Occurrence of Local Oscillator Interference on Cable Television Systems

In cable systems with augmented channel capacity, the local oscillators of TV receivers can cause interference between neighbouring subscribers. To avoid the interference, channel off-setting techniques are in effect in cable systems and standards for maximum receiver local oscillator leakage are being implemented. A study, based on a two-subscriber model and on the removal of channel off-setting, has been undertaken to evaluate the maximum overall probability of occurrence of local oscillator interference.