ATI Technologies DA103 Operating instructions

Audio Technologies Inc. | 154 Cooper Road #902 | West Berlin, NJ 08091 | Voice 856-719-9900 | Fax [phone] | www. audio.com
© Copyright 1997-2007, Audio Technologies Incorporated - Printed in USA
DA103 AND DMA103
AUDIO DISTRIBUTION AMPLIFIER
OPERATING AND MAINTENANCE MANUAL

Audio Technologies Inc. | 154 Cooper Road #902 | West Berlin, NJ 08091 | Voice 856-719-9900 | Fax [phone] | www. audio.com
DESCRIPTION
Your DA103 and DMA103 Audio Distribution Amplifiers are inexpensive high
performance amplifiers designed to split and isolate audio signal lines.
The DA103 accepts a line level input, balanced or unbalanced audio at –20, -10
or +4dBu nominal and provides a line level output at +4dBm nominal level to
balanced or unbalanced output lines. The DA103 input/output connectors are two
piece solderless “Phoenix” types, individual for each input and output line.
The DMA103 accepts a microphone level input signal and provides either line
or microphone level outputs to drive balanced or unbalanced lines. Phantom
microphone power is provided and all audio connections are made using XLR
type connectors.
CIRCUIT DETAILS
The DA103 accepts a maximum line input level of +22dBu to high impedance
(20Kohms) balanced instrumentation amplifier input (A1) and drives three servo
balanced 600-ohm (minimum load) outputs (A3, A4, A5) up to +22dBm
maximum. An internal input gain setting jumper plug optimizes the input stage
gain, noise and headroom for nominal inputs at -20, -10 or +4dBu. The Master
Gain control (R14a) adjusts all outputs simultaneously to compensate for input
signal changes while individual output trimmers accommodate differing nominal
output level requirements from -10dBu to +8dBm. Up to 40dB maximum gain is
available. The servo-balanced outputs automatically detect single-ended (one
side grounded) loads; remove the drive signal from the grounded output and
double the signal applied to the ungrounded output thus maintaining equal gain
for both types of loading.
The DMA103 boosts a microphone level input up to line level with up to 80dB
gain. A low noise transformerless input stage (A1) allows internal DIPswitch (S1)
selection of input gain from 10, 20, 40 or 60dB to optimally match low or high
output microphones. A Master Gain control is provided and individual front
trimmers match differing output level requirements from –10 to +8dBm. Phantom
microphone power at regulated +20.2 VDC from A10 is selected with an internal
DIPswitch and is sufficient for most powered microphones. +48VDC phantom
power is also available as a plug-in option (PH48-1), consult factory. Three
servo-balanced output drivers drive balanced or one side grounded loads and
individual jumper plug 54dB output attenuators (P1, P2, P3) provide –50dBm
microphone level outputs if necessary.

Audio Technologies Inc. | 154 Cooper Road #902 | West Berlin, NJ 08091 | Voice 856-719-9900 | Fax [phone] | www. audio.com
DA 103 and DMA103 require 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 permits 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 DA103 and DMA103 both draw
about 100mA at full output. Any combination, which adds up to less than the
supply rating, can be powered by a single supply.
INSTALLATION
UNPACKING
Inspect the equipment. Shake it to see if anything is rattling around inside. 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.
NANOAMPS need either their own separately ordered WA100 power supply or a
DC cable, P/N20602-1 to share the supply of another NANOAMP.
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.
WIRING
AUDIO CONNECTIONS
DMA103 - balanced XLR type inputs and outputs are wired with pin 2 as HI and
pin 3 as LOW. Pin 1 is the cable shield and ground connection.
DA103 - line level audio connections are made to the Phoenix type two-piece
connectors (Hi - Lo - Shld) using the rear label as a guide. Connectors separate
with a straight pull toward the rear. Strip the wires cleanly without nicking, clamp
them in the plug by tightening the screws and reinsert the plug into the
receptacle.
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 ground bus connection if the cable shield does not
carry it through.

Audio Technologies Inc. | 154 Cooper Road #902 | West Berlin, NJ 08091 | Voice 856-719-9900 | Fax [phone] | www. audio.com
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 NANOAMPS sharing a single wall-wart power supply should be looped
through each other using the DC interconnects 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 can short against the chassis
or rack frame.
SETUP
Before mounting your product in a rack, remove the top cover (4 upper side
screws) and set the preamp gain jumper to match the nominal input line level
(DA103) or for the DMA103 set the preamp gain with the DIP rocker switch to the
highest level that does not cause input circuit clipping. Hot mics will require lower
gains (20 – 30dB) while low output mics will require higher gain settings (40 –
60dB). Also set phantom power on or off as needed and select line (+4dBm) or
mic level (-50dBm) outputs with jumper plugs P1, P2 or P3.
MOUNTING
These may be rack mounted one, two, or three across in a standard EIA 19" rack
and will require only 1 3/4" of vertical space. Rack mount kit P/N20604-501
mounts a single unit, P/N20604-502 mounts two units and P/N20604-503 mounts
three units. Each kit provides a different size pair of rack mounting brackets and
one or two horizontal joiner plates, P/N 20580-1, each with four 4-40 X 5/16" oval
head screws. The joiner plates mount into tapped holes on the bottom of two
side-by-side units, using the supplied screws, while the rack mount brackets
mount under the existing 6-32 cover securing screws on the front sides of the
units.

Audio Technologies Inc. | 154 Cooper Road #902 | West Berlin, NJ 08091 | Voice 856-719-9900 | Fax [phone] | www. audio.com
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.
OPTIONS
230VAC OPERATION
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), 24VDC gel cell rechargeable battery packs
(PPA-1) and a DC converter (DCA100-1) to operate from 12V belt pack, NP-1 or
auto batteries.
48VDC PHANTOM POWER (DMA103 only)
A DC converter (PH48-1) can boost the phantom power up to 48VDC.
MAINTENANCE
There is no routine maintenance required by your NANOAMP. 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. If you are still
experiencing a problem, call us and ask for technical support.
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 will
continue to work with reduced headroom below 22VDC but the phantom
microphone power will drop out of regulation.
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.

Audio Technologies Inc. | 154 Cooper Road #902 | West Berlin, NJ 08091 | Voice 856-719-9900 | Fax [phone] | www. audio.com
SPECIFICATIONS:
GAIN DA103 40, 30,16dB maximum.
DMA103 80, 60, 40, 30dB maximum
NOMINAL LEVELS DA103 +4dBu in, +4dBm out at –4dB preamp gain
DMA103 –50dBu in, +4dBm out at 40dB preamp gain
PEAK LEVELS DA103 +22dBu in, +22dBm out to 600 ohm balanced
DMA103 -20dBu in, +22dBm out to 600 ohm
balanced
NOISE 20kHz B.W. DA103 EIN -85dBu at unity gain
DMA103 EIN -124dBm at 54dB gain
HARMONIC DIST. .02% Max at Peak Levels, .01% max. at Nominal
Levels, 20Hz to 20 kHz
FREQUENCY RESP. -.25dB, 20 to 20,000Hz
CROSSTALK 70dB minimum at 10kHz
INPUT IMPEDANCE Balanced, 20kohm bridging
OUTPUT IMPEDANCE Balanced, 40 ohms maximum Zs
PHANTOM POWER DMA103 only, 20.2VDC regulated, PH48-1 48VDC
phantom power accessory available.
DIMENSIONS in. (cm) 1.75”(4.45)H by 5.6”(14.2)W by 5.75”(14.6)D; Weight
1.25 Lb, (.57Kg) Net
CONNECTORS: DA103: Two-piece, screw clamp, Phoenix type.
DMA103: XLR, locking.
POWER: 24VDC @ .1A nominal, 22Vmin. to 30Vmax, loop thru
cylindrical connectors, 2.0mmID, sleeve is positive.

Audio Technologies Inc. | 154 Cooper Road #902 | West Berlin, NJ 08091 | Voice 856-719-9900 | Fax [phone] | www. audio.com
ACCESSORIES:
All units require 24VDC power supply, which is ordered separately. DAs and
DMAs can share a single supply-using loop thru DC cable (P/N 20602-1). Do not
exceed rated supply current.
WA100-1 Wall mount power supply (UL), 24VDC @ .4 amp, 115 VAC/60
Hz.
WA100-2 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.
BBU100-1 Battery Pack unit houses four 9V alkaline batteries (batteries
not included). 6 to 8 hour life.
PPA-1 (-2) Rechargeable 24VDC gel-cell battery pack with charger for
115VAC (230VAC). 10 to 12 hours typical operation.
DCA100-1 DC to DC converter powers several units from 12VDC mobile
and belt pack batteries. Supplies 24VDC @ .2amp maximum.
20602-1 DC power cable assembly for looping the DC power.
DESK MOUNT KITS:
20617-501 Angled Desk Mount Base
20617-502 Angled Desk Mount Base and One Stacker
20617-503 Angled Desk Mount Base and Two Stackers
20617-504 Stacker (2 units high)
20604-504 Horizontal Joiner (2 units side-by-side)
RACK MOUNT SYSTEM:
21075-501 Mounts 3 units in one rack
FIELD ACCESSORIES:
PROK-1 Side protection plates with slide mounts for quick-change battery packs.
ABAG-1 Carry case with strap for unit plus power pack (includes PROK-1).