By Rezin E. Pidgeon, Jr., Scientific-Atlanta, Inc.
A summary of extensive tests of a 400 MHz, two-way sub-split distribution network is given. Data includes noise performance, frequency response, and distortion measurements. Subjective evaluations of the television picture quality are also given.
The distribution system consists of a 20 amplifier trunk cascade and a bridger, taps and line extender. Each station was fitted with standard equipment and accessories as would be encountered in a typical field installation. The entire distribution system was installed in an environmental chamber and tests were performed from -40 F to 140 F.
A complete TV headend system with 54 forward and four reverse channels fed the distribution network. Television signals were obtained off 'the air, from satellite video receivers and test generators. Tests were conducted for standard and harmonically-related-carrier (HRC) frequency assignments. Of particular interest is the comparison of performance when phase locked and non-phase locked.