Looks like a cost-cutting measure. I see a lot of bandwidth reduction used for ESNE (heavy artifacts) Thankfully there's none apparent on KDOC.
Found out about it as I was hoping to record Hawaii Five-O for uploading into Youtube. I wasn't warned about the channel change - they should have put PSA notices that they were going to change the channel lineup. That should be put into the FCC code - whenever a station makes changes to its channel lineup, they should broadcast notices that the channels are changing on their station and that you will need to rescan on the day of the change.
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