NTSC/PAL Composite Analog Input Module (OP73A) Ideal for broadcast and field acquisition professionals, the option 73A adds expansion capabilities to accommodate analog NTSC/PAL composite inputs. Two composite inputs (auto-sensing) are provided and the selected input is fed to a monitoring output. Monitoring functions include waveform, vector and picture displays. SCH measurement is also provided for both NTSC and PAL and full line selection capabilities allow monitoring on a line-by-line basis.