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1. UTRECHT BLOCK DIAGRAM 5 29 Pay et sir 3 PAGE 5 User Manual PS 29 M Issue 2011 ASL Intercom BV 8 0 PART LINE TECHNICAL CONCEPT User stations in an ASL intercom system are interconnected 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 for the audio signal and one wire for the DC power The screen of the microphone cable functions as earth return Current drive is used for signal transfer Each intercom 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 headphones or loudspeakers the line impedance is situated in the power supply between XLR pin 3 and pin 1 This principle has the following advantages The use of a single audio line allows several intercom stations to talk and listen simultaneously e Due to the high bridging impedance offered by each intercom station The number of stations on the party line has no influence on the level of the communications audio signal e 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 and2. line start flashing 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 User Manual PS 29 M October 2013 ASL Intercom BV 4 0 REAR PANEL CONNECTORS 4 5 These XLR 3 connectors are for connecting the LINE connector channel A LINE connector channel B PS 29 M to intercom party lines Pin assignments Pin 1 OV ground shield Pin 2 30V DC power wire Pin 3 audio wire 5 0 7 8 BOTTOM PANEL CONTROLS SIDE TONE trimmer channel A SIDE TONE trimmer channel B With the side tone trimmers 7 and 8 one adjusts the level of your voice as you hear in your headset for each channel separately Adjustment procedure Turn trimmer fully clockwise Switch the microphones of all speaker stations connected to the referring party line channel off 6 HEADSET connector This XLR 4 connector is for connecting a headset to the PS 29 M 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 As an option the PS 29 M can be fitted with a XLR 6 headset connector allowing to hear channel A on the left headset can and channel B on the right headset can binaur
3. 40 60 dB Presence filter 6 dB at 5 kHz Power to electret mic 9V DC TECHNICAL SPECIFICATIONS PS 29 M Headphone Driver Amps Max load 200 O Max output level monaural 16 Vrms 200 O binaural 2x 10 3 Vrms 400 Q Max output power monaural 1 3 Wrms 200 O binaural 2x 0 27 Wrms 400 O PS 29 M Power Consumption Current at 30V DC 30 mA quiescent 45 mA signaling 170 mA at max output signaling PS 29 M Dimensions amp Weight Width 90 mm Height 48 mm incl clip Depth 124 mm Weight 425 grams 0 dB defined as 775 mV into open circuit ASL reserves the right to alter specifications without prior notice 7 0 BLOCK DIAGRAM PS 29 M ALR pin z A XLA pin DA U power A LINE LI BUFFER A POWER AMPLIFIER ELECTRORIC TALE EWITCH A pM D P gt LISTEN VOLUME A MICROPHONE M e SIDETONE ADJUSTMENT TALK LED A t 2 MIC GAIN 6 XLR pin 3B 5 LINE B St NL ISM MIC BUFFER B POWER AMPLIFIER 4 00 ELECTRONIC L TALK SWITCH CURRENT SOURCE B LISTEN VOLUME B NORMAL ia ll BINAURAL p a cy MULTI TALK LED B SIDETONE ADJUSTMENT B VIBRATOR TALK SWITCH B CALL LED A LINE A 3 a CURRENT SOURCE A E AUDIO FILTER A OMPERATOR CALL SWITCH A en ERATO CURRENT SOURCE B CALL SWITCH B AUDIO FILTER B CDH T gt COMPERATOR CALL LED B ASL Inbeneom 354 2E
4. ANALOG INTERCOM PS 29M DUAL CHANNEL BELTPACK IN METAL CASE TALK y TALK S USER MANUAL October 2013 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 info asl inter com Web www asl inter com CONTENT OF THIS USER MANUAL 1 0 GENERAL 22 2 22 INSTALLATION 3 0 FRONT PANEL 5 4 0 REAR PANEL 85 5 0 BOTTOM PANEL 5 6 0 TECHNICAL SPECIFICATIONS PS 29 7 0 BLOCK 529 8 0 PART LINE TECHNICAL CONCEPT e 10 0 SYSTEM CONFIGURATION 2222 22 11 0 EARTHING User Manual PS 29 October 2013 ASL Intercom BV 1 0 GENERAL DESCRIPTION The PS 29 Mis a portable dual channel intercom Station It is housed in a strong metal case provided with a steel belt clip On the front panel the un
5. al use e Activate the Talk function of the referring channel Turn up the listen volume of this channel Speak into the headset microphone Adjust the listen level by turning the side tone trimmer The operating area of the trimmers 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 referring party line channel 9 BUZZER VOLUME trimmer This trimmer adjusts the volume of the internal buzzer located behind the front panel The buzzer is activated when a CALL button on this beltpack or on any other intercom station connected to one of both party lines 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 10 MIC GAIN trimmer This trimmer is to adjust the mic gain To increase the gain turn clockwise and to decrease the gain turn counter clockwise User Manual PS 29 M October 2013 ASL Intercom BV 6 0 Intercom System Dynamic range 80 dB 1 kHz THD lt 1 Frequency response 200 Hz 15 kHz 3 dB Call signal 2 8 mA Call signal threshold receive 2 4V DC Operation voltage 24 32 V DC Power interrupt time mic mute 0 1 sec Intercom Line Impedance 350 1 kHz 2 2 DC Audio level nom 18 dBu max 0 dBu Side Tone Rejection 0 30 dB adjustable Buzzer Max SPL 85 dBA Mic pre amp Gain
6. as close as possible to where most power consumption occurs in other words most user stations are placed Connect ASL powered units to a clean mains outlet Master stations or power supplies should be connected to the mains outlet with a clean earth Other audio equipment may be connected to this mains outlet but avoid using mains outlets which also power dimmer controlled lighting systems User Manual PS 29 M Issue 2011 ASL Intercom BV 10 0 SYSTEM CONFIGURATION 2 CHANNEL INTERCOM NETWORK CONFIGURATION 11 0 EARTHING CONCEPT POWER SUPPLY Z1 Z2 Line Impedances Mains Earth a EHE ES CE Wallbox iin 5 ONLY ONE Individual intercom line shield EARTHING POINT not to be connected with overall shielding PN REED UE GERE Overall shield of multipair cable and or metal cable trunk EARTHING CONCEPT ASL INTERCOM PAGE 7 User Manual PS 29 M October 2013 ASL Intercom BV
7. dged headphone amplifiers communication is very comfortable 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 or momentary and Remote Mic Mute facility The PS 29 is fully protected against wiring mistakes reverse power or short circuit in the interconnecting cables Latched switching If a TALK button is pushed shortly it is electronically latched and the microphone signal is sent to the referring 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 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 buttons To activate the Call function for the referring party line channel With a momentary push a Call signal is sent to all intercom stations connected to that channel The Call LEDs on this PS 29 M and on all stations connected to the same party
8. interpreted as a Call signal 9 0 CABLING The intercom lines the party lines 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 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 only shielded two conductor cable minimum 2x 0 30 2 In case multi pair 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 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 Earthing Concept Connect cable trunks connection boxes and overall multi pai
9. it has for each channel A and B separately a Volume listen level control a TALK push button and a CALL push button both with LED indicators On the rear panel are two XLR 3 connectors for the intercom connection cables two party lines and an XLR 4 headset connector As an option an XLR 6 headset connector can be fitted allowing to hear channel A at the left headset can and channel B at the right headset can binaural use On the bottom panel are side tone trimmers one for each channel a buzzer volume trimmer and a mic gain trimmer 2 0 INSTALLATION The necessary DC voltages are derived from the intercom master station or power supply via the intercom connection cables To connect the PS 29 M to the intercom system use professional flexible microphone cable with 2 wires and 1 shield only 3 0 FRONT PANEL CONTROLS 6 TALK TAK 2 k 1 VOLUME control knobs To adjust the listen levels for each channel separately 2 TALK buttons These buttons allow talking to each channel separately or to both channels simultaneously If a TALK button is on its green LED is lit Momentary switching If a TALK button is pushed and held the microphone signal is sent to the referring intercom channel until the button is released opecial 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 bri
10. r cable screens to clean earth Metal cable trunks metal connection boxes and overall multi pair cable screens should be interconnected and at one point the central earth point in the intercom network only be connected to a clean earth or a safety earth see Earthing Concept Keep metal connection boxes and trunks 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 parts 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 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 90 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
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