A Computer Program for Calculating Effective Interference to TV Service (Computer Program TVINT)

摘要

This report describes a computer program developed by the Propagation Analysis Branch for the calculation of interference to TV service. The report introduces the concept of 'effective interference', which is defined as the joint probability of service and interference, integrated over the area of interest. The program will also perform standard interference calculations, wherein interference contours are based on 50% probability of interference. The program can be used in an interactive mode with user options to calculate the location of any desired service or interference contour, the size of any service or interference area and the net 'effective interference' within any service area. The user also has options to include the effects of receiver filters, receiving antenna cross polarization and front-to-back ratios and terrain roughness. The report includes values for desired-to-undesired ratios and other input parameters for calculating adjacent channel and co-channel TV to TV interference for all bands, and FM interference to TV channel 6 service.