The Blonder Tongue AM-60-860 SAP Stereo/SAP Agile Modulator is an analog audio/video modulator equipped with a stereo primary audio and a SAP (Secondary Audio Program) input. An Emergency Alert System (EAS) or alternate IF (Intermediate Frequency) input is also provided. The modulator provides audio and video modulated RF carriers on any NTSC CATV, VHF or UHF channel in the frequency range from 54 to 860 MHz. The unit is compatible with any standard audio/video source such as satellite receivers, television cameras, video tape recorders, or television demodulators.