Effects Of Channel Loading On Composite Triple Beat And Cross Modulation (1985)

By Michael G. Ellis and Lee Thompson, Scientific-Atlanta, Inc.

Distortion in CATV amplifiers is due to the non-linearity of the hybrids and is influenced by channel loading and signal level. Composite triple beat and cross modulation, which are both forms of third order distortion, increase 2 dB for every 1 dB increase in signal level assuming that the hybrid is not in compression. An attempt will be made to develop an expression that accurately reflects the change in CTB and cross modulation with respect to channel loading.

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