Click to enlargeFM Systems GB-60UTP<br>Ground Loop Blocker

The GB-60 UTP Ground-Loop Blocker for Twisted Pair wire is an active device used in conjunction with any Unshielded Twisted Pair video transmitter or "Balun" to eliminate Ground Loop Interference and picture quality problems in new and existing twisted wire CCTV video installations. The unit is installed at the monitor site where the video twisted pair signals come together, or at any intermediate point where video signals are monitored. The GB-60 UTP 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 twisted pair wire CCTV system.

The Level control can be adjusted to overcome losses due to long wire runs up to 3000 feet, small wire gage or quality, and improper camera source terminations.

The Picture Sharpness control can be used to restore Picture quality to its original sharpness due to long wire runs, poor quality twisted pair wire or wire used in wet locations in twisted pair "Balun" transmission installations. It will also restore the video color-burst on a color camera to improve color camera operation on long wire 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 75 Ohm "BNC" connector 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 signal.

By installing the GB-60 UTP 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 UTP 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.

Level: 1 Vpp, 140 I.R.E. Units
Impedance: 100 Ohms Balanced
Video Standard: CCTV, NTSC, PAL
Connectors: Screw Terminal
Video Channels: 4 Channels (A-D)
Power Requirements: 24 VDC Wall Mount (Supplied)
Power Connector: 5.5mm x 2.5mm

Clamping: Tip of SYNC
Common Mode Rejection: 40 dB Typ.
Video Gain: -2 to +3 dB
High Frequency Compensation: 0 to +10 dB
RF Bandwidth: 30 MHz

Level: 1 Vpp, 140 I.R.E. Units
Impedance: 75 Ohms
Connectors: BNC (Female)
Channels: 4 Channels (A-D)
Distribution Out (Optional): 4 Channels (E-H)
Signal to Noise Ratio: 70dB

Size: 5.5" L x 4.3"W x 2"D
Temperature Range: 0 - 50 Degrees Centigrade
Humidity: 95% Non-Condensing

Power supply included.


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