Most dehydrators run between 120-140 degrees. At temperatures as low as 145F the meat cooks. Cooked meat only lasts 3-4 days when refrigerated, no more than 4 hours at room temperature before it is unsafe.
http://www.foodsafety.gov/keep/charts/mintemp.html
Natives dried the meat in the sun. No cooking. Early pioneers did the same. Dried meat will last for months at room temperature as long as it is kept dry. Solar methods of drying, even with fancy setups that collect solar energy over large areas, max out at about 120F.
http://www.fao.org/docrep/010/ai407e/ai407e18.htm
I imagine that "cooking" dried meat won't actually cook it. Moisture is required for normal cooking. Once dried the meat shouldn't be transformed the same way it would if fresh.
But since jerky has been made for centuries using only the sun for drying, I tend to think that will be enough. Of course salting speeds it up (and adds flavor). Smoking keeps insects away (and adds flavor). But if higher temperatures were required I think our ancestors wouldn't have survived and we wouldn't be discussing this right now.
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