Overlapping Footprints And; Multipath Effects - Danish Interpretation Systems DCS 6000 User Manual

DIS
Figure 3.3-M Radiator for covering seats beneath a balcony
3.3.6

Overlapping footprints and

When the footprints of two radiators partly

multipath effects

overlap, the total coverage area can be larger
than the sum of the two separate footprints. In
the overlap area the signal radiation power of
two radiators are added, which increases the
area where the radiation intensity is larger than
the required intensity.
However, differences in the delays of the signals
picked up by the receiver from two or more
radiators
can result in that the signals cancel each other
out (multi path effect). In worst-case situations
this can lead to a loss of reception at such
positions (black spots).
User Manual DCS 6000 Digital IR System rev H.docx
Figure 3.3-N Increased coverage area caused by added
radiation power
Figure 3.3-O Reduced coverage area caused by differences
Figure 3.3-N and Figure 3.3-O illustrate the effect
in cable signal delay
of overlapping footprints and differences in
signal delays. The lower the carrier frequency,
the less susceptible
differences in signal delays. The signal delays
can be compensated by using the delay
compensation switches on the radiators (see
section 3.5).
User Manual
the receiver is for
13