Numbered broadcast translators which are moved to another frequency are normally issued new call signs to reflect the updated channel assignment. This is not true of displaced translators using another frequency temporarily under a special technical authority. Although K55KD could retain its call sign while it was displaced temporarily to channel 57 to resolve interference to MediaFLO users, W81AA would have received a new call sign when channel 81 was deleted from the bandplan. On the rare occasion that a station moves back to its original channel, it receives its old call sign (which is not reused by another station).