CREATE TABLE table_77614 ("Call sign" TEXT, "Frequency MHz" TEXT, "City of license" TEXT, "ERP W" FLOAT, "Class" TEXT, "FCC info" TEXT)

Name the call sign for ERP W of 4
SELECT "Call sign" FROM table_77614 WHERE "ERP W" = '4'
SELECT "Call sign" FROM "table_77614" WHERE "ERP W" = '4'