Original sentence: After the analog television shutdown and digital conversion, which is tentatively scheduled to take place on August 31, 2011 , CHEK-TV was required to begin digital broadcasts on its current assigned channel number, 49, however, depending on whether it will continue beyond the August 31, 2009 sign-off barring last-minute details, should the digital signal sign-on before the analog shut off date, the station will broadcast on channel 43 -- if the station does shut down by that date, the allocations for these frequencies will become open for future stations.As of September 2008, CHEK-TV has not yet begun broadcasting in digital
Edited sentence: After the analog television shutdown and digital conversion, which is tentatively scheduled to take place on August 31, 2011, CHEK-TV was required to begin digital broadcasts on its current assigned channel number, 49.As of August 2009, CHEK-TV has not yet begun to broadcast in digital, and is not expected to begin such broadcasts before its August 31 signoff, having neither applied for nor received authority to do so.If the station does shut down, these allocations will become open for other future stations.In the unlikely event that the station continues operation past August 2009 and begins digital transmission before the analog shut-off date, the station will broadcast on channel 43