The HEC-2000 eliminates hum and greatly reduces interferences in video lines caused by differences in ground potential. Features flat response, bandwidth up to 30 MHz, four color or monochrome, no low frequency or high frequency roll off, passive device, failure free, use on 50 Hz or 60 Hz systems. Applications in field: between remote truck and Telco, between remote truck and microwave, for VTR units. In Studio: between buildings, installations with long cable runs, between studio and transmitter. Comes in aluminum die cast box. Preferred by America's leading broadcasters. HEC-2000 Specifications HEC-2000 Hum Eliminator should be used for the most severe hum problems. Hum reduction of over 60 dB even on 50 Hz systems.
The HEC-2000-V now joins the line of single-channel Hum Eliminators manufactured by Allen Avionics. Like the HEC-2000 and the HEC-2000-H, the HEC-2000-V stops all 50 Hz and 60 Hz hum. The HEC-2000 Series is designed to eliminate hum in video applications caused by long cable runs or ground loops.
This new edition is a heavy-duty version, like the HEC-2000-H, and features 1/4" thick, stainless steel guard rails to protect the connectors when not in use.
With the addition of the HEC-2000-V to the HEC-2000-H, the end user has a choice of connector location and protection, plus the performance of the standard HEC-2000. The HEC-2000-H is designed for optional rack mounting installation. (see below)
The HEC series works in circumstances where interference is caused by small differences in ground potential (less than 20 volts) or by induced currents in long cable runs. When there are multiple power panels in a building, or even a single floor, equipment and lighting loads resut in small differences in potential which induce a ground loop current flow and 60 Hz hum. (see Figure 1)
Electronically-induced current flows in long cable runs also create hum. For 50 Hz and 60 Hz power systems, and where induced currents are high, the HEC-2000, HEC-2000-H and HEC-2000-V increase the attenuation at the power frequency.
Should a small amount of hum remain after an HEC has been added to the circuit, a second HEC can be added in series, without significant degradation of the video signal..