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PS 19
SINGLE CHANNEL BELTPACK
USER MANUAL
August 2016
This product is designed and manufactured by:
ASL Intercom BV
Zonnebaan 42
3542 EG Utrecht
The Netherlands
Phone: +31 (0)30 2411901
Fax: +31 (0)30 2667373
E-mail: [email protected]
Web: www.asl-inter.com
CONTENT OF THIS USER MANUAL
REAR PANEL CONNECTORS ........................................................................... 4
TECHNICAL SPECIFICATIONS ......................................................................... 5
PART LINE, TECHNICAL CONCEPT ................................................................ 6
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User Manual PS 19 / August 2016 © ASL Intercom BV
1.0 GENERAL DESCRIPTION
The PS 19 is a portable single channel intercom station. It is housed in a strong ABS case provided with a steel belt clip.
On the front panel are a Volume (listen level) control, a TALK and a CALL push button with
LED indicators, a side tone trimmer and a buzzer volume trimmer. On the rear panel are XLR-3 connectors for the intercom connection cable (the
‘party line’) and an XLR-4 connector for the headset.
Special attention has been paid to the intelligibility of speech. By applying low noise / high speed op-amps, a speech presence filter and propriety high power bridged headphone amplifiers, communication is very comfortable
2.0 INSTALLATION
This PS 19 will form a part of an existing or new intercom system. Connection to it is straightforward. There are no separate power connections or batteries to install as the necessary DC voltages are derived from the intercom master station or power supply, via the intercom connection cable.
3.0 FRONT PANEL CONTROLS
even in environments with a high level of background noise.
The unique ASL call system provides both a flashing red LED and a very distinctive sound signal. A momentary push of the Call button makes the red LED flash whilst holding the button for 2 seconds activates the Call sound signal.
The volume of this sound signal (the buzzer) can be adjusted at the front panel.
Fully electronic switching increases reliability and allows for:
‘soft’ microphone On switching, latched and momentary
Remote Mic Mute facility
To connect the PS 19 to the intercom system use professional flexible microphone cable with 2 wires and 1 shield only. Connect this cable to the
LINE connector on the rear panel.
The PS 19 is fully protected against mis-wiring
(reverse power) or short circuit in the interconnecting cables.
1 VOLUME control knob
To adjust the listen level for the headset
2 TALK button
By pushing this button the signal of the headset microphone is sent to the intercom party line.
When the TALK button is switched On, its large green LED is lit.
Momentary switching:
If the TALK button is pushed and held, the microphone signal is sent to the intercom channel until the button is released.
Latched switching:
If the TALK button is pushed shortly it is electronically latched and the microphone signal is sent to the intercom channel. If pushed again the TALK button switches Off.
Mic Mute when latched On:
After a so-called Mic Mute signal has been received from a Pro Series master station or power supply, the connection between microphone and intercom channel is interrupted.
By pushing the TALK button, the connection is restored and one can talk to the intercom channel again.
3 CALL button
By pushing this button the Call function is activated. With a momentary push a Call signal is sent to all stations connected to the intercom party line. The Call LED’s of this beltpack and of all stations on the party line start flashing.
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User Manual PS 19 / August 2016 © ASL Intercom BV
By keeping the Call button pushed for 2 seconds the Call Buzzers are activated, provided the buzzers are not muted by a Buzzer Mute signal received from a Pro Series master station or power supply. After the CALL button is released the LED’s continue to flash for a further 2 seconds.
4 SIDE TONE trimmer
To adjust the level of on e’s own voice in one own headset.
Adjustment procedure:
Set trimmer in start position: turn fully clockwise
Switch Off the microphones of all
(speaker) stations connected to the party line
Push the TALK button
4.0 REAR PANEL CONNECTORS
Turn up the listen volume
Speak into the headset microphone
Adjust the listen level by turning the side tone trimmer
The operating area of the trimmer is between fully clockwise and minimum level. Adjusting the side tone does not affect the level of your voice as heard by the other stations on the party line.
5 BUZZER VOLUME trimmer
To adjust the volume of the internal buzzer
(located behind the front panel).
The buzzer is activated when the CALL button on this beltpack (or on any other intercom station connected to the party line) is pushed longer than
2 seconds, provided the buzzers are not muted by a Buzzer Mute signal received from a Pro
Series master station or power supply.
6 LINE connectors (XLR-3)
To connect the PS 19 to the intercom party line.
The female connector is for input and the male connector for extending the intercom party line to other stations (daisy chaining)
Pin assignments:
Pin 1: 0V / ground shield
Pin 2: +30V DC power wire
Pin 3: audio wire
5.0 INTERNAL CONTROLS
MIC GAIN trimmer
To adjust the mic gain.
One has to open the PS 19 by removing the 4 screws at the underside. The trimmer is situated on the lower PCB board. To increase the gain, turn clockwise. To decrease the gain, turn counter clockwise.
7 HEADSET connector (XLR-4)
To connect a headset to the beltpack.
The impedance of the headset can must be minimum 200 ohms; in case the headset has 2 cans in parallel, the impedance of each can must be minimum 400 ohms.
Pin assignments:
Pin 1: shield mic. (GND)
Pin 2: mic. +
Pin 3: phones +
Pin 4: phones –
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User Manual PS 19 / August 2016 © ASL Intercom BV
6.0 TECHNICAL SPECIFICATIONS
System
Dynamic range: 80 dB (1 kHz, THD < 1%)
Frequency response: 200 Hz - 15 kHz (-3 dB)
Call signal: 2.8 mA
Call signal threshold (receive): +2.4V DC
Operating voltage: 24 – 32 V DC
Power interrupt time (mic mute): 0.1 sec
Intercom Line
Line Impedance: 350 Ω (1 kHz) / 2.2 kΩ (DC)
Audio level: nom. -18 dBu, max. 0 dBu
Mic pre-amp
Gain: 40
– 60 dB (adjustable internally)
Presence filter: +6 dB at 5 kHz
Power to electret mic: +9V DC
Headphone Driver Amps
Max output level: 16 Vrms @ 200 Ω
Max output power: 1.3 Wrms @ 2 00 Ω
7.0 PS 19 BLOCK DIAGRAM
Side Tone
Rejection: 0 – 30 dB adjustable
Buzzer
Max. SPL: 85 dBA
PS 19 Power Consumption
Current (at 30V DC):
30 mA quiescent
45 mA signalling
170 mA at max. output + signaling
PS 19 Dimensions & Weight
Width: 90 mm / Height: 38 mm
Depth: 124 mm / Weight: 295 grams
0 dB is defined as 775 mV into open circuit
ASL reserves the right to alter specifications without prior notice
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User Manual PS 19 / August 2016 © ASL Intercom BV
8.0 PART LINE, TECHNICAL CONCEPT
User stations and power supplies in an ASL intercom system are connected via one or several 'party lines'.
A party line offers two way (‘full duplex’) communication and consists of standard microphone
(multi-pair) cable. One wire is used as an audio line, one as a power line and the screen of the cable functions as earth/return.
Current drive is used for signal transfer.
Each station utilizes a current amplifier to amplify the microphone signal. That signal is put on the common audio line. Due to the constant line impedance, a signal voltage is developed which can be further amplified and sent to the headphones or loudspeakers.
9 .0 CABLING
This principle has three advantages: o the use of a single audio line allows several stations to talk and listen simultaneously o due to the high bridging impedance offered by each station, the number of stations on the party line has no influence on the level of the communications audio signal o power and audio to the intercom stations use the same cable
Also the Call signal is sent as a current, on the audio wire. It develops a DC potential over the line impedance which is sensed by each intercom station and interpreted as a Call signal.
The intercom lines (the ‘party lines’) in an ASL analog intercom system are of the shielded two-conductor microphone cable type. The intercom line connectors are of the XLR-3 type. Audio and Call signals are on pin 3, DC power is on pin 2 and pin 1 is connected to the shield of the cable which functions as the common return for audio and power.
The audio signal is transferred in an unbalanced way (see ‘Party Line, Technical Concept’).
To avoid earth loops (hum), the possible effect of electromagnetic fields and to minimize power loss, certain rules have to be obeyed when installing the cabling of an intercom system :
Use high quality cable that they are isolated from any other metal housing or
Use high quality microphone cable (shielded two conductor cable, minimum 2x 0.30 mm2). In case multi-pair microphone cable is used, there should be an overall shield and each pair should consist of two conductors (minimum 2x 0.15 mm2) with separate shield
Use flexible cable construction part.
Keep cables parallel as much as possible
When two (multi channel) units in a network are connected by more than one cable, make sure that these cables are parallel to each other over the whole distance between those units. When using multi-pair cable, parallelism is ensured in the best possible way.
Use flexible single and multi-pair microphone cable instead of cable with solid cores, especially when the cable is subjected to bending during operation or installation.
Cable screens to XLR pin 1
The screen of each separate microphone cable and/or the screen of each single pair in a multi-pair cable, should be connected to pin 1 of each XLR-3 connector. Do not connect these screens to the metal housing of ASL units or XLR-3 wall boxes.
See section ‘Earthing Concept’.
Connect metal cable trunks, wall boxes and overall multi-pair cable screens to clean earth
Metal cable trunks, metal wall boxes and overall multipair cable screens should be interconnected and, at the 'central earth point' in the intercom network only, be connected to a clean earth or a safety earth.
See section ‘Earthing Concept’.
Keep metal connection boxes and cable trunks or pipes isolated from other metal parts
Metal trunks or pipes for intercom cables and metal connection boxes should be mounted in such a way
Avoid closed loops
Always avoid that intercom cables are making a closed loop. So-called 'ring intercom' should not physically be cabled as a ring..
Keep cables away from electromagnetic sources
Keep intercom cables away from high energy cables, e.g. 115/230/400V mains power or dimmer controlled feeds for spotlights. Intercom cables should cross high energy cables at an angle of 90º only. Intercom cables should never be in the same trunks as energy cables.
Place power supply in a central position
In case of a system powered by a separate power supply: In order to diminish power losses, place the power supply as close as possible to where most power consumption occurs, in other words most user stations are placed.
ASL powered units to a 'clean' mains outlet
Master stations or power supplies should be connected to a mains outlet with a clean earth. Other audio equipment may be connected to this mains outlet, but avoid using an outlet which also powers dimmer controlled lighting systems.
10.0 SYSTEM CONFIGURATION
11.0 EARTHING CONCEPT
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User Manual PS 19M / Issue 2011 © ASL Intercom BV
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