19
GB
After allocating channels, make sure that the transmitters at all the screens are running and that
no crosstalk or interference occurs at any of the screens.
While you are checking the system, you may recognize problems such as crosstalk or
interference.
Correct transmission can more easily be determined by sound than by captions.
Evaluate HI/VI sound at the center of the auditorium as shown in the illustration below. The
characteristics of the wireless antenna can make data reception in the corner areas of an
auditorium difficult. Also, keep obstacles (including your hand) away from the receiver.
If HI/VI sound breakup occurs frequently, it is likely a result of one or both of the following:
1) Channel allocation does not satisfy the fundamental allocation, resulting in crosstalk.
Check channel allocation again.
2) Another wireless system is causing interference.
A wireless system using the 2.4GHz frequency may be causing interference.
This section explains how to avoid crosstalk or interference without the need for specialized
equipment. The same approach can be applied in the case of a caption problem. If you cannot
solve the problem, it is likely that specialized equipment is required to resolve it. In this case,
contact a service office.
The illustration below shows a case where sound breakup occurs at Y4 (shown in gray).
Detecting Crosstalk and Interference
Avoiding Crosstalk and Interference
Auditorium
Unallocated channels
G1
G2
G3
G4
G5
G7
Y4
Y4
Y5
Y7
Y1
Y2
Y3
G1
G6
Y6
