UK Sales: 0191 418 1122         International: +44 191 418 1133

Menu

www.canford.co.uk

3 February 2025

ALLEN AVIONICS ANALOGUE VIDEO GROUND LOOP HUM ELIMINATORS AND ISOLATORS

9 items
ALLEN AVIONICS HEC-2000-H ANALOGUE VIDEO GROUND LOOP HUM ELIMINATOR 1 channel
ALLEN AVIONICS HEC-2000-H ANALOGUE VIDEO GROUND LOOP HUM ELIMINATOR 1 channelALLEN AVIONICS HEC-2000-V ANALOGUE VIDEO GROUND LOOP HUM ELIMINATOR 1 channelALLEN AVIONICS HEC-3000 ANALOGUE VIDEO GROUND LOOP HUM ELIMINATOR 3 channelALLEN AVIONICS HEC-4000 ANALOGUE VIDEO GROUND LOOP HUM ELIMINATOR 3 channel plus sync isolatorALLEN AVIONICS HEC-5000 ANALOGUE VIDEO GROUND LOOP HUM ELIMINATOR 5 channelALLEN AVIONICS VIT-75 ANALOGUE VIDEO ISOLATION TRANSFORMER 1 channelALLEN AVIONICS VIT-75-3 ANALOGUE VIDEO ISOLATION TRANSFORMER 3 channelALLEN AVIONICS SDI-VIT-75 SD VIDEO ISOLATION TRANSFORMERALLEN AVIONICS HD-VIT-75 HD VIDEO ISOLATION TRANSFORMER

A hum eliminator or isolation transformer can be inserted at points within an installation at which it is observed that performance degrades. Applications include sports stadiums and large arenas where it is very difficult to know where different earth potentials exist. Identification of the problem areas is undertaken by simplifying the circuits as much as possible, until satisfactory performance is obtained, and then re-introducing additional elements until the offending equipment is found which will indicate where a loop eliminator should be inserted.

Hum is the term for low-frequency noise induced by alternating currents at 50Hz or 60Hz in AC mains power lines. There are two main sources of hum and two types of hum-elimination available from Allen Avionics. Hum can appear on video signals because it has been induced in a ground-loop, or introduced because of a real voltage potential difference (p.d.) between the grounds on the transmitting and receiving equipment. In many installations, equipment racks are powered, unavoidably, from different supplies. This can easily lead to induced hum on video signals. These effects are often seen where signals are fed from floor to floor within buildings and can be very significant when they are passed from building to building. Probably the worst environment is the outside broadcast where multiple generators or AC power cables may be in close proximity to the equipment racks or video cables, inducing tens of volts of ripple on the coaxial cable screens.

Video Hum Eliminators - Analogue

Video Isolation Transformers

Description Price $
ex. VAT
Add to basket
Delivery
ALLEN AVIONICS HEC-2000-H ANALOGUE VIDEO GROUND LOOP HUM ELIMINATOR 1 channel Stock code: 90-6311
Ordered on demand, cancellations may incur charges, available in 1‑2 weeks. Need it sooner? Call us
$180.32
ALLEN AVIONICS HEC-2000-V ANALOGUE VIDEO GROUND LOOP HUM ELIMINATOR 1 channel Stock code: 90-6312
Ordered on demand, available in 1‑2 weeks. Need it sooner? Call us
$193.86
ALLEN AVIONICS HEC-3000 ANALOGUE VIDEO GROUND LOOP HUM ELIMINATOR 3 channel Stock code: 90-6313
Ordered on demand, cancellations may incur charges, available in 1‑2 weeks. Need it sooner? Call us
$535.09
ALLEN AVIONICS HEC-4000 ANALOGUE VIDEO GROUND LOOP HUM ELIMINATOR 3 channel plus sync isolator Stock code: 90-6314
Ordered on demand, cancellations may incur charges, available in 1‑2 weeks. Need it sooner? Call us
$702.72
ALLEN AVIONICS HEC-5000 ANALOGUE VIDEO GROUND LOOP HUM ELIMINATOR 5 channel Stock code: 90-6315
Ordered on demand, cancellations may incur charges, available in 1‑2 weeks. Need it sooner? Call us
$803.98
ALLEN AVIONICS VIT-75 ANALOGUE VIDEO ISOLATION TRANSFORMER 1 channel Stock code: 90-6316
Ordered on demand, cancellations may incur charges, available in 2‑3 weeks. Need it sooner? Call us
$217.89
ALLEN AVIONICS VIT-75-3 ANALOGUE VIDEO ISOLATION TRANSFORMER 3 channel Stock code: 90-6317
Ordered on demand, cancellations may incur charges, available in 1‑2 weeks. Need it sooner? Call us
$535.09
ALLEN AVIONICS SDI-VIT-75 SD VIDEO ISOLATION TRANSFORMER Stock code: 90-6321
Ordered on demand, cancellations may incur charges, available in 1‑2 weeks. Need it sooner? Call us
$168.36
ALLEN AVIONICS HD-VIT-75 HD VIDEO ISOLATION TRANSFORMER Stock code: 90-6322
Ordered on demand, available in 1‑2 weeks. Need it sooner? Call us
$210.45