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Re: Improved Spectra-Strip Cable -- TPO insulation




Hi Gerard,

I agree with you that we need to get an attenuation curve for the cable we
intend to use. I have dusted off an old program that can propagate pulses
through different cables, but it requires the attenuation spectra as
input. As an example I have run the program to propagate a Gaussian pulse
shape through standard twisted pair ribbon cable (9V28) for two different
lengths of cable (figures attached). I would expect increased dispersion
in the new cable due to smaller dimensions. The program is available if
anyone would like to use it.

Cheers, Elton.



Elton Smith
Jefferson Lab MS 12H5
12000 Jefferson Ave
Suite # 16
Newport News, VA 23606
elton@jlab.org
(757) 269-7625
(757) 269-6331 fax

pulses

slewing

  WAVE_PROP Version III, Today is Dummy Date             


  Top Drawer Plot Title=GAUSS, mean=30 ns, sigma=10 ns                    
  
  Period of Fourier Integral Transform    =  200.
  Limits of pulse Integration and plotting=  0. to  50.
  
  Wave Form:  Specification=GAUSS     
  Description: Gaussian with mean=  30.ns and sigma=  10. ns
  
  Computed Input Pulse parameters:
  Rise time (10-90%)             =  16.87743
  Fall time (10-90%)             =  16.8767281
  Full Width at Half Maximum     =  23.5610981
  Peak Value                     = -0.499755919
  Pulse sum                      = -11.8968077
  
  Cable Type =9V28       of length=  10. m
  .050 Vari-Twist Flat Cable (28 gauge), Belden catalog p. 183
  
  Computed Output Pulse parameters:
  Rise time (10-90%)             =  17.8414078
  Fall time (10-90%)             =  22.3753738
  Full Width at Half Maximum     =  25.3227711
  Peak Value                     = -0.408807755
  Pulse sum                      = -9.96175289
  
  Parameters for Systematic Study:
  Disc Threshold (V)= -0.100000001
  Relative pulse height variation:  0.5 to   1.5 of output
  Plot Limits of time over threshold  :  0. to   50.
  WAVE_PROP Version III, Today is Dummy Date             


  Top Drawer Plot Title=GAUSS, mean=30 ns, sigma=10 ns                    
  
  Period of Fourier Integral Transform    =  200.
  Limits of pulse Integration and plotting=  0. to  50.
  
  Wave Form:  Specification=GAUSS     
  Description: Gaussian with mean=  30.ns and sigma=  10. ns
  
  Computed Input Pulse parameters:
  Rise time (10-90%)             =  16.87743
  Fall time (10-90%)             =  16.8767281
  Full Width at Half Maximum     =  23.5610981
  Peak Value                     = -0.499755919
  Pulse sum                      = -11.8968077
  
  Cable Type =9V28       of length=  20. m
  .050 Vari-Twist Flat Cable (28 gauge), Belden catalog p. 183
  
  Computed Output Pulse parameters:
  Rise time (10-90%)             =  19.1020107
  Fall time (10-90%)             =  34.2358589
  Full Width at Half Maximum     =  27.4836102
  Peak Value                     = -0.336869925
  Pulse sum                      = -8.26691246
  
  Parameters for Systematic Study:
  Disc Threshold (V)= -0.100000001
  Relative pulse height variation:  0.5 to   1.5 of output
  Plot Limits of time over threshold  :  0. to   50.