Abstract
Transit times based on the leading edge of pulses transmitted between England and Australia have been measured in the two opposite directions both on the ‘short’ and ‘long’ great circle paths, and on two frequencies. Synchronization was based on UTC time signals at the two ends, with time base stabilisation by the local TV line oscillator frequency. The delay times have been compared with calculated triangular paths for multi-hop, tilt-supported chordal hop as well as a ducted mode between the E- and F-layers. Broadening and rapid waveform changes of pulses make resolution into components very difficult. Observations are given of waveforms after computer averaging of some 2500–5000 pulses. The results are presented largely as experimental data which may be of use to other workers.
Published Version
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