VISSONIC Electronics Limited www.vissonic.com
Fig. symmetrical connection (preferred)
3.4.3
Rectangle Coverage
The actual required number of the radiator can only
be determined by field test, but using “rectangle
coverage” can ensure a very close
Fig. 3-7 90°installation’s typical rectangle
coverage
3.5
Installation steps of radiator
guess.
Fig.3-6 and Fig.3-7 explain what is the “rectangle
coverage”, from which we can see that the rectangle
coverage is smaller than the total coverage. Notice: in
Fig.3-7, “deviation value” X is negative and the
rectangle coverage is actually bigger than the actual
coverage.
Fig.3-6 15°installation: typical rectangle coverage
◆
Take the instructions mentioned in section
1.4 to decide the positions of the IR radiator
◆
Draw out the rectangle coverage in the layout
draft of the room
◆
If there are some areas which can receive signal
from two neighbor radiating panels, it means that there
is eclipsing effects. Draw out the enlarged rectangle
coverage in the layout draft.
◆
Check whether the radiator have full coverage to
certain spots; and if not, extra radiator should be
added.
3.6
Delay switch Settings
In section 1.4.6, there is “overlapping multi-path
effect”: the receiver receive signal from two or more
radiating panels, and “blind spots” can be caused due
to delay difference.
In order to compensate the delay difference, the
delay switch on the side of the radiator can be set to
increase the corresponding panel’s delay. The LCD
can display from 00 to 99, and the digit is timed by
25ns, ie. The delay time can be set is from 25ns to
2475ns (99*25).
Digital IR Language Distribution System User Manual
13
