A broadcast translator is a low-powered FM radio station that retransmits the programming of a parent station that operates on a different frequency. Translators are not allowed to originate programming, and were originally designed to extend the coverage area of a primary analog FM station. In some cases a single station has multiple translators covering various geographical areas. Call signs for translators start with a "K" in the western United States, and a "W" in the east, followed by the three-digit FM channel number assigned to its operating frequency, and closing with two sequentially assigned letters.