and Figure 0-B show what is meant by a
rectangular footprint.
rectangular footprint is smaller than the total
footprint. Note that in Figure 0-B the 'offset' X is
negative because the radiator is actually mounted
As can be seen,
beyond the horizontal point at which the
rectangular footprint starts.
The guaranteed
various number of carriers, mounting heights
and mounting angles can be found in section 0.
The height is the distance from the reception
plane and not from the floor.
Figure 0-A
Figure 0-B
Guaranteed rectangular footprints can also be
calculated with the footprint calculation tool
(available on the documentation CD-ROM). The
given values are for one radiator only, and
therefore do not take into consideration the
beneficial effects of overlapping footprints. The
beneficial effects of reflections are also not
included. As rule of thumb can be given for
systems with up to 4 carriers, that if the receiver
can pick up the signal of two adjacent radiators
the distance between these radiators can be
the
increased by a factor 1.4 approximately (see
Figure 0-C).
11
rectangular
A typical rectangular footprint for a mounting angle of
15°
A typical rectangular footprint for a mounting angle of
90°
User Manual
footprints for