Toa IR-700D - Manual (Page 10)

10
9. SUPPLEMENTARY REMARKS
(How to find a maximum cable length from IR-700D to receiver)
Cable distance values here are provided merely as a guide, since such values differ depending on the
structure of buildings and environmental conditions of the infrared wireless receiver.
9.1. Wiring Design Confirmation
Maximum permissible loss on cable routing must be taken into consideration when calculating wiring between
infrared wireless receivers and the tuner. The cable routing loss is caused by distribution loss and cable
attenuation, and the sum of both must not exceed 12 dB.
The loss value for each is as follows:
(1) Loss of the YW-1022 (2-branch distributor): 4.5 dB
(2) Loss of the YW-1024 (4-branch distributor): 8.5 dB
(3) Attenuation for 100 m (109.36 yd) of coaxial cable: As shown in the table below.
Note: The IR-700D causes no distribution loss.
RG-59/U 3.3 dB
RG-6/U 2.7 dB
RG-11/U 2.0 dB
Total attenuation for the connection example illustrated below is as follows:
Cable attenuation = (length/100) x attenuation per 100 m
Total attenuation = Cable 1 attenuation + Cable 2 attenuation + YW-1022/1024 distributor's attenuation
If this total attenuation does not exceed 12 dB, then there should be no problem.
9.2. Design Examples
[Example 1]
When connecting 2 infrared wireless receivers to a single tuner using 2 coaxial cables
Because no distribution loss is caused by the IR-700D, only the
coaxial cable loss determines the maximum cable distance.
The table at right shows the relationship of coaxial cable type to
maximum cable distance.
BNC plug-to-BNC plug cord (supplied with the IR-700D)
Infrared wireless receiver
IR-500R or IR-510R
Infrared wireless tuner
Infrared wireless distributor
IR-700D
Infrared wireless receiver Infrared wireless tuner
Coaxial cable 1 attenuation Coaxial cable 2 attenuation
Coaxial cable 1 Coaxial cable 2
Distributor
YW-1022/1024
BNC plug-to-BNC plug cord
(supplied with the IR-700D)
Infrared wireless distributor
IR-700D
RG-59/U 606 m (662.73 yd)
RG-6/U 740 m (809.27 yd)
RG-11/U 1000 m (1093.61 yd)