What kind of signal in perimeter wire for robomow

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Adro

Joined May 20, 2022
2
Want to pick up an earlier post.
Can anybody give me a hint how the signal in perimeter wire for Robomow look like? Is it AC or DC, what frequency, modulation?
In my case A Gardena Robomow but I guess principle the same?
Just want to learn.
 
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