Problems with mains hum and got no space?


TV-Bay Magazine
Read ezine online
There can’t be many of us who have managed to avoid an annoying mains hum at some point or other in our careers. You have just finished a set up on location with a long cable run back to the OB van, you sit down to monitor the signal and there it is. It’s not the end of the world but you do now face rummaging through your tool box to find an isolation device of some kind, all the while keeping your fingers crossed someone has not borrowed it or that you remembered to bring it. It would be so much better if it was always set up ready and waiting. Well, just such a device is now available.
Tucked away on the Canford stand at PLASA Focus I discovered their interestingly named Zero-U Rack Mounted Line isolation unit. The devices each feature 8 channel s and are designed to provide that desperately needed isolation between input and output, we were just talking about. They come in either 110 ohm balanced or 75 ohm unbalanced circuits. Each channel has a 1:1 transformer; balanced circuit versions have an ‘earth-lift’ switch. They are housed in a 1U rack-mounting enclosure with innovative mounting options. The balanced circuit version has XLR connectors for input and output, one female, one male, located in pairs on one face. Earth-lift switches for each channel are located on the opposite face of the fully-screened case.
The unbalanced circuit version has BNC female connectors for input and output, located in pairs on one face; there is no earth lift facility on this type. They are designed to be mounted in a number of different ways within a 19 inch rack and this is the bit I really like and where the Zero U name comes in. Using clever little L shaped mounting plates, you are able to mount the isolators into the rack at a depth that enables you to fill all available rack space at the front with all the devices you need immediate access to whilst the isolators sit behind them, out of the way. Once set up there is no reason to ever have to move it and if you ever do get that hum it is taken care of straight away.

Tags: iss065 | mains hum | canford | N/A
Contributing Author N/A

Read this article in the tv-bay digital magazine
Article Copyright tv-bay limited. All trademarks recognised.
Reproduction of the content strictly prohibited without written consent.

Related Interviews
  • 12G 4K microMUSA Jackfield and Fibre Termination Solutions from Canford at IBC 2018

    12G 4K microMUSA Jackfield and Fibre Termination Solutions from Canford at IBC 2018

  • Canford at BVE 2017

    Canford at BVE 2017


Articles
Peli Air 1507 Review
Phil Vinter Originally named after a bird that carries its precious cargo through the skies, it was, perhaps, only a matter of time before Peli released its Air range.
Tags: iss133 | peli | peli air 1507 | trekpak | Phil Vinter
Contributing Author Phil Vinter Click to read or download PDF
OB999 Accelerates Hill Climb Broadcast
Nick Collier Over the last century, The Shelsley Walsh Speed Hill Climb has been attempted by some of the world’s most accomplished racing drivers striving to be the fastest up the 1,000 yard, 1 in 6 gradient track.
Tags: iss133 | ob999 | blackmagic | atem | multicam | videohub | cleanswitch | premiere pro | hyperdeck | Nick Collier
Contributing Author Nick Collier Click to read or download PDF
Ruth Matos Interview - A Career Unfolds
Ruth Matos We first met Ruth when we employed her as a student to help with our live studio at BVE in 2013. We were struck by her determination, passion and ‘I’ll do anything to help’ attitude. We became friends of Facebook and have since seen her career in the industry develop and unfold. We thought it was about time to catch up and share her inspiring story of where she is now, how she got there and the challenges she has faced along the way.
Tags: iss133 | interview | filmming | career | education | Ruth Matos
Contributing Author Ruth Matos Click to read or download PDF
The Pace of Change
Dick Hobbs - new

The youngest human to stand on the moon (so far) was Charles Moss, the lunar module pilot of Apollo 16. Charlie had a wonderful claim: his father witnessed the Wright Brothers’ first flight at Kitty Hawk, and lived to see his son on the moon.

Does anything capture the speed of technological advance better than that? The whole of the history of powered flight in one lifetime.

Tags: iss133 | state of the nation | st2110 | st2110-10 | Dick Hobbs - new
Contributing Author Dick Hobbs - new Click to read or download PDF
Taking on a self employed placement year
Joshua Round The idea of being self-employed or freelancing has always been somewhat terrifying for me. There is a level of uncertainty and responsibility that comes with the freedom of being self-employed, the likes of which makes me wonder why I chose to give it a go for my placement year as part of my university course - (BSc) Television and Broadcasting.
Tags: iss133 | placement year | university | student | education | portsmouth | Joshua Round
Contributing Author Joshua Round Click to read or download PDF