Talk:Plan position indicator

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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)[reply]

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)[reply]

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)[reply]