Hackers Measure Cable Lengths with Time Domain Reflectometers

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Dont Ask Meimnoexpert:

Looks pretty simple!!

Originally posted on Hackaday:

[android] has built up a fast edge pulse generator for time domain reflectometry (TDR). TDR is a neat technique which lets you measure cable lengths using electrical signals and can also be used to locate faults within the cable.

TDR works by sending a pulse down the cable. When the pulse reaches the end of the unterminated cable it is reflected back to the source. By monitoring the delay between the original pulse and its reflection you can determine the length of the cable. We’ve seen projects that use TDR before, and it’s often used in telecoms industry to locate faults in long cable runs.

You can try TDR in your lab using only a scope to observe the delay and a function generator to create the pulse. However, the technique works a lot better with pulses that have very fast rise times. So [android] built a fast edge…

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It’s All Good

This post has been a long time coming!!  I’m tired and busy right now, so I need to make it brief. I’ve spent too much time thinking my life is ‘small’……..many mechanisms of modern life can contribute to that type of mindset. There’s been a lot of dialogue about that very thing lately; ‘Everyone’s life is great and mine isn’t……..just look at Facebook and you’ll see!”  Poppycock, I say.

I have a great life. I have two amazing kids. I have a (fairly) loving wife. I have a good job and a good home in a good neighborhood. I have a smart brain and a good education. I help others who have a hard time helping themselves.

I can exert very little control over what mean people do to nice people who own a pizzeria in Indiana. I can do very little to impact human trafficking in Cambodia. I doubt that I can do a lot this week to effect polar ice caps or radiation leakage somewhere. Nope I don’t own anything that floats.  But, I can do something and I do do MANY things to help the world while living a full life. No, my life isn’t amazing. It isn’t filled with supermodels and high performance motorcycles (and whatever other stupid material thing that wont come to mind right now!) But I have good people and good co-workers and good neighbors and good fellow church-members in my life…..and that’s good. My life is good and I want to keep giving GOOD back to the world. I’m OK….I’m really, really OK…..and that’s great. Heck, that’s a long way from a ‘small life’!

Remember all the good in your life. Entropy resides all around us. Drink in today’s good stuff….because it won’t last forever!

It is what you make it!