ASL INTERCOM PS 155 Uživatelský manuál stáhnout pdf (Strana 3)

User Manual PS 155 / Issue 1

8

2001 ASL Intercom, Utrecht, Holland.

3

1.0 GENERAL DESCRIPTION

The PS 155 is a simplex wireless interface

housed in a strong steel case.

Located on the front panel are the Volume

controls (send and receive), sidetone

adjustment trimmers, test tone switch, VOX

adjustment trimmers and TX mode control

switch.

The ASL PS 155 is designed to be a single

channel audio interface between simplex

wireless intercom systems and ASL

partyline intercom systems.

Special attention has been paid to the ease

of operation by the user, enabling to

expand a wired intercom system with a

(locally approved) wireless intercom

section.

By using wireless intercom systems such

as Porto phones etc. the major issue of

licences and approvals can be avoided with

a dramatic drop in cost as a result.

The PS 155 tabletop unit contains an audio

interface. This section splits the audio from

the wired intercom system to, a separate

volume controlled, audio input that is lead

to the wireless intercom system.

It also combines the audio signal from the

wireless system to the wired system, this

signal is also volume controlled.

Both these in/outputs are transformer

balanced.

The three stage, high rejection, sidetone

circuit can be adjusted to maximum setting

using the built-in test tone generator. This

enables the user an optimum performance

for all transmit modes available.

In receive mode (Rx) the audio from the

wireless system is sent to the wired

intercom system, its volume can be

controlled with the ‘Receive’ volume knob.

In transmit mode (Tx) the audio signal from

the wired intercom system is sent to the

wireless system, its volume can be

controlled with the ‘Send’ volume knob.

Three modes are available to switch from

receive to send, the users selects the most

appropriate one with a switch at the front

panel. These modes are:

1. Push To Talk (PTT)

Transmit mode can be enabled by a

switch that can be connected to the PS

155 externally. To enable the transmit

mode, the user pushes a dedicated

button to transmit the audio present at

the wired intercom system.

2. CALL

Transmit mode can be enabled by

pushing any CALL button at the

connected intercom units. All audio

present at the wired intercom will be

broadcast on the wireless system. The

buzzers of all connected stations are

automatically disabled in this mode.

3. VOX

Transmit mode will be enabled by an

audio detection circuit on the wired

intercom. The VOX circuit has a special

frequency contouring circuit which is

optimised for the human voice, the

attack level and release time can be

adjusted at the front panel.

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