metal dector for barbed wire fences

Cats would give more than a one shot response. Art

Hey, wouldn't a dipole antenna launch a nice standing-wave pattern into a long horizontal wire? Seems like another antenna could pick that up.

I bet the pair of rusty wires would generate some useful harmonics, too. Sort of like PIM, Passive Intermodulation Distortion. Yeah, that one is interesting.

I'm wondering if you can make a simplified version of that detector. Say one drive coil, one sense coil, and then a null circuit, something like the hybrid used on a POTS line. In fact, I'm guessing that is how those electronic stud finders work. There can't be all that much electronics in them due to the low cost. A patent search would be useful here.

Another idea is a nonlinear junction detector, since fencing has lots of crappy wire/oxide/wire junctions.

stud finders find wooden studs too. for a sensor mine appears to use a U shaped copper wire antenna attached to pin 7 and 2 of a of a NE555 wired as an astable. looks like capacitive sensing there are no other capacitors on that pin.

the other chip in there is an Elan EM78P153SPJ microcontroller with a

but does it have enough?

electric fencing has fewer junctions, but broadcasts a pulse at regular intervals (but only while on).

elaborate

n will

Don posts here from time to time -- why not shoot him an email?

You know, they sell back up camera's pretty cheap these days.

And if you really want to get fancy, you can use an industrial fanless PC brick and drop a video decoding program in there using a cheap USB camera..

Jamie

I cannot think of any fence detection system which likely to be more effective than a pair of human eyes and a brain.

If you are looking for a method of delineating the edge of a paddock, so a tractor on automatic guidance does not run into the fence, it might be simpler to drive once around the paddock with a precision GPS unit mapping the 'keep in' area. Then supply that map to the guidance system.

READ it again, dork.

HAVE YOU (pretty simple to get)

EVER (even more simple)

SEEN THE PATTERN (a reference to something real)

ON SATURN (Pure simplicity)

How could you be so stupid as to NOT get what was said?

I think you are an idiot who heard "nature abhors" one too many times, and it became a favorite thing for you to bark out.

AGAIN, it was a silly remark, and THAT is being nice.

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.highlandtechnology.com=A0 jlarkin at highlandtechnology dot com

LOL! Yes, designers ALWAYS make the solution using the 'hammer' they brought.

No, I haven't 'seen' those patterns. What is your point mentioning those patterns?

elaborate.

say something of value, that's all I asked.