Kinell wrote:
What Harry described is a Time-Domain Reflectometer (aka TDR). Not
a lot of people know that.

I remember when I did my HNC Electronics (30+ years ago now) we used an
oscilloscope to measure signal reflections in a cable of different length.

Never used that technique since, but I know it does work.

Andrew

--
Please note that the email address used for posting
usenet messages is configured such that my antispam
filter will automatically update itself so that the
senders email address is flagged as spam. If you do
need to contact me please visit my web site and
submit an enquiry - http://www.kazmax.co.uk