Janet Parshall, a syndicated radio talk-show host and the nation’s pre-eminent female Christian broadcaster, is leaving the Salem Radio Network this weekend to start up a new show with the Chicago-based Moody Broadcasting Network.  The last day on the air for “Janet Parshall’s America” will be a Friday rebroadcast.  Parshall recorded her last live show Monday, when she announced she was leaving. Officials at Dallas based Salem Radio, the nation’s largest commercial Christian network, refused to say why they did not renew her contract. Janet Parshall’s “America” reached 3 million listeners on 265 stations, about 100 of them commercial stations.