KWBY (940 AM) is a commercial radio station broadcasting a Regional Mexican format.
But to protect other stations on 940 AM from interference, at night it greatly reduces power to 200 watts.
It began as a daytimer station, powered from dawn to dusk at 250 watts but required to go off the air at night.
It aired a middle of the road (MOR) format of popular music, news and sports.
It later switched to Regional Mexican music with Spanish-language programming for Oregon's growing Hispanic population.