I have a Flymo 1200R robotic grass lawn mower.
The auto mower detects the boundary position of the edge of the lawn through a low voltage electrical wire that is buried close to the lawn edge which emits some sort of electrical field that the auto mower detects.
This boundary wire runs around the edge of the lawn to contain the mower within the desired grass cutting area.
Boundary wire is about 210 meters long.
Wire breaks in this boundary wire stop the system working.
One way the wire can break is if a rabbit, for example, digs a hole over the boundary wire and then chews through the wire. The mower will then stop working.
Finding the location of a break can be a long, long, task involving lots of digging in different places where the wire is buried.
This boundary wire emits some sort of electrical field or radio signal while the auto mower is mowing. I am unable to ascertain what frequency is emitted after a fairly extensive google search and youtube search.
I have tried moving round the perimiter of the boundary wire, with an am radio, set to a few different frequencies, while one end of the boundary wire is disconnected from the mower docking station, and the other is still connected and transmitting, but this did not pick up any signal, from the wire at any location. This method seems to work for some people as a youtube search can show.
I can disconnect both ends of this boundary wire from the mower docking station and pulse my own signal if need be to aid detection.
Can anyone recommend a low cost signal generator and detector kit, or other method to easily detect the location of the break in the wire.