MODEL # DCB101 AUDIO/VIDEO AMPLIFIER 5 Channel DC Isolation Unit Component DC Isolation Unit eliminates DC ofsets in the video or audio that can cause hum bar interference. • • • • • • • KEY FEATURES Easy to use HDTV module Compatible with HD distribution amplifieres Eliminates annoying hum bars Up to three video channels may be used for three individual composite video signals if desired • SPECIFICATIONS Function: – Connectors: – Channels: – Video Bandwidth: – Audio Bandwidth: – Dimensions: – Mounting Holes: 5 RCA in, 5 RCA out 3 Video 2 Audio >300 MHz 20Hz to >100kHz 1.25” x 3.9” x 1.5” (2.3 including mounting tab) 1.8” spacing, 0.15” diameter HD Monitor or Projector HD Distribution Amplifier Note: The three video channels may be used for three individual composite video signals if desired. HD SOURCE Breaking the DC path between the Video Source and the Distribution Amplifier can sometimes eliminate annoying hum bars. • Causes: – If you are seeing a green (blue, grey, etc.) bar that is slowly floating up through the picture, you are experiencing a video hum bar. – If the source electrical power is too low, the video devices may have a problem regulating their power supplies. This issue can be compounded by sources that output DC offsets that place additional loads on the video distribution system. – A second source of the problem is differential ground voltage potentials, which cause AC power to flow through the video cable grounds. This is commonly referred to as a “Ground Loop.” – The hum in the system might also be induced into the video cabeling by being routed too closely to an AC power cable. 10 • PRO TIP: VIDEO HUM BARS Remedies: 1. The signal and AC power cables should never be bundled together. 2. Have a qualified electrician find and repair any defective AC outlets that may be causing AC Ground Loop currents. 3. Use a distribution amplifier with isolated input grounds in order to break the Ground Loop. 4. If the video source has DC voltage on the video output, inserting a DC voltage blocker in line can eliminate problems in the distribution network.
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