Don't touch that dial: Ed Walker is staying where he is.

The veteran Washington radio announcer last week was lured away from ABC-owned WMAL-AM (630) to join NBC-owned WRC-AM (980) on Oct. 1. This week he has apparently been offered a deal by WMAL that he couldn't refuse.

Walker, according to WMAL operations director James Gallant, will remain at middle-of-the-road WMAL, where his Sunday morning big-band show will not only continue in its current shower of popularity (it attracts an audience share second only to morning kingpins Frank Harden and Jackson Weaver), but will expand by an hour.

"I began thinking about the hours I'd be keeping," Walker said last night of the midnight-to-5 a.m., Monday-through-Friday talk show he was to do for WRC. "And WMAL came back and we started talking again."

Walker, who co-hosts a daily 10 a.m. show for WJLA-TV called "AM Washington," will also do a daily, 12:30-to-3:30 p.m. big-band show for WAMU-FM (385), according to sources at the public radio station.

The WAMU show curtails part of the daily "Measure by Measure" classical program done by Edward Merritt. One source said Merritt will consequently be doing more arts-related interviews and producing for the station's morning information programming.