The use of the magnetron in the transmitters
also meant that more advanced receivers had to be developed
to complement them.
By 12th August 1940 the group had succeeded in bouncing
a 10 cm echo off of the ancient Norman chapel nearby
on St Aldhelm's Head. Eleven months later the first
10 cm operational systems were in use with the Navy.
Airborne interception (AI) work continued apace and
meanwhile, on 18th October 1940, the first true ground
controlled interceptions (GCI) took place at Durrington
and a further 5 units were installed by Christmas. Whilst
the system showed great promise, there were teething
problems with it and it was not until the spring of
1941 that the system began to improve the detection
(and subsequent enemy destruction) rates.
There was yet another invention which coincided with
these developments at Worth Matravers
.the Plan
Position Indicator or 'PPI'.
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