Are we using magneto phones with a local battery? Or is the battery supplied at the Sheepscot end? How far can we go with our cable? How many volts will we have by the time we get to Trout Creek? I'm guessing that it's 18 gauge twisted pair direct burial? So we're up to about 90 ohms. It looks like a phone will work as long as it is getting between 6 and 12 volts at about 30 milliamps. So if we supply 12v, by the time it gets to Trout Creek, it will be 12 - 90 * .030, or 9.3V. Should be plenty.