Toa IR-702T User Manual download pdf (Page 25)

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

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Toa IR-702T User Manual Page 25