Wikipedia
XEWW-AM is the call letters of a radio station operating on 690 AM and licensed to the Tijuana/ Rosarito area of Baja California, Mexico, with additional studio facilities in Burbank, California, United States.
It is a high-powered station, with its 77,500 watt daytime signal sometimes reaching as far as the middle of the San Joaquin Valley, but otherwise covering nearly all of Southern California and most of Baja California. It operates with 50,000 watts at night as is required by the "Rio" treaty. This same treaty would normally allow XEWW to operate with a daytime signal of 100,000 watts. However, 77,500 watts was apparently selected as this power sends the equivalent of the station's former 50,000 day power (from its original Tijuana site, since demolished) towards Los Angeles without also increasing its prohibited overlap with 670 and 710 kHz in Los Angeles (from its present Rosarito site). Had it chosen to operate at 100,000 watts days would have required a modified daytime directional antenna at Rosarito (the night directional antenna at Rosarito would not need to be modified).
Its current format is Spanish-language talk radio under the brand name W Radio. It primarily serves the Los Angeles area, even though the station has a stronger signal in San Diego, due to its close proximity to Rosarito, and a dramatically stronger signal south of the Rosarito site, towards Baja California.
It is the flagship station of C.D. Guadalajara. They had CD Chivas USA of Major League Soccer as its station up to 2014.
XEWW is also the overflow station for English-language radio broadcasts of USC Trojans football and basketball games when there is a conflict with another game that airs on KSPN.