The Cabletronix CT-SFMM is a professional quality, channelized, heterodyne audio/video SAW filtered micro modulator. The unit provides a mono audio and video modulated RF carrier output on any single CATV channel from 2-13 & 14-88 (A-ZZZ). The CT-SFMM is ideal for placing audio and video onto any unused CATV channel. Different standard audio/video sources, such as satellite receivers, television cameras, video tape recorders, or television demodulators can be used. The CT-SFMM takes baseband audio and video and modulates these signals onto the desired output channel. The heterodyne conversion process used in the CT-SFMM employs a crystal referenced, PLL synthesized local oscillator that guarantees a rock solid, nodrift output for the life of the modulator. The CT-SFMM also meets FCC Docket 21006 aeronautical frequency offset requirements. The modulator accepts standard composite video in the range of 0.7 to 2.5 V p-p