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WB-200 SERIES INTERCOM SYSTEM — WBS-200 DUAL CHANNEL WIRELESS BASE STATION

EXTERNAL UNITS CONNECTION

The external units connection to the master station is

carried through twin-lead shielded cable and XLR-3-31/XLR-3-

32 connectors. Each base station channel provides one XLR-3-

31 connector and a XLR-3-32 connector wired internally in

parallel mode.

The next list shows the signal distribution in the pin XLR

connectors.

XLR-3-31/XLR-3-32 — INTERCOM LINE

PIN 1

GND

PIN 2 +VDC

PIN 3

SIGNAL

Certain rules have to be followed when installing the cables of an intercom system. This is to

avoid ground loops and to minimize the power loss and possible effect of electromagnetic fields.

Do not connect the XLR pin 1 to the XLR metal housing or to metal wall boxes to avoid ground

loops. The ground loop could increases notably the system background noise.

Do not close the intercom line connection (avoid closed loops). Each intercom line leaves from

the base station towards the remote stations, but it does not return to the master station. If the

connection is closed, a ground loop with the increase from the system noise will take place.

Use high quality cables and minimize its longitude. The DC resistance of a low quality cable or

very long affects to the power consumption, the channels crosstalk and the system frequency

response.

Place the base station the closest possible to the maximum consumption zone; that is to say to

the zone in which more external units are placed.

The next picture shows the habitual connection of an intercom system formed by four

beltpacks units (two for each channel) and a base station WBS-200.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 21 22

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