"Jeff Liebermann" wrote in message
news
On Mon, 26 Oct 2015 07:36:00 -0700 (PDT),

snip

If the pipe is steel, you won't get any RF through it. There are low
frequency pipe finders that will go through dirt. However, they
require a tracer wire be buried with the conduit.

+++++++++++++++++++++++++++++++++++++++++

.... and if the pipe is steel a two-unit tracer will work. They can be
rented from a surveyors' supply store -- or at least they could when I
rented one in Anchorage to trace existing antenna cables at the HF xmtr site
at Elmendorf AFB.

Unit 1 is laid on the ground over the known location of any part of the
conduit, cable, water pipe -- whatever you have to trace -- and it couples a
low-power, low-freq signal into the ground and into the trace object. Unit
2 is handheld and is used to follow the reradiated signal from the conduit,
somewhat in the manner of a metal detector. (Just don't get too close to
Unit 1 or you pick it up through the air and you don’t trace anything.)

For the dozen or so cables that were intertwined close to Air Force
transmitter building, my tracing was sometime a bear. For one conduit, you
should be able to do it easily. If you can’t rent one, find a surveyor who
owns one and maybe you can pay him to send a helper to your house with his
tracer. Youtube has multiple videos that display the use. From my
experience, every one of the half-dozen videos I opened was dumb-looking, so
I can’t recommend any videos. However, if something is better than nothing,
search on Youtube for underground conduit tracer and make your own
evaluation. I think my tracer in 1995 was pretty easy to use. Unit 1
output power and Unit 2 sensitivity were both adjustable.

This one video sucks the least ... but the guy begins by demonstrating it
with insufficient separation, which is wrong.
https://www.youtube.com/watch?v=UNCTpk1W5cU

"Sal"
John, KD6VKW