[HBQRP] More o'scope stuff..

[Arnie Grubbs]

Hi Group,

At the last meeting the topic was O'scopes and the various things you can do with
them.  One of the topics was to use it as a TDR for learning things about a transmission line.
TDR => Time Domain Reflectometer.   It measures the voltage of the signal on a transmission line
in in the time domain.   In other words it shows the voltage over time as the wave moves down the line.

Here are a couple of YouTube vid's that are very good at showing the theory behind how it works, and
then on the 2nd vid, the host ( W2AE W)shows a simple circuit that you can build to give you a fast rise time
square wave signal that will work well with the scope to allow you to measure the transmission line.

Info                http://youtu.be/Il_eju4D_TM



Circuit and examples       http://youtu.be/9cP6w2odGUc


He also has a lot of other interesting vids if you care to check them out.. 

I hope that it warms up by next weekend!   See you at the meeting in Ashland next Saturday!

By the way, who ever knows....are we going to be donig a 'test build' for the OzarkCon Build-a-thon next weekend or
should we bring other stuff to keep us busy?



73 - Arnie KA0NCR