Chris Deacon, G4IFX
At VHF we tend to assume that our signals arrive at the other end with more or less the same polarisation as they left with, whereas at HF it’s commonly believed that polarisation is effectively ‘scrambled’ as the signal goes through the ionosphere. But how many of us know what’s really happening, particularly via sporadic-E which suffers from such dramatic fading? In this session Chris Deacon, G4IFX initially reprises some of the results from his 2016 and 2017 Convention presentations, which showed that the effective polarisation of sporadic-E signals is constantly changing over timescales of seconds to minutes. He then goes on to describe the results of his more recent experiments using new more comprehensive measurement techniques, which are beginning to help us answer key questions about the true nature of Es propagation.

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