Robin Marshall, former New York City WWFS-FM (102.7) “Fresh” DJ and recent author of “Is This Thing On?” joins Greater Media’s hot AC WLNK-FM (107.9) in Charlotte, North Carolina for weekends … Washington, DC’s WJFK-FM (106.7) mid-afternoon sports talk co-host and former NFL star LaVar Arrington will write a sports blog called “Hard Hits with LaVar”, for the Washington Post … San Juan, Puerto Rico’s WIAC-FM (102.5) “Toca de To” receives FCC approval to change its call letters to WTOK-FM – Discuss it … Pittsburgh’s KDKA-AM (1020) weekend overnight personality Charles Reichblum, (a.k.a. Dr Knowledge) is going national, as parent company CBS Radio will syndicate a 60-second “Knowledge in a Nutshell Minute,” in 30 markets from Boston to Hilo, Hawaii … Karen Cote, longtime Monticello Media GSM in Charlottesville, Virginia, has resigned. No replacement has been named … Clear Channel’s KTOK-AM (1000) in Oklahoma City, Oklahoma adds the “Eggman” for afternoons, following the syndicated Sean Hannity on the “Newsradio 1000” schedule … University of Evansville Purple Aces basketball, baseball and soccer radio voice Brandon Gaudin is the new play-by-play radio voice for Butler University basketball, his alma mater, The games air on “Fan” WFNI (1070) in Indianapolis..