i have some time domain reflectometery paper - work for sale . its 3 Hewlett / Packard application note manuals ; 1) note 62....." time domain reflectometery "...10 pages 2) note 67....." cable testing with T D R ".....10 pages 3) note 75....." selected article on T D R applications "...40 pages i also have a card board " slide rule " type of T D R calculator . if interested in this stuff , let me know . WALT , waterbury , ct .