Slice meat into long strips, 1 inch wide and 1/8 inch thick, cutting with the grain.
In a large releasable plastic bag, combine soy sauce, Worcestershire sauce, Liquid Smoke, ketchup, pepper, garlic powder, onion salt and salt. Place meat in bag and seal shut. Refrigerate overnight. Knead occasionally to evenly distribute marinade. Place in dehydrator with a tray on the level below and dehydrate for about 8 hours.
Oven instructions: Preheat oven to 160°F. Place a pan on the bottom of oven to catch drips, or line with aluminum foil. Place meat strips on a rack so that they do not touch each other, and dehydrate for 6 to 8 hours in the oven, or until desired consistency is achieved.
Let cool and store in the refrigerator.