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The following radio stations broadcast on AM frequency 680 kHz:[1] 680 AM is a North American clear-channel frequency.[2]KNBR and KBRW share Class A status on 680 kHz. WRKO, WPTF, CJOB and CFTR also broadcast on 680 kHz, with 50,000 watts at all times, but are class B.
2 Shortwave uses a combination of AM, VSB, USB and LSB, with some NBFM and CW/morse code (in the case of time signal stations) as well as numerous frequencies, depending on the time of day/night, season, and solar activity level. A reasonably full list from 16 kHz to 27MHz can be found at [1]
3 Regions 1 and 3 also use Region 2's frequencies as well, with 50 to 100 kHz spacing.