In Broadcast - April 2012 - 50


WWW.INBROADCAST.COM | ISSUE 7 - APRIL 2012

InGEAR
Mobile Power Supplies
David Kirk looks at some of the latest developments in portable power for broadcast video and audio content acquisition
Analogue broadcast engineers never retired. Leveraging their intimate knowledge of Ohm’s Law, they started companies making battery chargers and power packs. The batteries were boxed into whatever shape least resembled the AA cells which most of them actually contained. Laptop computer manufacturers later adopted this technique to prevent customers simply buying new rechargeable cells when the originals needed replaced. Many manufacturers recommend their own brands of battery which can be an expensive nuisance if the shape is unusual or, as with an increasing number of portable computing devices, the cells are hard-wired into the motherboard. The transition from tape-based to solid-state video and audio recording over the past few years has m a d e life a lot easier for everyone involved in mobile video and audio content acquisition. Eliminating the need for tape drive motors and scanning wheels has reduced battery drain to a much lower level. Power consumed by LCD viewfinders has also fallen with the transition from fluorescenttube to LED backlighting and will decline further as OLED viewfinders become commonplace. Some of the latest-generation video and audio equipment could easily be powered, or at least recharged, from solar cells though this is not yet an entirely safe option for northern Europe. dependent on the cell’s age. Hence the advisability of ‘topping up’ the charge before heading out on a shoot – unless the manufacturer specifically advises otherwise. The following is an overview of companies offering batteries and chargers for the broadcast production market, concentrating where possible on what is new.
David Kirk

Anton/Bauer
Anton/Bauer has announced the QRCCA940 Gold Mount battery, designed for the new Canon EOS C300 camera. The QRC-CA940 operates in a similar way to the company’s existing Gold Mounts but has three PowerTap outputs to enable multiple accessories to be powered along with the C300. The new battery is compatible with the company’s mounting bracket for 15 or 19 millimetre rod systems.

The Right Chemistry
Battery chemistry has advanced considerably in recent years. Ecological concern about disposing of cadmium accelerated a shift from nickel-cadmium compositions to nickel-metal-hydride. Lithiumion batteries have also become commonplace and are now reported to account for over 65 per cent of all portable secondary battery sales in Japan. Every power cell is essentially a very large capacitor comprising a positive and a negative plate separated by a dielectric insulator. The insulation gradually degrades which in turn causes internal power leakage at a rate

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include higher charge and discharge current, high security (no separation of oxygen so no thermal runaway possible) and long lifespan (more than 1,000 charge and discharge cycles. A single BLOQ PDW-700 is designed to run for more than two hours and it takes less than one hour to recharge. The cell packs have to conform to IATA air transport requirements. If a short circuit or load higher than 11.5 amperes is detected, the battery is switched off within a few milliseconds and can be switched on by being shaken. An internal protection circuit logs PC-downloadable performance data including the number of overloads (together with the date of occurrence), highest and lowest temperature and the number of charging cycles.

Blueshape
Blueshape offers a wide range of battery packs and chargers for large and small camcorders. Recent additions include the BV190HD V-lock pack, CVS8XW intelligent charger, and MVQuick/ MVQuickAB adapters (with optional hot-swap). All Blueshape b a t t e r i e s are fully CEcompliant and, for additional safety, encased in flameretardant plastic.

Cine 60
Cine 60 has introduced a new battery with V-Mount Adapter. The BLOQ incorporates lithium iron phosphate cells which are claimed to offer higher performance than lithium-ion batteries. Most lithium-ion batteries (Li-ion) use lithium cobalt oxide cathodes. Advantages of the BLOQ

Blueshape powering an Arri Alexa

Frezzi Energy Systems
Frezzi Energy Systems has introduced an all-in-one batterypowered lighting kit including the company’s PBC charger and PB-65 Power Block battery. The
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Anton/Bauer QRC-CA940 for the EOS C300


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Table of Contents for the Digital Edition of In Broadcast - April 2012

In Broadcast - April 2012
Contents
Broadcast Networks Delivers for Arqiva
Swedish Hockey Safe in the Bank
Viewcast Launches Niagara 9100 Series
Cavena: Enhancing the Value of Content
Broadcast Pix Announces Video Control Center 3.0
Telecast’s Latest Innovations
Glidecam Introduces XR-Series Stabilisers
Qvest Media Live With Code One Streaming
Volicon Extends Observer Utility
Petrol Bags Add to Audio & DSLR Range
In Broadcast - April 2012 - In Broadcast - April 2012
In Broadcast - April 2012 - Cover2
In Broadcast - April 2012 - Contents
In Broadcast - April 2012 - Broadcast Networks Delivers for Arqiva
In Broadcast - April 2012 - 5
In Broadcast - April 2012 - Swedish Hockey Safe in the Bank
In Broadcast - April 2012 - 7
In Broadcast - April 2012 - 8
In Broadcast - April 2012 - 9
In Broadcast - April 2012 - 10
In Broadcast - April 2012 - 11
In Broadcast - April 2012 - 12
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In Broadcast - April 2012 - 21
In Broadcast - April 2012 - Viewcast Launches Niagara 9100 Series
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In Broadcast - April 2012 - 24
In Broadcast - April 2012 - 25
In Broadcast - April 2012 - 26
In Broadcast - April 2012 - Cavena: Enhancing the Value of Content
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In Broadcast - April 2012 - Broadcast Pix Announces Video Control Center 3.0
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In Broadcast - April 2012 - Telecast’s Latest Innovations
In Broadcast - April 2012 - 55
In Broadcast - April 2012 - Glidecam Introduces XR-Series Stabilisers
In Broadcast - April 2012 - 57
In Broadcast - April 2012 - 58
In Broadcast - April 2012 - 59
In Broadcast - April 2012 - 60
In Broadcast - April 2012 - 61
In Broadcast - April 2012 - 62
In Broadcast - April 2012 - Qvest Media Live With Code One Streaming
In Broadcast - April 2012 - 64
In Broadcast - April 2012 - 65
In Broadcast - April 2012 - Volicon Extends Observer Utility
In Broadcast - April 2012 - 67
In Broadcast - April 2012 - 68
In Broadcast - April 2012 - 69
In Broadcast - April 2012 - Petrol Bags Add to Audio & DSLR Range
In Broadcast - April 2012 - Cover3
In Broadcast - April 2012 - Cover4
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