Product category:
Cables and Wires
News Release from: Bryant Broadcast and Data Communications | Subject: Cables and connectors for HDTV
Edited by the Electronicstalk Editorial
Team on 02 August 2005
HDTV demands specialist cables and
connectors
To handle HDTV, broadcasters are faced with investing a considerable amount of money in new equipment - a big investment and one that needs to be right first time.
To handle HDTV, broadcasters are faced with investing a considerable amount of money in new equipment, such as cameras, remote broadcast units, control rooms, cables, new titling and editing equipment, new tape machines, new rigs for their new OB vans: it's a big investment and one that needs to be right first time For HDTV cables a bandwidth of 750MHz and datarate of 1.5Gbit/s is necessary with good return loss performance at the third harmonic frequency of 2.25GHz (3 x 750)
This article was originally published on Electronicstalk on 29 Aug 2002 at 8.00am (UK)
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Catalogue covers broadcast and networking
Bryant Broadcast has finally published its much requested new catalogue.
U-links maiintain video signal integrity
A new range of one-piece near-75ohm MUSA U-links alleviates problems associated with solder joints, kinked cables or internal junctions causing SDI signal reflections or failures in video routing.
SMPTE 292E details a bandwidth of 2.4GHz.
Insertion losses at HDTV frequencies are much greater than with SDI at 270Mbit/s and need to be kept well below 20dB.
Bryant BD SD11 and Belden 1694A coaxes intended for HDTV applications are currently tested up to 3GHz and have a typical RL of 30dB.
Further reading
Hybrid monitor cable takes audio, video and power
A novel hybrid monitor cable improves performance over legacy BBC PIF8/1 combined video/audio/power cable types.
Patch panels bring USB and FireWire to studio use
Bryant Broadcast has launched "back to back" patch panels for both USB and FireWire/IEEE1394a protocols.
The "headroom" built in to these cables allows up to 6dB below the recommended 20dB.
Bryant broadcast MUSA jackfields (as used in the BBC's massive new HD OB unit 12) have been independently tested to an unbeatable 5GHz to cover integrity of signals up to and including the seventh harmonic - way beyond current SMPTE requirements.
Bryant coaxial connectors, patch cables and MUSA or BNC patch bays are as close to "true" resistive 75ohm loads as is technically possible to prevent impedance mismatching and signal reflections.
The Switchcraft VPP Video Patchbay with 24 or 26 self-normalling (switching) jacks is rated from DC to 3.0GHz and meets SMPTE 292M specifications.
The Switchcraft MVP mid-size series offers 32 self-normalling (switching) jacks, rated at 30,000 life cycles in either 1 or 2U, complete with cable tie bars.
As with the VPP range, jacks may be terminated or nonterminated to suit.
The rear BNC part of the switching jacks are staggered by row to make installation of BNC cabling much simpler in the confined space of 1U.
Belden's New RG-179 Type coaxial cable is ideal for HDTV broadcast trucks - weighing about 60% less and taking up to 40% less space than standard Mini RG-59/U type coaxes.
Belden's new 179DT coax was designed for use in analogue, SDI, HD video and AES/EBU digital audio transmissions.
Brilliance DigiTruck 179DT Coax has a guaranteed return loss of 21dB (minimum) and is sweep tested to 3GHz.
This mimics the return loss performance of Belden's most popular Brilliance precision video cables, providing 6dB of RL headroom against the SMPTE 292M specification.
179DT features a highly crush-resistant, foamed high-density polyethylene (FHDPE) dielectric to help ensure the durability of the cable - a particularly important characteristic for use on outside broadcast trucks - and a foil/braid shield consists of a unique lightly bonded Duobond tape that can either be left bonded to the insulation to simplify termination with one-piece connectors or removed for use with multipiece designs.
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