Henry Engineering U.S.D.A. 2X4 Manual

Henry Engineering Modtager U.S.D.A. 2X4

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Side 1/2
HENRY ENGINEERING
503 Key Vista Drive
Sierra Madre, CA 91024
Tel: 626.355.3656
Fax: 626.355.0077
www.henr
y
en
.com
U.S.D.A. 2X4
TM
UTILITY SUMMING & DISTRIBUTION AMPLIFIER
DESCRIPTION
USDA 2X4 is a 2-in/4-out audio distribution amplifier that has the unique ability to combine as
well as "split" audio signals for distribution. The unit has two inputs (one stereo pair) and four
outputs (two stereo pairs). USDA 2X4 can be used as a 1X4 or 2X4 DA and can combine a
stereo input to a mono output(s) without degrading the separation of the stereo source signal.
All inputs are 20K bridging balanced; each output can drive a 600 ohm load to +26 dBm. An
output level adjustment is provided for each output channel. Overall gain is adjustable from -12
to +14 dB. Nominal input levels between -10 and +8 dBm are recommended. All USDA 2X4
circuitry is active and direct-coupled.
INSTALLATION
All audio connections are via the plug-in euroblocks. Remove about 1/8” of insulation, insert
wires into the plug, and tighten the screws. Be sure that no bare wiring is exposed.
Connect input signals to the USDA inputs, labeled "1" and "2". For unbalanced inputs, install a
jumper between the - input and GND. Single (mono) inputs may be fed to all 4 output channels
by connecting both 1 and 2 inputs in parallel. Connect output loads to USDA outputs, labeled 1
through 4. For unbalanced loads, connect to the + and GND terminals only. (Do not
connect
the - terminal to ground.) It is not necessary to terminate unused outputs.
OPERATION
The signal fed to input 1 will appear at outputs 1 and 3. The signal fed to input 2 will appear at
outputs 2 and 4. Hence, outputs 1 and 2 are a Left/Right stereo pair, as are 3 and 4. Each
stereo output pair has a STEREO-MONO SWITCH. If the switch is in the "S" position, a stereo
input will produce a stereo output. If the switch is in the "M" position, that output will be
combined to monaural. The two stereo outputs operate independently; switching one output
pair to MONO has no effect on the other pair, and does not degrade the separation of the stereo
input signal. Each output has a gain adjustment for setting output level. A maximum of +8dBm
(average) is recommended. Input levels should be between -10 and +8 dBm. For input levels
outside of this range, consult the factory.
SPECIFICATIONS
Input impedance 20K ohms balanced; 10K ohms unbalanced
Input levels -10 dBm to +8 dBm nominal
Gain -6 db to +15 db
S/N ratio 100 dB, ref +4 dBm output w/ unity gain
Output source Z 100 ohms balanced; 50 ohms unbalanced
Output load 600 ohms or more per output, X4
Output level +24 dBm max
Specifications subject to change without notice. P/N 3310 Rev. 6/04.
5 4 3
D
C
B
A
BLK SECPRI
15V
230V
AC
LEFT
RIGHT
INPUTS OUTPUTS
LEFT
RIGHT
+
+
-
-
-
+
-
+
1
2
1
2
GND
GND
GND
GND
+15V
-15V
+15V +15V
-15V
+15V
-15V
+15V
-15V
+15V
-15V
-15V
+15V
RP3D
2.2K DIP
4 13
C8
.1uF
+
C12
330uF 25V
+
-
U2B
NE5532
5
67
8 4
RP1F
2.2K DIP
6 11
RP2D
2.2K DIP
4 13
R13 47
E1
RP1B
2.2K DIP
2 15
R7 4.99K
C13 100pF
R15 47
TP2
1
SW1
2
1
3
RP3B
2.2K DIP 215
C3
.001uF
7
RP1C
2.2K DIP
3 14
LED1
LED
J1
1
2
3
4
5
6
+
-
U3B
NE5532
5
67
8 4
C2
.001uF
TP1
J2
1
2
3
4
5
6
RP3A
2.2K DIP
1 16
C5
.001uF
R22 47
R
2.2K
8
RP1A
2.2K DIP
116
C17
.1uF
RP3C
2.2K DIP
3 14
C7
.1uF
C1 100pF
+
-
U1B
NE5532
5
67
8 4
RP1D
2.2K DIP
413
RP2A
2.2K DIP
1 16
+
-
U3A
NE5532
3
21
8 4
RP2C
2.2K DIP
3 14
R6 4.99K
C19
.1uF
D2
1N4004
C6 .001uF
E6F1
115V: 250 ma; 230V: 125ma
1
3
2
5
6
7
R38
25K, POT
1 3
2
R3 4.99K
R1 4.99K
C15
.1uF
RP1E
2.2K DIP
5 12
R20 47
D4
1N4004
R41
3.9K, 5%
+
-
U1A
NE5532
3
21
8 4
C4
.001uF
C14 .001uF
Q1 LM7815
3
2
1
IN
GND
OUT
D1
1N4004
E7
+
-
U2A
NE5532
3
21
8 4
R37
25K, POT
1 3
2
RP2B
2.2K DIP 215

Produkt Specifikationer

Mærke: Henry Engineering
Kategori: Modtager
Model: U.S.D.A. 2X4

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