metal dector for barbed wire fences
"Irv Finkleman" wrote in message
...
If there is a free end accessible you might try feeding some rf into it
and then following along with a receiver to detect the underground
portions. This may or may not require strong attentuation at the
receiver antenna -- using a short loop or something across the input.
If there is one level. chances are you may find others underneath with
a little digging unless there are accessible ends to them whereas tracking
the RF would work just as well.
Just a wild and maybe not so crazy idea of how I'd try for a quick cheap
fix.
Irv VE6BP
Good idea. RF tracking works very well for buried cables and should work
for fence wire. I used it some years ago when we were adding antennas to an
existing field and needed to know exactly where to dig only by hand. The
device is in two pieces, one of which couples RF onto a cable by induction
(from up to several feet away); the other piece is a receiver which detects
the re-radiation from the cable up to several feet away. The transmit unit
and the receive unit need to be separated about fifty feet apart or more for
this to work. Otherwise, you will get direct coupling through the air and
not via the conductor you're tracking. The receiver sensitivity was
adjustable on the one I used.
I rented our unit from a surveyors' supply house. Rent, try, buy. good
luck.
"Sal"
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