I was tuning around the dial, and I stopped on 680, which is was calling itself "KNBR 1050 AM" on the air. I later checked the station website, which advertises it as "KNBR 680/1050: The Sports Leader."
The callsign of the 1050 signal is actually KTCT, and according to Radio-Locator, the coverage of the 680 signal totally encompasses the coverage area of 1050. Many (but not all shows) are simulcast on both stations. Does anyone know what is happening at that station--are they intending on running both 680 and 1050 in this way indefinitely, or are they just waiting to let the contractual obligations behind some of the shows run out so that they can change formats on one of the two frequencies?