For project night at our radio club back in September, I fabricated a kit for a low duty cycle pulse generator called Pizzicato. The original article, by G. Steinbaugh, PE AF8L, appeared in the March/April 2006 issue of QEX. You can use it in conjunction with an oscilliscope to do TDR(Time Domain Reflectometry). I modified the design to have all the components mounted on a single double sided PC board. I have 60 or so kits remaining. Send me a PM if you're interested.
http://www.arrl.org/qex/2006/03/steinbaugh.pdf
http://www.arrl.org/qex/2006/03/steinbaugh.pdf