VBH-3BB 75 Ω composite video isolator

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The Iso•Max VBH-3BB is a three channel 75 Ω video isolator for component video that is used to prevent 60 cycle ‘hum bars’ even where ground voltage differences can be very large such as in ceiling mounted projectors in house of worship, conferences centers and night clubs.

  • Eliminates hum bars caused by ground loops
  • Exceptional performance, will not deteriorate picture quality
  • Very high ground isolation: 120 dB CMMR typ at 60 Hz
  • Precise impedance matching ensures minimal reflection

Designed for use with standard RG59 type coaxial cable, the VBH-3BB combines true 75 Ω BNC connectors with a unique humbucking circuit to deliver an exceptionally linear bandwidth from DC to 900 MHz with virtually zero insertion loss, contamination or artifact. Plug and play easy to use, the VBH-3BB features a flanged, electrically isolated housing that is easily mounted on standard 19” rack rails or inside a NEMA enclosure. One simply connects the passive device in series and problems such as ground loops are eliminated, reducing noise by as much as 56 dB at 60 Hz.

The VBH-3BB is a tremendous time saver as it eliminates excessive trouble-shooting when hunting down sporadic problems. Once installed, it often eliminates future service calls that can be attributed to non-related voltage fluctuations caused by cycling refrigeration systems, power transformers or nearby industrial facilities that may be causing power disruptions.


VBH-3BB with a projector

Often the projector is mounted in the ceiling, where separate circuits supply the projector and the source video player. Isolating the transmission line with the VBH-3BB helps eliminate hum bars and improves the picture quality.

VBH-3BB in a live show

Today, live shows often combine video backdrops and screen projections to the action on stage. The challenge is keeping the video feed clean when the various equipment that surrounds it may be ‘polluted’ by motors, dimmers, and power transformers. Isolating the video system with the VBH-3BB solves the problem.

VBH-3BB with component video

There are still many installed systems that employ component video to distribute the signal. In these installations, hub bars can often appear when certain equipment is activated such as refrigeration systems, air conditioning, motors, or dimmers. One merely inserts the VBH-3BB into the signal path to prevent signal degradation.


(source Z - load Z - 75 Ohms, signal level = 1Vpp unless otherwise noted, specifications apply to all 3 independent channels)

Input impedance, Zi 10 kHz, test circuit 1   75 Ω  
Insertion loss 10 kHz, test circuit 1 (referred to -6.02 dB)   -0.05 dB -0.10 dB
High Frequency Response, ref 10 kHz 100 kHz, test circuit 1 (referred to -6.02 dB)   -0.005 dB  
High Frequency Response, ref 10 kHz 1 MHz, test circuit 1 (referred to -6.02 dB)   -0.005 dB  
High Frequency Response, ref 10 kHz 3.58 MHz, test circuit 1 (referred to -6.02 dB)   -0.10 dB  
High Frequency Response, ref 10 kHz 10 MHz, test circuit 1 (referred to -6.02 dB)   -0.20 dB  
High Frequency Response, ref 10 kHz 100 MHz, test circuit 1 (referred to -6.02 dB) -1.00 dB -0.80 dB  
Low Frequency Response Ratio test circuit 1   DC  
Common – mode rejection ratio 60 Hz, test circuit 2, no cable 50 dB 56 dB  
Common – mode rejection ratio 60 Hz, test circuit 2, with 100 feet (30.5 m) of RG-59/U cable at input   48 dB  
Maximum common-mode voltage 60 Hz, test circuit 3, 3% THD 1.4 Vpeak 1.7 Vpeak  
Inductance 60 Hz, 500mVrms, shield, input to output   200 mH  
DC resistances center conductor, input to output   0.70 Ω  
DC resistances shield, input to output   0.20 Ω  
Capacitances center conductor to shield   200 pF  
Time Delay Skew between channels     0.1 nS 0.5nS
Weight     4 lbs. (0.45 kg)  
Temperature range operation or storage 0°C   70°C


60 Hz Common-mode Feedthrough vs. Common-mode Voltage
Common-mode Feedthrough vs. Frequency with 1V peak Common-mode Signal
Amplitude Response (dB) vs. Frequency (Hz)
Reflection Coefficient (dB) and VSWR vs. Frequency (Hz)

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