Commercial video modulator is designed to accept composite NTSC video and audio inputs from a satellite receiver, video server or similar source.VM2551 features front panel video and audio over-modulation indicators and level controls to permit easy setup of modulation levels. The use of a superior SAW filter in the IF circuitry allows adjacent channel operation when used with other modulators or signal sources. A composite IF loop following the SAW filter and before signal conversion to the final RF output channel allows the insertion of scrambling equipment or an IF switch to provide switchover for EAS operation.