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Today's screenshot shows what are most likely the same echo viewed from three different locations. The vertical scales are not precisely aligned due to processing delays, a problem which can be overcome when the raw receiver data with precision timing is available so that echoes viewed from different stations can be correlated precisely. This is not be possible on the live display.? The echo received at Norman Lockyer is feint and has a positive Doppler shift of more than 20Hz while the same echo viewed from Armagh and NW Hampshire has close to zero Doppler shift. The vertical polarised receiver is seeing a slightly stronger echo than the horizontally polarised receiver in this example.

Brian