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The Jensen Transformers ISO-MAX VBH-3RR is a
commercial-quality high-bandwidth ground loop isolator
that can reduce
ground current-induced interference by a factor of over
100. With bandwidth that extends from DC to 600MHz and
super-low 0.05 dB insertion loss, you can expect
excellent picture quality, free of the visible effects
of video interference, such as hum bars.
Also available with BNC connectors as model VBH-3BB.
This series is also available in a 5-channel version,
model VBH-5BB, which is suitable for R/G/B/H/V video
with a bandwidth of up to 900 MHz!
Ground Loops?
(or why the best planned systems sometimes look and sound bad)
It is a subject that is seldom discussed in manufacturers publications, or even in magazines of the trade, but ground loops can happen even in the most carefully planned A/V system. When ground loops happen in a video system, the result is unwanted hum or video hum bars.
For example, in front projection systems, the power
supply for the source components are are typically powered by a
different electrical branch circuit than the projector.
When devices in the same system are powered by
separate branch circuits, that can cause a difference in
ground potential between the two pieces of equipment. It
can be because one of the circuits is loaded more
heavily than the other, or because one run is longer
than the other, or any number of other reasons that are
beyond the scope of this article, but the result of this
difference in ground potential is commonly referred to
as a ground loop. Ground loops manifest themselves as
"hum bars" and other visible artifacts in video systems.
Quite often, these hum bars will appear crawl slowly up
(or down) the screen as. To make matter worse, it
is not uncommon for video ground loops to cause hum and
noise in connected audio gear in the same system.
The Solution
The Jensen Transformers VBH-3RR is elegant in its simplicity. In the example
above one would simply insert the VBH-3RR anywhere in the
video path between the source and the projector.
Immediately, the effects of the ground loop become a non-issue. Problem solved. There are not too many things that one can install in a
video system that can provide so much improvement with so little effort.
Jensen Transformers' Description
VIDEO GROUND LOOP CORRECTOR
FOR 75 Ohm SYSTEMS
- Provides 56dB Reduction in Ground Loops
- DC to 600MHz Bandwidth for VBH-3RR (also
available in BNC as VBH-3BB)
- DC to 900MHz Bandwidth for VBH-5BB
- Low VSWR Prevents Signal Degradation
- Low Insertion Loss for High S/N Ratio
- Channels may be used independently
The ISO-MAX® VBH-3RR reduces ground current
induced video interference such as "hum bars" by
a factor of over 100, eliminating the visible
effects of these types of interference. The high
bandwidth and low VSWR prevent degradation of
the picture quality due to high frequency
roll-off and cable reflections.
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