©2011 Belden Bend Radius Steve Lampen Multimedia Technology Manager Belden Hollywood Post Alliance Technology Retreat Rancho Mirage, California, February.

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Presentation transcript:

©2011 Belden Bend Radius Steve Lampen Multimedia Technology Manager Belden Hollywood Post Alliance Technology Retreat Rancho Mirage, California, February 18, 2011

©2009 Belden What We Believed  Bending a cable affects the performance. –Affects dimensions = impedance –Impedance = reflection = Return Loss  “Don’t bend tighter than 10x diameter”  Damage cannot be undone –Unbending cable only hides damage  Stranded cables are better at bending.  Flexible cables are better at bending.  Smaller cables are better at bending

©2009 Belden What We Did

©2009 Belden What We Did  Cone mandrel  6” circumference maximum  1” circumference minimum Cone CircumferenceEquivalent DiameterRadius 6 inches1.908 inches.954 inches 5 inches1.592 inches.796 inches 4 inches1.272 inches.636 inches 3 inches.954 inches.477 inches 2 inches.636 inches.318 inches 1 inches.318 inches.159 inches

©2009 Belden What We Did  Tektronix 11801C –Digital Sampling Oscilloscope –Broad-spectrum signal, 17.5psec risetime  Special test jig for 75Ω coax –No connectors! –We weren’t very careful Not looking at connector  First test – unbent  6”, 5”, 4”, 3”, 2”, 1”  Folded cable with pliers  Unfolded cable by hand

©2009 Belden Cables We Tested  All Belden cables –No competitors  Belden 1694A HD coax RG-6  Belden 1505A HD coax RG-59  Belden 1694F HD coax flexible RG-6  Belden 1505F HD coax flexible RG-59

©2009 Belden Coax Requirements  Bending changes dimensions  Dimensions = Impedance  Variations in Impedance = Return Loss  Return loss = signal reflection  Belden return loss on coax –Typical -30 dB (99.9% match, 0.1% reflection)

©2009 Belden Coax Requirements –4.5 GHz Guarantee: -23 dB 5 MHz -1.6 GHz -21 dB 1.6 GHz GHz –1694F and 1505F Flexible cables (much less precise) -20 dB 5 MHz MHz -15 dB 850 MHz GHz –SMPTE limit (all passive parts in the line) -15 dB 5 MHz GHz -10 dB 1.5 GHz - 3 GHz

©2009 Belden Critical Distance  Quarter-wavelength –4.5 GHz = inches –3 GHz = inches –1.5 GHz = inches –405 MHz = inches

©2009 Belden Belden 1694A HD Coax CircumferenceDiameterRadiusX 1694A Diameter 6 inches1.908 inches.954 inches inches1.592 inches.796 inches inches1.272 inches.636 inches inches.954 inches.477 inches inches.636 inches.318 inches inches.318 inches.159 inches0.58 Belden 1694A diameter (OD) = 0.275”

©2009 Belden Belden 1694A Normal

©2009 Belden Belden 1694A at 3.47 x Diameter

©2009 Belden Belden 1694A at 2.85 x Diameter

©2009 Belden Belden 1694A at 2.31 x Diameter

©2009 Belden Belden 1694A at 1.73 x Diameter Low point = 73.15Ω= dB RL

©2009 Belden Belden 1694A at 1.16 x Diameter Low point = 71.95Ω= dB RL

©2009 Belden Belden 1694A at 0.58 x Diameter Low point = 67.5Ω= dB RL

©2009 Belden Belden 1694A Folded with Pliers Low point = 49.7Ω= dB RL

©2009 Belden Belden 1694A “Unfolded” Low point = 68.5Ω= dB RL

©2009 Belden Stress Whitening

©2009 Belden Belden 1505A CircumferenceDiameterRadiusX 1505A Diameter 6 inches1.908 inches.954 inches inches1.592 inches.796 inches inches1.272 inches.636 inches inches.954 inches.477 inches inches.636 inches.318 inches inches.318 inches.159 inches1.18

©2009 Belden Belden 1505A Normal

©2009 Belden Belden 1505A at 4.06 x Diameter

©2009 Belden Belden 1505A at 3.39 x Diameter

©2009 Belden Belden 1505A at 2.71 x Diameter

©2009 Belden Belden 1505A at 2.03 x Diameter

©2009 Belden Belden 1505A at 1.35 x Diameter

©2009 Belden Belden 1505A at 1.18 x Diameter Low point = 72.7Ω = dB RL

©2009 Belden Belden 1505A Folded with Pliers Low point = 62.49Ω = dB RL

©2009 Belden Belden 1505A Unfolded Low point = 71.83Ω= dB RL

©2009 Belden Belden 1694F CircumferenceDiameterRadiusX 1694F Diameter 6 inches1.908 inches.954 inches inches1.592 inches.796 inches inches1.272 inches.636 inches inches.954 inches.477 inches inches.636 inches.318 inches inches.318 inches.159 inches0.58

©2009 Belden Belden 1694F Normal

©2009 Belden Belden 1694F at 3.47 x Diameter

©2009 Belden Belden 1694F at 2.85 x Diameter

©2009 Belden Belden 1694F at 2.31 Diameter

©2009 Belden Belden 1694F at 1.73 x Diameter

©2009 Belden Belden 1694F at 1.16 x Diameter Impedance 73.5Ω = RL dB

©2009 Belden Belden 1694F at 0.58 x Diameter Impedance 71.95Ω = RL dB

©2009 Belden Belden 1694F Crushed with Pliers Impedance = RL dB

©2009 Belden Belden 1694F Unbent by Hand Impedance 70.92Ω = RL – dB

©2009 Belden Belden 1505F CircumferenceDiameterRadiusX 1505F Diameter 6 inches1.908 inches.954 inches inches1.592 inches.796 inches inches1.272 inches.636 inches inches.954 inches.477 inches inches.636 inches.318 inches inches.318 inches.159 inches1.18

©2009 Belden Belden 1505F at 4.06 x Diameter

©2009 Belden Belden 1505F at 3.39 x Diameter

©2009 Belden Belden 1505F at 2.71 x Diameter

©2009 Belden Belden 1505F at 2.03 x Diameter

©2009 Belden Belden 1505F at 1.35 x Diameter Impedance 70.77Ω = RL dB

©2009 Belden Belden 1505F at 1.18 x Diameter Impedance 67.37Ω = RL dB

©2009 Belden Belden 1505F Squeezed with Pliers Impedance 51.63Ω = RL – dB

©2009 Belden Belden 1505F Unbent by Hand Impedance 68.48Ω = RL – dB

©2009 Belden Belden 1505F 24-Hours Later Impedance 71.95Ω = RL –33.66 dB

©2009 Belden Conclusions  Cable can withstand severe bending. –Quality cable can withstand bending of 2 x diameter, or even less. –Stranded/flexible cables are no better than solid. –With audio, flexible cables can outperform less flexible.  Much performance returns when unbent.  Jacket discoloring/whitening indicates abuse.  Smaller cables seem to have great bend tolerance.  While coax has more consistent impedance… –Bend recovery of coax and paired cable are virtually identical.  Encourage other manufacturers to perform similar tests.

©2009 Belden 9,000 pages 1,000,000+ hits per week Samples: