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Wide Bandwidth Ground Loop Eliminators
Supports SDI transmission rates from 143Mbps to 540Mbps including 270Mbps (SMPTE 259M) 


Allen Avionics has developed a family of Wide Bandwidth Ground Loop Hum Eliminators. These products will satisfy the broadcast industry's need for wide bandwidth components for use in high definition video applications, high speed video switching systems, high resolution or high definition video display and projection systems and for all wide bandwidth analog and digital transmission applications. These Hum Eliminators provide a high degree of common mode rejection at power frequencies (50Hz, 60Hz and 400Hz) while passing all frequencies from DC to over 300 MHz for the GLE-50 and GLE-75 and DC to over 500MHz for the GLE-50-VHF, GLE-75-VHF and GLE-75-VHF-5 series.

Now Available as Rack mounted GLE-75-VHF-5 Rack

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  • Bandwidths up to 500 MHz
  • Low Signal Loss
  • No Differential Gain or Phase Distortion
  • Passive Device, Failure-Free
  • Easy to Use
  • Multi-channel Versions for RGB/YUV/Componen

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Differences in ground potentials, unbalanced power loads and large multi-wire and multi-cable video or serial data distribution systems using coaxial cable can form ground loops and become a receptor for unwanted energy. This unwanted energy results in common mode currents flowing in ground loops.
See Figure 1 above.

Any of the GLE Series of high frequency hum eliminators will protect all high-speed video or data coaxial distribution systems from ground loops and electromagnetic interference caused by power line and interfering RF sources. Common mode currents present in shielded cable transmissions systems are removed by providing an effective reduction (50 to 60 dB) of CMV (Common Mode Voltage) at power frequencies (50Hz, 60Hz and 400Hz).

The GLE Series of hum eliminators is ideally suited for use with wide bandwidth, high resolution video projection systems that require bandwidths of 350 MHz or more. Modem, high-speed serial video routers, data switching or distribution systems or any high-speed analog or digital networks that employ high frequency video, serial data or high frequency control signals will benefit from the use of a wide bandwidth hum eliminator. See Figure 2 below.

All of the GLE Series of hum eliminators are available in single and multi-channel versions, including 5-channel models (GLE-50-5 and GLE-75-5) and (GLE-50-VHF-5 or GLE-75-VHF-5), specifically designed for video projection systems. "Heavy Duty" versions of the single-channel GLE series are also available. The Heavy Duty models (GLE-50-H, GLE-75-H, GLE-50-VHF-H or GLE-75-VHF-H) (H for Heavy duty) feature 1/4" guard rails to protect the BNC connectors. Jack covers are supplied on the single-channel, heavy duty units to protect the BNC connectors when not in use. All multi-channel models are supplied with guard rails.

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Model GLE Series Model GLE-VHF Series Model GLE-VHF-5 Series
Impedance: 50 Ohms GLE-50 &
GLE-50-VHF &
Impedance: 75 Ohms GLE-75 &
GLE-75-VHF &
Bandwidth: 300 MHz, minimum 500 MHz, minimum 500 MHz, minimum
Common Mode Rejection: > 60 dB at (50Hz, 60Hz) > 60 dB at (50, 60 & 400 Hz) > 60 dB at (50, 60 & 400 Hz)
Rise Time: 1.80 Nanoseconds 0.72 Nanoseconds 0.72 Nanoseconds
Frequency Response: 1.5 dB @ 150 MHz
2.0 dB @ 250 MHz
3.0 dB @ 300 MHz
1.5 dB @ 200 MHz
2.0 dB @ 300 MHz
3.0 dB @ 500 MHz
1.5 dB @ 200 MHz
2.0 dB @ 300 MHz
3.0 dB @ 500 MHz
Reference Frequency: 100 KHz 100 KHz 100 KHz
Insertion Loss: 0.4 dB, maximum 0.2 dB, maximum 0.2 dB, maximum
Number of Channels: 1 or 5 1 5
Package: Die-cast metal case Die-cast metal case Aluminum case
Size: 4-11/16" x 3-11/16" x 2-1/16" 4-11/16" x 3-11/16" x 2-1/16" 8-1/2" x 3-1/2" x 4"
Size GLE-75-5
4-3/4" x 3-1/16" x 7-7/16"

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Allen Avionics, Inc.
2727 Clinton Street
River Grove, IL  60171
Phone: (708)-453-3238
Fax: (708)-453-0297
E-Mail: Sales@AllenAvionics.com

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