Radio Systems DA 2x4b User manual

Radio Systems, Inc. DA-2/4x4b Manual
5/07 Page 1
DA 2x4b & 4x4b
Distribution Amplifier
Manual
EMC and Safety Conformity

Radio Systems, Inc. DA-2/4x4b Manual
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Contents
Overview ....................................................................... 4
Mounting ....................................................................... 4
Operation ...................................................................... 4
Connections .................................................................. 4
Connection Examples ................................................... 6
Parts Layout Power Supply .......................................... 7
Parts Layout Amplifier.................................................. 8
Parts List Power Supply................................................ 9
Parts List Amplifier..................................................... 10
Specifications.............................................................. 11
Using Active Balanced Circuitry ................................. 12
Warranty ..................................................................... 14
Repair Policy ............................................................... 14
Return Instructions..................................................... 14
Declaration of Conformity .......................................... 15

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Overview
The Radio Systems DA-4x4b is designed to function as a super low noise, low
distortionaudiodistributionamplifierwhich may beuser wired tofunction in various
flexibleinputandoutputconfigurations.
Excellentisolationisprovidedbetweenoutputs. Each balancedchannel,regardless
of level set and load, is unaffected by the other channels. The Radio Systems DA-
4x4bDistributionAmplifier allowsaudio sourcesto beroutedto multiplelocations
withvariouslevelrequirements and impedanceswhilemaintainingthe integrityof
signalqualitythroughout.
Thedistribution amplifier isconfigurable to a dual channel, 2x4 outputversion, or
quadchannel,4x4outputversion.
Mounting
The 4x4b occupies only 1 rack unit (1-3/4 inch) of height in a 19 inch EIA rack. To
allowforadequateventilation,avoidmountingtheunitdirectlyabovelargeheat
producing equipment such as power amps or power supplies.
When stacking units, it is recommended that one rack space (1-3/4 inch) remain
openbetweeneverythreeunits.
Operation
Apply an input level of approximately 0dB to the input terminals. The gain of any
stage may be increased by 20dB in 10dB steps by changing the internal gain straps.
To locate and reset these jumpers, refer to the parts layout for the location of JU1
and JU2. The lid of the unit must be removed to access these jumpers. Place a
shorting strap across the center and rear pin (pin towards the rear barrier strip) to
increase input gain by 10dB. Place a shorting strap across the center and forward
pinto increaseinput gainby 20dB.
Output level is factory set for unity gain. Each output can be individually set via its
front panel recessed level pot over a range from –60 to +18dBm. Nominal
operatinglevelsare0dBminputand+10dBmoutput. Higheroperatinglevelscan
cutdynamic range by operating tooclose totheclipping point. Adjust eachoutput
tothe desiredlevel, keeping clipping in mind.
Connections
The units are primarily designed for balanced inputs and outputs. The input ground
is connected to the chassis and power supply at a single point. If unbalanced lines
are used, tie the unused input terminal to ground. However, do not tie any unused
outputterminalstoground. Wireanunbalancedoutputbetweenoneoutput
terminal and the input ground terminal. For further details, see the section on
usingactivebalancedcircuitryin this manual.
Althoughthe outputs areshort circuit protected,operating into lessthan a 600ohm
load is not recommended. The input is bridging (high impedance) and will not load

Radio Systems, Inc. DA-2/4x4b Manual
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downanysource.
Because the unit is actually four separate 1 input x 4 output amplifiers, internal
jumpersJU3and JU4allow forthe followingconfigurations:
1input x 8 outputs (stereo)
4inputsx 4outputs(mono)
2inputs x 4outputs (stereo)
Additionally,bywiring the inputsinparallel, thefollowingconfiguration ispossible:
1inputx16output(mono)
Refer to the connection diagram on the following page for details.
AC line voltage is user selectable from the lid of the cabinet by inserting a thin
shafted screw driver through the vent holes to move the red line voltage selector
switch to the left for 230V operation, and to the right for 110V operation (factory
default).

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G
4D+ 4D- 3D+ 3D- 2D+ 2D- 1D+ 1D-
G
D Outputs
D+ D- G X X G C+ C-
Inputs
G
4C+ 4C- 3C+ 3C- 2C+ 2C- 1C+ 1C-
G
C Outputs
Connect straps
G
4B+ 4B- 3B+ 3B- 2B+ 2B- 1B+ 1B-
G
B Outputs
B+ B- G X X G A+ A-
Inputs
G
4A+ 4A- 3A+ 3A- 2A+ 2A- 1A+ 1A-
G
A Outputs
Connect straps
Mono
G
4D+ 4D- 3D+ 3D- 2D+ 2D- 1D+ 1D-
G
D Outputs
D+ D- G X X G C+ C-
Inputs
G
4C+ 4C- 3C+ 3C- 2C+ 2C- 1C+ 1C-
G
C Outputs
(No straps)
G
4B+ 4B- 3B+ 3B- 2B+ 2B- 1B+ 1B-
G
B Outputs
B+ B- G X X G A+ A-
Inputs
G
4A+ 4A- 3A+ 3A- 2A+ 2A- 1A+ 1A-
G
A Outputs
(No straps)
Left or Input 1 Right or Input 2
For use as a 1 input x 16 output (mono)
Left or Input 3 Right or Input 4
For use as a 4 input x 4 output (dual stereo or quad mono)
Note: The 2x4 (mono) version uses only the left-hand circuit board. Configure it as shown above for:  Illustration 1 - 1 input x 8 output (mono)  Illustration 3 - 2 input x 4 output (stereo)
G
4D+ 4D- 3D+ 3D- 2D+ 2D- 1D+ 1D-
G
D Outputs
D+ D- G X X G C+ C-
Inputs
G
4C+ 4C- 3C+ 3C- 2C+ 2C- 1C+ 1C-
G
C Outputs
Connect straps
G
4B+ 4B- 3B+ 3B- 2B+ 2B- 1B+ 1B-
G
B Outputs
B+ B- G X X G A+ A-
Inputs
G
4A+ 4A- 3A+ 3A- 2A+ 2A- 1A+ 1A-
G
A Outputs
Connect straps
Left Right
For use as a 2 input x 8 output (stereo)
Illustration 1 Illustration 3 Illustration 2

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Parts Layout Power Supply

Radio Systems, Inc. DA-2/4x4b Manual
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PartsLayoutAmplifier

Radio Systems, Inc. DA-2/4x4b Manual
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Parts List Power Supply
Part# Qty. Description ReferenceDesignation
16298 1 DA4X4BPOWERSUPPLYDETAIL
1026 2 CAP 15UF 35V C1;C6
10597 2 CAP4700UF 35V C2;C5
5744 2 CAP100UF25VRAD+/-20% C3;C7
5743 2 CAP.1UFFILM C4;C8
7012 8 DIODE1N4005 D1;D2;D3;D4;D5;D6;D7;D8
10489 1 FUSEHOLDER F1
10847 1 FUSE 0.3 AMP F1
10491 1 IECPOWERCONNECTOR J1
10490 1 SAMTEC8PINFRTHEADER J2
2831 1 RES 1K 1/2W 5% R5
9585 2 RES 237 OHM 1/4W 1% R2;R4
9582 2 RES2.61K 1/4W 1% R1;R3
10492 1 SWITCHPOWERDPDT110/220V SW1
10788 1 TRANSFORMERDATOROID T1
1076 1 VRLM337T U2
1077 1 VRLM317T U1
10683 1 LED3MMGREENHIGHCURRENT D9

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Parts List Amplifier
Part# Qty. Description ReferenceDesignation
16295 1 DA4X4BSMT DETAIL
16019 20 RES SMT 1.0K 1/8W 1% R1-R8;R53-60;R62;R63;R151;R155;R159;R163
16350 32 RES SMT 30.1 OHM 1/8W R9THRUR40
16074 8 RES SMT 20.0K OHM 1/8W R41;R42;R44;R44;R45;R47;R48;R50;R51
16022 4 RES SMT 221 OHM 1/8W 1 R61;R55;R58;R64
16351 83 RES SMT 5.11K OHM 1/8W R65-112;114-116;119-121;124-126;129-131;133-
135;137-139;141-143;145;147;198;199;
201;202;204;205;207;208;210;211;213
16351 21 RES SMT 5.11K OHM 1/8W R214;216;217;219;220;222;223;225;226;228;229;
231;232;234;235;237;238;240;241;243;244
16040 16 RES SMT 1.00M OHM 1/8W R169-174;R183-R186;R195;R196;R165-R168
14424 28 RES SMT 2.2K R177;R178;R187-R194;R179;R180;R128;R122;R123;
R113;R132;R117;R118;R127;R149;R153;
R157;R161;R181;R182;R175;R176
16021 4 RES SMT 100K 1/8W 1% R136;R148;R144
16352 8 RES SMT 3.32K OHM 1/8W R150;R152;R154;R156;R158;R160;R162;R164
16353 4 RES SMT 931 OHM 1/8W 1 R43;R46;R49;R52
16354 16 RES SMT 6.04K OHM 1/8W R221;R230;R218;R206;R233;R197;R227;R236;R215;
R224;R239;R209;R203;R242;R200;R212
16355 16 RES SMT 825 OHM 1/8W 1 R245-R260
16005 50 CAP SMT .1UF 50V CERM C1;C12;C15;C24;C35;C38;C47-C54;C95-C98;C115;
C116;C164;C178;C119-C124;C126-C133;C136-C143;
C166;C168;C170;C172;C174;C176
16151 12 CAP SMT 330PF 50V CERM C11;C13;C14;C103;C106;C109;C112;C33;
C34;C36;C37;C10
16346 48 CAP SMT 47PF 50V CERM C87-C94;C79-C85;C147-C162;C86;C180-C195
16347 36 CAP SMT .0022PF 50V CE C17;C19-C23;C4;C25-29;C43-C46;C7-C9;
C30-C32;C18;C99;C5;C100;C101;C6;
C39-C42;C102;C2;C3;C16
14750 32 CAP SMT 22UF 16V ELECT C55-C78;C104;C105;C107;C108;C110;C111;C114
14753 10 CAPACITORSMT100UF C117;C118;C125;C134;C135;C144-C146;C179;C196
16153 8 CAP SMT 100UF 50V ELEC C163;C165;C167;C169;C171;C173;C175;C177
10659 16 POTPIHERPT15LH06-103 R261-R276
16032 16 DIODESMTMMDB4148SOT D1-D16
16356 4 LEDSMTRED D17B;D18B;D19B;D20B
16357 4 LEDSMTGREEN D17A;D18A;D19A;D20A
16348 4 LIGHTPIPE3MMDUALTO D17;D18;D19;D20
16012 4 TRANSISTORSMTMMBT440 Q1;Q2;Q3;Q4
16349 4 IC SMT LM358 U13;U14;U15;U16
16063 28 ICSMTNE5532D U1-U12;U17-U32
11130 4 HEADER15PIN J1-J20
10484 1 HEADER8PINRIGHTANG J21
7903 4 HEADER2PINSINGLERO JU1;JU2;JU3;JU4
7770 4 HEADER3PINSINGLERO JU5;JU6;JU7;JU8
5758 8 JUMPERPLUG.1 JU1;JU2;JU3;JU4;JU5;JU6;JU7;JU8