Inday SVDA-1 User manual

Overview And Uses
SVDA-1
S-Video
Distribution
Amplifier
Phone: [phone]
Fax: [phone]
Email: [email protected]
INDAY
1818 NE 140th
Portland, Oregon 97230
For Customer Service:
The SVDA-1 is a 4 output S-Video distribution
amplifier designed for the Broadcast, Video Pro-
duction and Multimedia environments. Its most
common application will be to distribute the output
of a VCR or other S-Video source to Switchers,
Routers, Monitors and other VCR's while main-
taining picture quality.
Often times the output of a VCR or Computer
Based Editing system has only One S-Video con-
nector. This can be quite limiting if you need to
make multiple dubs of a finished project or you
need to monitor the quality of the signal BEFORE
it passes through another VCR or piece of process-
ing equipment. Figure 1 shows a typical applica-
tion that overcomes these problems.
S-Video is a much cleaner way to distribute Video
signals. Its component nature reduces the interfer-
ence and distortion that is often seen in NTSC
Video. The longer you can keep a Video signal in
its component format the cleaner the end product
will look. Although the SVDA-1 cannot make
"Poor" video look any better, it will not add any
noise or distortion to it.
Installation
The SVDA-1 comes shipped ready to use. The
proper Wall Transformer is supplied. Simply con-
nect your source to the SVDA-1 input and connect
outputs as needed. Under most circumstances no
gain adjustment should be required. The unit is
shipped with gain set for unity. A 1Vp-p input will
produce 4-1Vp-p outputs. However if your Input
level is low or the outputs are driving long (>200
ft.) cables, the Y and C gain may need to be ad-
justed. See the next section for alignment proce-
dures.
Y/C Delay Notes
Y/C Delay is the leading or lagging of the Chroma
signal in time, referenced to the Luminance signal.
The SVDA-1 has no provision to correct this error.
Delays less then 100ns usually do not cause prob-
lems. If there is a gross delay error, a Delay Line
must be inserted in either the Y or the C signal
path. The delay line can be just a piece of Coax
cable or a Delay Box with switches. The Delay
Box should be capable of at least 300ns. If Coax is
used remember that 1ns equals 0.648-ft. (7.778") of
cable. For example, a Chroma delay of 281ns can
be corrected by inserting 182 ft. of coax in the Y
signal path.
Figure 1
Figure 2
INDAY
Multimedia Accessories
INDAY
Multimedia Accessories

Alignment
If critical level adjustment becomes necessary
you will need a Y/C Test Generator, such as a
Tektronix TSG 120, a Dual channel Oscilloscope
and an S-Video to BNC adapter. If these are not
available, accurate level settings cannot be made.
In most cases the gain controls should be keep
around the 10 o'clock position. This assumes a
1V p-p input. If you have the necessary test
equipment proceed as follows:
1- Connect Y to Oscilloscope CH-1
2- Connect C to Oscilloscope CH-2
3- Terminate both channels with 75 ohms
4- Adjust Y for 1Vp-p using Color Bars or
Pulse & Bar
5- Put Oscilloscope in Dual Add mode
6- Adjust C level to match the Color Bars
White Flag -or- Adjust C level using a
Pulse & Bar signal by flattening out the
bottom of the 12.5T pulse.
See Figure 3.
Figure 3
Specifications
INPUT:
4-pin mini Din (SVHS)
Y-channel 1Vp-p terminated
C-channel .8Vp-p terminated
OUTPUT:
Four 4-pin mini Din
Y-channel 1Vp-p *
C-channel .8Vp-p *
Impedance 75 ohms
Noise > 60dB below 1Vp-p
Frequency Response DC - 10Mhz +/-.3dB
Y/C delay < 2ns
GAIN:*
-4.5dB to +3dB both Y & C
.6V p-p to 1.4V p-p Y-channel
.45V p-p to 1.05Vp-p C-channel
POWER:
12VDC (18VDC Max) @ 200ma Max.
Wall Transformer supplied
DIMENSION:
4"W x 5"L x 7/8"H
TEMPERATURE
0 TO 50 DEGREES C
HUMIDITY
0 TO 90% (non-condensing)
R12
4.7K
R11
4.7K
C5
470uf
R1
4.7K R2
4.7K
3.3K
R5
10uf
C26
10uf
C25
100uf
C24
10uf
C30
C28 .1uf C27 .1uf C31 .1uf
CN5:B
4
CN4:B
4
CN3:B
4
CN2:B
4
.01uf
C22
.01uf
C20
.01uf
C18
.01uf
C11
R15
330
RV2
1K
W
C
W
R22
150 150
R9
C13
.01uf
75
R19
CN1:B 4
1K
R24
75
R21
R14
75
R18
1K
U4:B
MC14576A
7
+
5
-
6
U4:A
-
2
+
3
4
8
1
U5:A 1
8
4
+
3
-
2
MC14576A
U5:B
-
6
+
5
7
1K
R26
75
R25
R27
75
R28
1K
CN5:A
3
CN4:A
3
1000uf
C16
1K
R23
75
R20
R13
75
R17
1K
U3:B
MC14576A
7
+
5
-
6
U3:A
-
2
+
3
4
8
1C9
1000uf
1000uf
C2
U1:A 1
8
4
+
3
-
2
MC14576A
U1:B
-
6
+
5
7
1K R6
75
R3
R8
75
R10
1K
C7
1000uf
CN2:A
3
CN3:A
3
470uf
C6
C1
470uf
C8
470uf
470uf
C15
1K
RV1
C
W
W
330
R4
CN1:A 3
R7
75
1000uf
C4
100uf
C29
U2:B
-
6
+
5
7
MC14576A
U2:A
-
2
+
3
4
8
1
3.3K
R16
AN7809
U6
VI
1G
2
VO 3
2.0
R29
CN6:1 1
CN6:2 2
1N4001
D1
C14
.01uf C10
.01uf
C17
.01uf
C19
.01uf
C21
.01uf
AN7810
S-VIDEO DA Rev.A
MIKE CURTIN
1
12VDC
S-DA-2A.S01
1-24-94
VIDEO BUFFER MC14576A
INDAY-VIDEO BUFFER UNIPOLAR
INPUT LUMINANCE BUFFER
INPUT CHROMINANCE BUFFER
CHROMINANCE GAIN LUMINANCE GAIN
LUMINANCE OUTPUT DRIVERS
CHROMINANCE OUTPUT DRIVERS
+9
+9
+9
+9
+9
+9
+9
+9
+9
+9
AB C D E F
4
3
2
1
FEDCBA
1
2
3
4INDAY
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Disclaimer
This manual has been checked for accuracy. Inday
assumes no liability for damages incurred directly or
indirectly from errors or omissions or from the use
and suitability of this product for a particular applica-
tion.