PS 10_New - ASL Intercom BV

PS 10_New - ASL Intercom BV
PS 10 – SINGLE CHANNEL
IFB RECEIVER
User Manual
January 2017
V1.0
Table of contents
1.0 GENERALDESCRIPTION.............................................................................................3
2.0 UNPACKING..............................................................................................................3
3.0 INSTALLATION..........................................................................................................3
4.0 WARRANTY...............................................................................................................3
5.0 FRONTPANELCONTROLS..........................................................................................4
6.0 REARPANELCONNECTORS.......................................................................................4
7.0 TECHNICALSPECIFICATIONS......................................................................................5
8.0 PARTYLINE,TECHNICALCONCEPT.............................................................................5
9.0 CABLING...................................................................................................................6
10.0
POSSIBLESYSTEMCONFIGURATION.......................................................................8
11.0
EARTHINGCONCEPT..............................................................................................9
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1.0
GENERAL DESCRIPTION
The PS 10 is a single channel analog intercom station for “Listen Only” purposes. It is often
used as an IFB Receiver. The unit is housed in a strong metal case provided with a metal
belt clip.
On the front panel are a Volume (listen level) control and a mini jack connector to connect
a headphone or earpiece. On the rear panel is an XLR-3 connector for the intercom connection cable (the party line).
By applying low noise / high speed op-amps, a propriety speech presence filter and a highpower headphone amplifier, communication is very comfortable even in environments
with a high level of background noise.
2.0
UNPACKING
After unpacking the unit please inspect for any physical damage and retain the shipping
carton and relevant packing materials for use should the unit need returning.
If any damage has occurred, please notify your dealer immediately so that a written claim
can be initiated. Please also refer to the warranty section of this manual.
3.0
INSTALLATION
Connecting the PS 10 to an intercom system is straightforward. The necessary DC voltages
are derived from the intercom master station or power supply, via the intercom connection cable.
Use professional flexible microphone cable with 2 wires and 1 shield only. Connect this
cable to the LINE connector on the rear panel of the PS 10. The unit is fully protected
against wiring mistakes (reverse power) or short circuit in the interconnecting cables.
4.0
WARRANTY
This unit is warranted by ASL to the original end-user purchaser against defects in workmanship and materials in its manufacture for a period of 12 months from date of shipment to the end-user.
Faults arising from misuse, unauthorized modifications or accidents are not covered by
this warranty.
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If the unit is faulty it should be sent, in its original packing, to the supplier or your local ASL
dealer, shipping costs prepaid. A note must be included stating the fault(s) found and a copy of
the original supplier’s invoice.
5.0
FRONT PANEL CONTROLS
1
VOLUME control knob
With this knob the listen level for the headset or earpiece is adjusted
2
Mini Jack connector
To connect a headphone or earpiece
Pin assignment:
Tip:
Phones +
Ring: Phones Fits both stereo and mono headphones
6.0
REAR PANEL CONNECTORS
3
LINE connector (XLR-3)
To connect the PS-10 to the intercom party line.
Pin assignment:
Pin 1: 0V / ground shield
Pin 2: +30V DC power wire
Pin 3: audio wire
4
7.0
TECHNICAL SPECIFICATIONS
System
• Dynamic range: 80 dB (1 kHz, THD < 1%)
• Frequency response: 200 Hz - 15 kHz (-3 dB)
• Operating voltage: 24 – 32 V DC
Intercom Line
• Line Impedance: 350 Ω (1 kHz) / 2.2 kΩ (DC)
• Audio level: nom. -18 dBu, max. 0 dBu
Headphone Driver Amps
• Max output level: 11.6 Vrms @ 200 Ω
• Max output power: 0.7 Wrms @ 200 Ω
PS 10 Power Consumption (@ 30V DC)
• 90 mA at max. output
PS 10 Dimensions & Weight
• Width: 32 mm / Height: 34 mm
• Depth: 88 mm / Weight: 100 grams
0 dB is defined as 775 mV into open circuit
ASL reserves the right to alter specifications without prior notice
8.0
PARTY 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.
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This principle has three advantages:
• the use of a single audio line allows several stations to talk and listen simultaneously
• 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
• 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.
9.0
CABLING
The intercom lines (the ‘party lines’) in an ASL analog intercom system are of the shielded twoconductor 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
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
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 multipair 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.
6
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 multi-pair 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 that they are isolated from any other metal housing or 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.
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.
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10.0 POSSIBLE SYSTEM CONFIGURATION
In the drawing above is a typical IFB (Interruptible Fold Back) configuration:
Two PS-10’s are connected via two intercom party lines to a PS 6379 Mk2 Master Speaker
Station, to channels E and F. These channels can be configured as so-called IFB channels.
If one pushes a TALK button of such a channel the AUX signal routed to that channel is
dimmed by an adjustable degree (“volume ducking”)
The (one way) intercom signal is for instance the director talking to the host of a TV show
and the AUX signal for instance the “N-1 On Air” signal.
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11.0 EARTHING CONCEPT
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: info@asl-inter.com ⎪Web: www.asl-inter.com
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