Letter/number nicknames, and "rounding off"...

[Sid Schweiger]

>>They IDed as "WDRC-FM and WDRC-FM-HD1."  Why?<<

Because the FCC requires it, although the wording of the revised regulation is subject to a number of interpretations.  This one (ID'ing as you noted) seems to be the method most stations have settled on.

Sid Schweiger
IT Manager, Entercom New England
WAAF/WEEI/WEEI-FM/WKAF/WMKK/WRKO/WVEI/WVEI-FM
20 Guest St / 3d Floor
Brighton MA  02135-2040