From my experience with these units (ones made by Gallagher in Hamilton = NZ) in the field (literally) it doesn't appear that there is compensation = for line conditions - the voltage of the pulses would vary depending on a = whole range of things. Anything from 8 kV to 3 kV The amount of grass on the fence, whether or not it was dry, the moisture = in the soil (to make these systems more efficient you need to run an earth = out as well as the hot wire, using each y-standard as a ground spike) The one the family farm used (and was bitten by a few times) ran maybe 10 = - 20 km of wire? >>> olin_piclist@EMBEDINC.COM 08/04/02 08:04AM >>> I would think the two relevant parameters are the spike voltage and duration. The fence leakage resistance and capacitance to ground can vary due to environmental conditions and from installation to installation, so the manufacturer may have added a circuit to adjust the strength of the pulse automatically.=20 ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com=20 -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads