L200 - Oakwood Broadcast
Contents
1. West Berlin NJ 08091 Voice 856 719 9900 Fax 856 719 9903 www Pau laudio com OPTIONS 230VAC The WA100 2 tabletop power supply accepts 230VAC 50 60Hz via an IEC320 male 3 pin AC input connector User supplies a matching line cord for the local power system Battery Operation Alkaline battery packs BBU100 1 and 24VDC converters for operation from 12V belt pack or automotive batteries DC100 1 power modules are available MAINTENANCE There is no routine maintenance required by your amplifier If you have a problem check panel LED indicators to assure that the units have DC power eliminate by substitution input and output cables connectors downstream devices DC interconnect cables and Wall Wart power supplies POWER SUPPLY LEVELS The recommended loaded DC input voltage range is 22VDC minimum to 32VDC maximum over the full range of AC line voltage tolerances The audio circuits continue to work with reduced headroom below 22VDC Momentary surges up to 36VDC will cause some increased internal heating but above 36VDC may cause IC failure OPERATING POINTS An internal reference voltage equal to 1 2 the supply voltage is generated All audio stage IC inputs and outputs should show a DC level equal to this voltage when measured with a high impedance meter Audio inputs and outputs are capacitor coupled and ground referenced MODIFICATIONS lf more gain is required for a particular application increase the values of R252. left and R34 right 20K ohms adds 6dB 30K ohms adds 10dB 62K adds 16dB 100K adds 20dB A corresponding decrease in the input clipping level will result SUMMING AMPLIFIER if you wish to sum the inputs remove the cover and find the jumper plug J4 Move J4 from the parked position so that it jumps both terminal pins Either input signal will now appear at both outputs at a level as set by the individual input gain control The summing network causes 6dB of loss however the two inputs sum to 3dB 6dB for in phase sine waves Audio Technologies Inc 154 Cooper Road 902 West Berlin NJ 08091 Voice 856 719 9900 Fax 856 719 9903 www Pau laudio com PERFORMANCE SPECIFICATIONS GAIN NOMINAL LEVELS PEAK LEVELS NOISE 20kHz B W HARMONIC DIST FREQUENCY RESP CROSSTALK INPUT IMPEDANCE OUTPUT IMPEDANCE DIMMENSIONS CONNECTORS POWER POWER SUPPLIES WA100 1 WA100 2 BBU100 1 DC100 1 28dB maximum OdB at 12 o clock pot position 4dBu in 4dBm out to 600 ohm balanced load 24dBu in 22 dBm out to 600 ohm balanced load 90dBm maximum output 02 Max at Peak Level 20Hz to 20 kHz 005 max at Nominal Level 25dB 20 to 20 000Hz 70dB minimum at 10kHz Balanced 40kohm bridging Balanced 40 ohms maximum Zs 1 5 H by 5 5 W by 5 75 D Weight 1 5 Lb Net XLR balanced input outputs 24VDC 07A connector sleeve is positive All units require 24VDC power supply which is ordered s
3. to interrupt a hum producing ground loop by opening the unit and clipping out the GND LIFT jumpers Unbalanced lines use pin 2 as HI and ground pins 3 and 1 Active balanced outputs and inputs require a reference ground connection to the source or receiving device for proper operation This ground can be provided by the rack frame or a studio buss connection if it is not carried through by the output cable shield GROUNDING Operation in high RF broadcast environments requires special attention to grounding and shielding The chassis must be grounded directly to a good low impedance studio ground system Input and output connections must be properly shielded and free of ground loops It may even be necessary to add shielding to the DC input leads to avoid RF pickup POWER DISTRIBUTION Multiple amplifiers sharing a single wall wart power supply should be looped through each other using the DC interconnect cables P N20602 1 Hum and noise performance of the units can be degraded by poor DC ground connections between units sharing a common supply use of the recommended rack and desk mounting kits will assure a good ground connection between units by firmly strapping their chassis together CAUTION The outer shell of the DC interconnect cables is positive relative to the chassis Do not allow a DC cable plugged into a powered unit to hang loose where it might short against the chassis or rack frame Audio Technologies Inc 154 Cooper Road 902
4. L200 LINE SUM MIKE AMPLIFIER OPERATING AND MAINTENANCE MANUAL Copyright 1997 2005 Audio Technologies Incorporated Printed in USA Audio Technologies Inc 154 Cooper Road 902 West Berlin NJ 08091 Voice 856 719 9900 Fax 856 719 9903 www Pai laudio com DESCRIPTION Your L200 Dual Line Buffer Amplifier is an inexpensive high performance amplifier which is ideal as a gain block attenuator impedance converter summing amplifier and signal splitter The inputs provide balanced 40Kohm bridging impedance for line levels up to 24dBm The high input impedance allows the L200 input to also bridge 10dBu hi fi RCA plug lines without loading Front panel screwdriver adjust full range gain controls provide 26dB gain at full clockwise rotation unity gain at twelve o clock and a smooth audio taper to full off The output drivers are servo controlled ground sensing circuits which will supply over 22dBm to 600 ohm balanced loads and 20dBu to high impedance unbalanced loads The L200 uses rugged XLR type input and output connectors Loop through DC connectors allow several NANOAMPS to share a single external 24VDC power supply Battery packs and DC DC converters for portable use are also available Up to three NANOAMPS will mount side by side in only one rack unit using the available rack mounting kits Your L200 may also be neatly stacked or mounted side by side on your desk with the available angled desk mounting k
5. e the output level applied to the other side thus maintaining equal output to either type of load The output stage provides 6dB gain and will drive loads of 600 ohms and higher Nominal output is 4dBm with clipping at 22dBm 10Vrms into 600 ohm balanced loads for 18dB nominal headroom Maximum output is reduced to 20dBu 7 8Vrms when driving an unbalanced load since the full output swing of only one driver is available This still provides a very comfortable 30dB of headroom above the typical 10dBu nominal unbalanced signal POWER SUPPLY The L200 requires 22 to 30VDC and are designed to share a common external 24VDC Wall Wart type power supply A pair of loop thru DC connectors on the rear of each module permit several units to be daisy chained with P N20602 1 DC power cables to a single power supply The WA100 1 and WA100 2 230VAC are 400mA supplies The L200 draws 7OmA Any combination of which add up to less than the supply rating can be powered by a single supply INSTALLATION UNPACKING Inspect the equipment If there is any visible damage to the unit or to the box it came in contact the factory but do not return anything to ATI without prior authorization and shipping instructions It may be necessary to have the shipping company inspect the unit and the box at your location Count the pieces Don t throw out the boxes and packing material until you are sure you have everything that is coming to you They need either their own s
6. eparately Amplifiers can share a single supply using loop thru DC cable P N 20602 1 Do not exceed rated supply current Wall mount power supply UL 24VDC 4 amp 115 VAC 60 Hz Tabletop power supply 24VDC 4 amp 230 VAC 50 60 Hz with IEC 320 male 3 pin AC input connector User supplies matching AC line cord for local power system Battery Pack unit houses four 9V alkaline batteries batteries not included 4 to 6 hour life DC to DC converter powers several units from 12VDC mobile and belt pack batteries Supplies 24VDC 2amp maximum Audio Technologies Inc 154 Cooper Road 902 West Berlin NJ 08091 Voice 856 719 9900 Fax 856 719 9903 www Pau laudio com 20602 1 DC power cable assembly for looping the DC power between DESK MOUNT KITS 20617 501 Angled Desk Mount Base 20617 502 Angled Desk Mount Base and One Stacker 2 units high 20617 503 Angled Desk Mount Base and Two Stackers 3 units high 20617 504 Stacker 2 units high 20604 504 Horizontal Joiner 2 units side by side RACK MOUNT KITS 21075 501 Rack mount system Audio Technologies Inc 154 Cooper Road 902 West Berlin NJ 08091 Voice 856 719 9900 Fax 856 719 9903 www Pau laudio com
7. eparately ordered WA100 power supply or a DC cable P N20602 1 to share the supply of another Rack and desk mounting hardware may be packed in with the unit even though ordered separately Wall mount power supplies must be ordered separately but may either be included with the unit or shipped in their own box Audio Technologies Inc 154 Cooper Road 902 West Berlin NJ 08091 Voice 856 719 9900 Fax 856 719 9903 www Pau laudio com MOUNTING Single desk mounting kits consist of a pair of angled base plates that mount under the lower front and rear cover screws of a single unit to raise and to tilt it for easy use In addition one or more sets of vertical stacking plates mounting to the upper front and rear cover screws of the bottom unit allow multiple units to be stacked Several units can be desk mounted side by side and even stacked side by side using horizontal joiner kits together with mounting base and stacker kits P N20617 501 is the angled base kit P N20617 502 is the base plus one stacker kit two high P N20617 503 is the base plus two stackers three high P N20617 504 is the stacker kit by itself and P N20604 504 is a horizontal joiner kit Rack mount system 21075 501 mounts three units in one rack WIRING AUDIO CONNECTIONS Balanced XLR type inputs and outputs are wired per figure 1 with pins 2 as HI and pins 3 as LOW Pin 1 is the cable shield and ground connection Pin 1 is grounded as shipped but may be floated
8. its CIRCUIT DESCRIPTION INPUT STAGES The balanced input stages of the L200 Line Amplifier utilize a FET input LF347 quad opamp in a clean quiet inverting instrumentation amplifier configuration Input levels up to 24dBm will be handled without clipping excess levels cause only clean clipping without hang up or phase reversal Equal 6dB gains from both HI and LO inputs allow unbalanced sources to be easily accommodated Bridging impedance is a high 40Kohms with good CMR GAIN STAGES A low noise NE5532 provides 26dB maximum gain Inexpensive linear controls are used in a unique circuit configuration to provide a logarithmic gain control characteristic in a variable gain stage with optimum noise performance Output noise at unity gain is low enough to allow performance to exceed 16 bit digital dynamic range even at 10dBu nominal output Audio Technologies Inc 154 Cooper Road 902 West Berlin NJ 08091 Voice 856 719 9900 Fax 856 719 9903 www Pau laudio com LINE OUTPUT Balanced output stages of the L200 utilize a unique active balanced output driver IC the Analog Devices SSM2142 that senses whether the connected load is balanced and floating or is unbalanced due to either side being grounded A balanced output load will be driven with equal and antiphase levels on the HI and LO output lines An unbalanced one side grounded load will cause the driver IC to shut off the signal output to the grounded side of the load and doubl
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