On Sun, 25 Oct 2015 19:30:25 -0700 (PDT),
wrote:

Halfway between the house and street there is a power box and telephone tower junction box.
The cable contractors seem to think that there must be a junction fortune empty
conduit in the vicinity of the power / telephone boxes. They are about 325 ft
from the house and street. They told me I need to locate the junction myself
before they can run a cable line.

Local code probably won't allow the cable company to run coax cable
inside the power conduit, so that's out. It's likely that there's one
pull box every 100-150ft or so. The distance varies depending on the
age of the system and local code.

Step one is to go until the local planning department and see if they
have permit applications and plans for your house.

It's likely that the two conduits parallel each other for the entire
length. If you can inject a signal/tone into the power line, you can
follow it around the property. The signal conduit will be fairly
close and parallel.

I've used a stethoscope and an air compressor on lines where a snake
isn't possible. Blow compressed air in one end and you can hear the
sounds of any leaks along the line. Any exit points, such as pull
boxes will be obvious. Don't pressurize the conduit or you'll blow
the lid off a pull box and let water in. It doesn't work under hard
pack dirt, concrete, deep conduit, or next to noisy roads, but it's
quick and easy. If you want to get fancy, two microphones going to
separate oscilloscope inputs. The ratio of the delays will mark the
relative position of the conduit. If you can't hear the air leaks,
make a whistle from a piece of PVC pipe and shove that into the
conduit.
https://www.google.com/#q=pvc+pipe+whistle
http://www.instructables.com/id/Simple-PVC-Whistle/ (see step 4)

Get the kids involved. I think they'll find it interesting.





--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558