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sc98, You are assuming the collar still has battery life... Once weak, the receiver has to be very close to pick up the signal... So at a certain point in the study, the official researchers are no longer able to compile data...
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Took me a while to find it. Some are solar powered and so continue to operate virtually indefinitely, at least relative to the life of the game.
http://www.telemetrysolutions.com/tr...ailed-deer.php
Dropoff mechanism can be installed so that the collar drops off, ideally while still sending data and so can be recovered fairly readily, assuming the critter isn't crossing a swift stream when it drops off.
http://www.lotek.com/dropoff.htm