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KRAMER ELECTRONICS LTD.
There are two major ways to synchronize sources. The first is to use an expensive device called a frame
synchronizer. A frame synchronizer is a digital video device which synchronizes a video source (sync and
color) to an external reference or to another video source. The second way is to use Genlockable devices in the
studio which allow syncronization of the sync and color to an external source.
The source may be a full video signal or a Black Burst signal. The black burst reference signal, commonly used
in video production and production studios, is a video signal showing a clean, black screen, hence the name
Black Burst. The Black Burst signal is comprised of sync signals (hori vertical), the color burst signal
at the beginning of the video lines and a zero level video signal – a black screen.
A Black Burst generator supplies several parallel black burst outputs and can therefore simultaneously genlock
several video sources in a studio. A Black Burst generator can sometimes Genlock itself to an external video
source, providing black burst outputs genlocked to the incoming reference.
FACTORS AFFECTING QUALITY OF RESULTS
There are many factors affecting the quality of results when signals are transmitted from a source to an acceptor:
Connection cables - Low quality cables are susceptible to interference; they degrade signal quality due
to poor matching and cause elevated noise levels. They should therefore be of the best quality.
Sockets and connectors of the sources and acceptors - So often ignored, they should be of highest
quality, since "Zero Ohm" connection resistance is the objective. Sockets and connectors also must
match the required impedance (75ohm in video). Cheap, low quality connectors tend to rust, thus causing
breaks in the signal path.
Amplifying circuitry - Must have quality performance when the desired result is high linearity, low
distortion and low noise operation.
Distance between sources and acceptors - Plays a major role in the final result. For long distances
(over 15 meters) between sources and acceptors, special measures should be taken in order to avoid cable
losses. These include using higher quality cables or adding line amplifiers.
Interference from neighboring electrical appliances - These can have an adverse effect on signal
quality. Balanced audio lines are less prone to interference, but unbalanced audio should be installed far
from any mains power cables, electric motors, transmitters, etc. even when the cables are shielded.
SPECIFICATIONS
SG-6005
FUNCTION
Genlock Multistandard Black Burst / Color Bar Generator
INPUTS
1 composite video, looping, 1Vpp /75 , on BNCs with a termination switch.
OUTPUTS
6 black burst signals, 0.3 Vpp/75 , (sync) 1 color bar output 1Vpp/75 , 2x 1kHz,
+4dBm/47 outputs on XLRs, 2x 1kHz, 1Vpp/100 outputs, on RCAs.
COLOR BAR
13 selectable patterns.
CONTROLS
H control: 1 Line, 37 nS steps; V control: 4 lines, ½ line steps.
SCH control: 360 Degrees, by front touch switches. RS-232 control and software
update.
PHASE ERROR
Less than 1 degree
SYNC OSCILLATOR
Crystal controlled.
SC OSCILLATOR
Crystal controlled.
SYNC/SC
Fully Genlocked
STABILITY
Better than 5 PPM
ACCESSORIES
Power cord, Windows 95/98 control software, Null modem Adapter
DIMENSIONS
48.3(W) x 17.8(D) x 4.5(H) cm. / 19 inch (W), 7 inch (D), 1U (H) rack mountable
WEIGHT
2.5 Kg. (5.5 Lbs.) Approx.
POWER SOURCE
230 VAC, 50/60 Hz, (115VAC, U.S.A.) 10 VA.
