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Digital IR Language Distribution System User Manual

Fig. symmetrical connection (preferred)

3.4.3 Rectangle Coverage

The actual required number of the radiating

panels can only be determined by field test, but

using “rectangle coverage” can ensure a very

close 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

Fig. 3-7 90°installation’s typical rectangle

converage

3.5 Installation steps of radiating panels

◆ Take the instructions mentioned in section

1.4 to decide the positions of the IR radiating

panels

◆ 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 radiating panels have full

coverage to certain spots; and if not, extra

radiating panels 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 radiating panel

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).

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