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Thanks everybody. The tracker is rated to work from 3.6v to 4.5v.
I used to use 3 AAs =4.5v, never rechargeables, then switched to the laptop as a power source. I used the cable that is used to transfer images from the camera to a laptop because the sockets on the laptop and tracker matched the USB and apparently Mini USB fittings on the cable, however on closer
inspection I have discovered that the plug and socket at the tracker end of the cable whilst superficially the same are in fact different internally, so I think that is the problem; the moral of the story is to never assume anything.
I'll get a new Mini USB cable and see if that fixes the problem.
Incidentally, this is the later model that is designed to run on rechargeables,
alkalines, or an external 4.5v power source; the previous model was not
equipped for external power. Yes I am lucky that it still works.
Thanks again.
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