ATI Technologies DA103 Istruzioni operative

DA103 AND DMA103

AUDIO DISTRIBUTION AMPLIFIER

OPERATING AND MAINTENANCE MANUAL

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.

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.

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.

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.

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.

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).

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