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A
drawing made, I think in May 1941, of the Cregneas Type 2 CHL radar PPI
display. Of interest are the large 'permanent echoes' from the Mountains
of Mourne, Lake District and Snowdonia mountains. Also the quite
large area in the centre that is unusable, possibly from cathode ray tube
burnout. The display is overlaid with a coastline outline and also
the reporting grid. Click image for a comparison with the much later
Ronaldsway radar.
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