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Website Position: Homepage Products Video Coax Cable Balun Transformer Filter, Video Noise Filter, CAT5 Video Noise Filter

BALUN Transceiver Product Catalog (PDF Download)

What is a ground loop?
A ground loop is usually found between equipment using standard 120 VAC power that is connected to more equipment using standard 120 VAC power.
This connection is usually audio cables and/or video cables and/or CATV cables.
Your hum problem may be originating amongst your Camera, Receiver, TV, DVR, VCR, CATV, Audio System etc.
Ground loops are often found on longer runs of cable or between equipment using separated 120 VAC outlets.
Please note a hum may originate up stream and will be propagated down stream to the last component.
Your typical stream might be a camera connected to a wireless device connected to a video amplifier connected to a switcher connected to a recorder connected to a monitor or TV.
A filter will not remove the hum once it is in the system. The filter will only work at the source of the problem.
If the ground loop problem starts between the camera and the wireless device then no filter connected to the TV will help.
In this example disconnecting the cable from the recorder to the TV will make the hum disappear but it is not the source of the problem. In this example you can test the connection between the camera and the wireless device by using an alternate source of video or moving the camera and the wireless device to a new location or connecting the power to other locations etc.

One simple test is;
Step one, disconnect an audio, video or CATV cable and see the problem clear up.
Step two, momentarily touch the outer body of one connector to the outer body of the other connector.
Do not let the center conductors touch each other or the outer body of either connector.
If the problem returns it is a good indication that this is at least one point in the loop.
Installing a filter at this point may help solve your hum problem.

Can you do some tests to your system?
The approach is to monitor the hum as you make changes to your system.
You should do the simple test above on all the wires necessary.
You will try to disconnect wires one at a time (and in most cases reconnect them) until you find a change in the hum level.
Ground loop problems are one of the toughest problems to correct.
Good luck and work safely.

Specification

• Video horizontal & vertical SYNC signals not balanced would cause picture 'up-rolling' that happened on weak, strong differential signal into DVR, monitor or video image processing equipments.
  Other case like under long range cabling cause 'Impedance not Matching'. The video transformer filter is designed with multi- stage high common mode noise and jamming rejection, video termination and video filtering circuits for most of high noise environment.
  
  For Coaxial cabling transmission CCTV application, using HT7000TFLT _HT7001TFLT_HT7000TFLT-S and HT7000TFLT-SS ( Coax and CAT6 BALUN Filter) for extra interference rejection.

Specification

• BNC male to BNC female with 165mm mini cable 15 on both sides
• Perfect work with DVR/monitor to immunity DVR/monitor interference
• Built in a highly balanced commond mode noise rejection of video transformer
• Built in ground loop different DC level blocking circuit - UST1101TFH
• video line termination and LPF video filter block circuits for 'Hum Bar' rejection, which are immune to interference from these, and other sources of noise: Data signals, other video signals, nearby power, ringing telephones, fluorescent lights, transformers, and more...

Product Information & Application Diagram