fredag 30. mai 2014 15.01.59 UTC+2 skrev Leif Neland følgende:
The boundary wire for my Husqvarna 330x automover is 1200m long, so the
signal is too weak for the mower to properly follow the boundary in and
out.

Husqvarna does not have a signal booster for the 300 series, only the
200 series, neither do they have a secondary signal generator.

I want to boost the signal with an active amplifier, so a schematic
would be helpful.

This signal would feed a loop going around some areas inside the main
loop, which should not be mowed.

I've measured the signal with my dusty 'scope, and the signal seems to
be a digital signal, either 2v or 0v into a 20 ohm loop.

It is 50hz with some code appended to the trailing edge.

I could try to simply use an audio amplifier, but I guess it would be
better if I could replicate the base station.

So a schematic would be helpful.

Leif


--
Husk kￜrelys bagpￜ, hvis din bilfabrikant har taget den idiotiske
beslutning at undlade det.

Hi
My Automower 330x stopped working after a lightning storm august 2015. I delivered it to the supplier, who found that the power supply was defect. They also tested the base station and the robot on a small loop. That worked fine.

Back in my garden I connected all the cables (I have a boundary loop and two guides, about 5-600 m) and the base showed green light. The robot, on the other hand, reported "no loop signal". I tried connecting different wires to AL, AR, G1 and G2 and received a variation of blue and green lights. I have now tested the whole wire system with a 12V battery and a lamp, and all cables are intact.

I have also tested the robot on a small loop, where it works. On a large loop (with a new wire) it reports "no loop signal". Could the problem be that the signal from the base is weakend? Possibly from a nearby lightning strike?

Harald