The GB-60 Ground-Loop Blocker is an active device used to
eliminate Ground Loop Interference and picture quality problems
in new and existing CCTV video installations. The unit is
installed at the monitor site where the CCTV signals come
together, or at any intermediate point where video signals
are monitored. The GB-60 operates with any standard CCTV,
NTSC or PAL video signal.
This device controls and corrects four channels of CCTV video,
each channel is separately adjustable for Video Level and Picture
Sharpness. A built-in active ground loop blocker removes the 60
Cycle Bars from the CCTV signal even after they have become part
of the video signal. This ground loop isolator will prevent 60
Cycle "Hum Bars" from degrading your CCTV system at time of
installation and beyond.
The Level control can be adjusted to overcome losses due to long
cable runs up to 3000 feet, poor cable quality, and improper
video terminations. Cable runs can be extended beyond 3000 feet
by placing additional GB-60s at intermediate locations.
The Picture Sharpness control can be used to restore Picture
quality to its original sharpness due to long cable runs, poor
quality coaxial cable, kinked or damaged coaxial cable or twisted
pair "Balun" transmission installations. It will also restore
the video color-burst on a color camera to improve color camera
operation on long cable runs.
This device will prevent Ghosting in the picture by absorbing
and eliminating the reflected video Ghost signal. It will also
restore the Characteristic Impedance of the down stream video
signal to prevent secondary Ghosting in the picture.
An optional secondary video distribution output can be ordered.
This lets the installer add an extra monitor point or drive
any other video equipment without affecting the original video
By installing the GB-60 in your existing CCTV system you can
avoid the many hours of troubleshooting and trial/error
associated with problem installations. For some installations
you will find it advantageous to install a GB-60 on each group
of four channels. It is especially useful in installations
requiring lightning protection. Lightening protection devices
often induce 60 cycle bars into the video signal because they
use a connection to ground that does not equal the video ground
at the monitor point.
Power supply included.