Toa IR-700D User Manual

Page 11

[Example 2]
When connecting 4 infrared wireless receivers to a single tuner using a single coaxial cable

Precondition: Cable distance (L2) from the distributor YW-1024 to the receiver is assumed to be 25 m (27.34 yd).

Assuming that the RG-59/U coaxial cable is used in wiring between the YW-1024 and the receiver, the
attenuation of this distance is:

Attenuation = 3.3 dB x (25 m / 100 m) = 0.825 dB.

Since loss of 8.5 dB results from the YW-1024, the maximum permissible loss from the IR-700D to the YW-
1024 stands at 2.675 dB (12 dB – 0.825 dB – 8.5 dB).

If the RG-6/U coaxial cable is used in wiring from the IR-700D to the YW-1024, given the wiring distance
between the two is L1,

L1 = (coaxial cable attenuation/coaxial cable attenuation per 100 m)

= (2.5 dB / 2.7 dB) x 100 m
= 92 m (100.61 yd)

Maximum cable length (wiring distance from the IR-700D to the infrared wireless receiver) can be found from
the following equation:

L = L1 + 25 m

= 92 m + 25 m
= 117 m (127.95 yd)

Similarly, the maximum cable length (wiring distance from the IR-700D to the receiver) calculated relative to
the type of coaxial cable used between the IR-700D and the YW-1024 is as shown in the table below:

25 m or 27.34 yd (L2)

BNC plug-to-BNC plug cord
(supplied with the IR-700D)

Infrared wireless receiver

Infrared wireless tuner

Distributor

YW-1024

Infrared wireless distributor

IR-700D

RG-59/U

348 m (380.58 yd)

RG-6/U

414 m (452.76 yd)

RG-11/U

542 m (592.74 yd)