It is actually a worse condemnation on german radar directed AAA as Brit bombers were generally 7-12K Lower which should give AAA a better probability of a hit.
1944 was a low point for German radar, as Wurzburg was being succesfully jammed when confronted by formations of aircraft dropping tons of window and carrrying in some cases hundreds of noise jammers kniwn as "carpet".
However when the radar was not degraded by jamming it was very deadly, providing highly accurate range data to FLAK computers, locating the target and either targeting it directly to within a faction of a degree or allowing its illumination for engagement by optical techniques.
The first problem was Windows, this was overcome with a series of coherant pulse doppler circuits, however some time latter "Carpet" noise jamming laid the system low again as the stable frequencies reqiured for pulse dopper were not compatible with the freqency changing methods needed for avoiding noise jamming.
A circuit called k-laus succeded in late 44 or 1945 in recovering use of radar on Wurzburg Riesse and Mannhiem radars, but it was too late for much use.
the 54cm wavelenth over a 3m dish used on Wruzburg-D and Mannheim produced a fairly wide beam, had the Germans used 9cm microwaves their beams would have been 6 time narrower and intercepted 36 times less windows and noise. The abandonment of the microwave radar program in 1942 (apart from one naval radar FuMO 231 Euklid) disrupted even the recovery of the allied technology.
Microwave radars should have been deploying widely from mid 1944 however bombing destroyed both the Sanitaz company' factory making the tubes and latter the Haraeous vacuum casting company making the magnets putting the program of producing 100 microwave radars per month months behined.
K-laus did overcome the problem, as did new tubes that increased pulse power from 8kW to 120kW (Wurzburg-Riesses Gigant) to burn through jamming. What was needed was microaves or a halving of wavelenth as had been originally planned.
The LD7 ceramic disk triode tubes developed by the Germans continued to be copied, in exact form, and used in Soviet era radars all through the 70;s.
These German microave tubes, disk triodes were not vapourware. They were tested in a 5kW radar called Eisbaer in 1941 and produced a 55kW naval radar in 1944. The tubes could produce 20kW pulse at 9cm. The version to produce the 120kW for the Manheim-K LD11 existed.
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