LPM-55 Multi System TV Pattern Generator/television signal generator Main technical specificationsBrandMEITOUSHENModel:LPM-55Output ... frequencies, RY color difference, BY color, dynamic small box, anti-white, black and white box, grid lines, grid points, centerline, and the ... eight vertical frequencies were 0,8-1,8-2,8-3,0-3,4-3,8-4,8 MHz8, dynamic small box, there are four ...