#323

Here is a super=simple technique to use time-domain-reflectometry (TDR) with your scope, a battery and a resistor, to measure the length of coax, twisted pair wires, Ethernet cable (Cat5, Cat5e, Cat6, etc.), zip-cord, etc. Previous videos on transmission lines, reflections and TDR measurements are here:
Transmission lines, reflections and terminations:
   • #143: Transmission Line Terminations ...  
Basic TDR measurements with a scope:
   • #37: Use a scope to measure the lengt...  
Cheap TDR with Schmitt Trigger oscillator:
   • #88: Cheap and simple TDR using an os...  
Notes from this video:
http://www.qsl.net/w2aew/youtube/Simp...