UK GOV/MIL "WinDRM51" variant. Unknown purpose, But link between UK & Cyprus has been found some years ago.
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UK GOV/MIL "WinDRM51" variant, supposed to be idle only, seen on many frequencies in the past, for an unknown purpose yet. But the link between the UK & Cyprus was found some years ago. Credit: Linkz --Cartoonman (talk) 08:59, 18 January 2016 (NZDT)
It is a special case of OFDMOrthogonal Frequency-Division Multiplexing that uses only one of every two symbols.