H.F. oblique sounding measurements over a 6700km temperate-latitude path

Results of oblique soundings over a path from Delhi, India to Slough, England are presented. The modes of propagation are often ill-defined, but the maximum observed frequencies agree well with those deduced from measured ionospheric conditions at points along the path, using either the two-control-point method or a ray-tracing process. The study includes a discussion of measured angles of elevation and multipath time dispersions.