5N10.28 - Coaxial Cable - Delay Line

Code Number:
5N10.28
Demo Title:
Coaxial Cable - Delay Line
Condition:
Excellent
Principle:
Cable Design
Area of Study:
Electricity & Magnetism
Equipment:
Large Coaxial Cable Samples, Oscilloscope, Wave Generator, and Long and Short BNC Cables.
Procedure:

No advanced notice is required for the show and tell coax cables unless smaller diameters of cable are desired.

The delay line will work as shown with the pulse generator.  However, using one of the Wavetek function generators will give you a smoother and more measureable oscilloscope trace.

References:
  • Herman Erlichson, "Kelvin and the Trans-Atlantic Cable", TPT, Vol. 44, #7, Oct. 2006, p. 426.
  • Se-yuen Mak, "Speed of Electromagnetic Signal Along a Coaxial Cable", TPT, Vol. 41, #1, Jan. 2003, p. 46.
  • Levi Gray, "Fast Pulses in a Coaxial Cable", TPT, Vol. 23, #2, Feb. 1985, p. 91. 
  • Vinicius M. Lenart, Romeu M. Szmoski, Rozane F. Turchiello, Sergio L. Gomez, "Standing Waves in a Coaxial Cable:, A Simple and Low-Cost Experiment for an Instructional Wave Laboratory", AJP, Vol. 89, #1, Jan. 2021, p. 105.
  • J. S. Bobowski, "Modeling and Measuring the Non-Ideal Characteristics of Transmission Lines", AJP, Vol. 89, #1, p. 96, Jan. 2021
  • Alain Haché and Abderrahim Slimani, "A Model Coaxial Photonic Crystal for Studying Band Structures, Dispersion, Field Localization, and Superluminal Effects", AJP, Vol. 72, #7, July 2004, p. 916.
  • Se-yeun Mak, "Speed of Radio Waves Along a Coaxial Transmission Line", AJP, Vol. 72, #5, May 2004, p. 671.
  • George H. Watson, "Transmission Line Exercises for the Introductory Physics Laboratory", AJP, Vol. 63, #5, May 1995, p. 423.
  • F. Holuj, "Simple Measurements Involving Transmission Lines", AJP, Vol. 50, #3, Mar. 1982, p. 282.
  • John Moore, Christopher Davis, and Michael Coplan, "6.2", Building Scientific Apparatus, p. 374 - 378.
  • W. R. Thurston, "The Measurements of Cable Characteristics (Part II)", The General Radio Experimenter, Vol. 32, #1, June 1957.
  • Horatio W. Lamson, "The Measurements of Cable Characteristics", The General Radio Experimenter, Vol. 31, #12, May 1957.
  • F. D. Lewis and Robert M. Frazier, "A New Type of Variable Delay Line", The General Radio Experimenter, Vol. 31, #5, Oct. 1956.

Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist.  The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose.  The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources.  Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks.  These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage.  Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.