ASL INTERCOM WS-400 Kullanıcı Kılavuzu - Sayfa 6

İnterkom sistemi ASL INTERCOM WS-400 için çevrimiçi göz atın veya pdf Kullanıcı Kılavuzu indirin. ASL INTERCOM WS-400 9 sayfaları. Base station for wireless intercom with four tx/rx modules

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8.0

THE INTERFACE TO WIRED INTERCOM

Each TX/RX module in the WS-400 contains an interface to wired intercom. The interface can be put in "Party Line

Mode" or in "4-Wire Mode", using the Interface Mode Switch on the rear panel.

Party Line Mode (the Mode switch is not pushed):

The XLR-3 male connector (#9) and the XLR-3 female

connector (#10) on the rear panel are now "party line

connectors" for daisy chain wiring purposes. The audio

is sent from the wireless beltpack to the party line of the

wired intercom system and from this system to the

wireless beltpack. In this mode the base station also

handles all CALL functions to and from the party line

intercom and MIC MUTE functions from the party line

intercom.

FREQUENCY BAND & ANTENNA'S

9.0

9.1

Frequencies

ASL‟s wireless intercom uses the 2.4 GHz band, which

is freely available for WLAN (Wireless Local Area

Networks). The ASL system divides the available

bandwidth into 16 overlapping sections, 8 of them being

used as upload frequency (from the beltpack to the

base station) and the other 8 being used as download

frequency (from the base station to the beltpack).

With the channel select switches on base stations and

wireless beltpacks one actually selects an upload /

download pair, called a TX/RX channel.

Each TX/RX channel serves one dedicated wireless

connection between base stations and wireless

beltpacks (in fact between the TX/RX modules in those

units). It is possible to have several WS 19 beltpacks on

the same TX/RX channel, see section 10.2 "Half

Duplex".

When using the ASL wireless system, the following

should be taken into account:

The 2,4 GHz frequency is known to have

difficulty in penetrating concrete walls, steel

walls and other obstructions. Behind

obstructions like these an "HF shadow" may

occur where no communication is possible.

10.0 SETTING UP CONNECTIONS

10.1.

ASL WIRELESS AS A STAND ALONE SYSTEM

10.1.1 Base Station Settings

a. Give each TX/RX module in the base station its

own TX/RX channel by rotating the „Channel

select‟ switch. Try to avoid TX/RX channels to

be physically next to each other, e.g. when two

WS-400‟s are in your wireless system, try to set

them in this order: TX/RX channels 2, 4, 6, 8,

1, 3, 5, 7. If one uses a WS-200 with only two

beltpacks, use TX/RX channels 1 and 6

User Manual WS-400 / February 2011 © ASL Intercom BV .

4-Wire Mode (the Mode switch is pushed):

The XLR-3 male connector (#9) and the XLR-3 female

connector (#10) on the rear panel are now "4-wire

connectors" The female connector is the electronically

balanced input connector for audio from the 4-wire

intercom system to the

wireless beltpack. The male connector outputs the

audio signal from the wireless beltpack to the 4-wire

intercom system as an electronically balanced signal.

The antenna‟s of a base station should have as

much as possible a "line of sight" to the

antenna‟s of the beltpack(s). All objects within

that path make the connection less reliable.

Due to reflections of the HF signal, one might

experience a dropout on a specific spot in a

building; moving a beltpack only a few inches

can be enough to solve the problem.

Because of the use of the WLAN frequencies,

ASL‟s wireless units might experience

interference from units like mobile telephones

with bluetooth and computers with bluetooth or

WLAN cards. Try to change TX/RX channels if

you experience problems with these.

9.2

Antenna Wiring (Base Stations)

If the antennas of a base station are not supposed to be

directly connected to its front panel, a cable between

base station and antenna is needed (base stations are

equipped with SMA connectors - female at the base

station and male at the antenna).

The 2.4GHz frequency experiences a big loss in any

cable, e.g. a RG58 cable has a loss of 1 dB per meter.

So make sure that your cable (50 ohms) is suited for

2.4 GHz and that the cable is as short as possible.

Make the cables in lengths of a multiple of 12, e.g.

lengths of 24cm, 48cm, 120cm, 240cm etc.

b. Make sure the interface mode switch at the rear

of the base station is set to "PARTY LINE". The

internal party line is now linking the on board

TX/RX modules to each other.

c. Turn down the side tone trimmers at the TX/RX

modules (counter clockwise)

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