Engineering Physics Annotation << Back Dispersion Losses Influence on Communication Range Moiseev A.A. Linear losses at power dispersion stipulate for end formulas transformation into transcendent equations solvable by dichotomy method. Here considered such transformation for formulas based on radar equation and on quadratic (interference) Vvedensky formula. These methods allow considering communication range for mutually exclusive situations: – for irradiator with beam antenna; – for irradiator with isotropic antenna. Straight visibility formula takes into account atmospheric refraction only and play part of limiter at using other methods. For numerical calculation here was applied graphical tool LabVIEW. Their analysis shows that at low range straight visibility limit isn’t accomplished and shows itself at range increasing only. Keywords: base location equation, Vvedensky formula, linear losses, straight visibility range, atmospheric refraction, refraction gradient, beam antenna, isotropic antenna, loss reduction, Buger formula, dichotomy method. DOI: 10.25791/infizik.4.2025.1474 Pp. 60-64.