Talk:Plan position indicator

Untitled
Isnt PPI supposed to mean Plan Polar Indicator? This to distinguish it from the early radar displays only showing targets in one specific direction. Anyone? europrobe 18:22, 1 November 2005 (UTC)


 * Plan Position Indicator is the original TRE (who devised it) meaning and is fairly self-explanatory. The display gives a map-like, ie., a plan display of the target positions relative to the transmitting set. Ian Dunster 11:38, 14 November 2005 (UTC)

Berlin Pre-war
''The PPI display was first used prior to the start of the Second World War in a Jagdschloss experimental radar system outside Berlin. ''

That's funny, as when the Germans managed to retrieve a damaged H2S system from a crashed Stirling (the Rotterdam Gerat) they couldn't work out what the equipment did, as the display indicator had been destroyed. It was only when a working display was recovered some time later from another aircraft, and the combined complete working system set up on the roof of a Berlin Flak tower that the Germans had any idea of what H2S did. If a PPI had been developed in Berlin pre-war then they certainly didn't tell anyone, and if so, one wonders why.

I suspect the writer is confusing the manual Jagdschloss (Hunting Castle) system where female operators shone torches at a map drawn on a frosted glass screen to indicate the targets. —Preceding unsigned comment added by 213.40.250.235 (talk) 20:45, 28 August 2009 (UTC)