Toa IR-702T - Manual (Page 25)

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16. SUPPLEMENTARY REMARKS
(How to find a maximum cable length from infrared wireless tuner 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.
16.1. 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.
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 + Distributor's attenuation
If this total attenuation does not exceed 12 dB, then there should be no problem.
Infrared wireless receiver
Coaxial cable 1 attenuation
Infrared wireless tuner
Coaxial cable 1
Distributor
Coaxial cable 2 attenuation
Coaxial cable 2
16.2. Design Examples
[Example 1]
When connecting 2 infrared wireless receivers to a single tuner using 2 coaxial cables
Because there is no distributor, 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. RG-59/U 606 m (662.73 yd)
RG-6/U 740 m (809.27 yd)
RG-11/U 1000 m (1093.61 yd)
Infrared wireless tuner Infrared wireless receiver
IR-500R, IR-510R, or IR-520R