LMS10 versus CV64
The German, so-called Chinese, copy of the famous British CV64 cavity magnetron
Referring to the British postwar TRE report
Transcript
of:
T.R.E (TRE) report T. 1858
My comments
are:
This report shows that Telefunken must have faced considerable difficulties
during the production of the LMS10, which is a (Chinese)copy of the British CV64
cavity magnetron.
TRE proved, that their machining had considerable mechanical shortcomings. This
might well have been owed to the wartime circumstances, as these tested samples
had been produced in late 1944 or in early 1945.
The use of an additional gettering facility, may indicate that Telefunken
encountered sealing difficulties. Our own LMS10 (serial number 0587), like all
other known samples, has a broken glass envelope due to its (brittle) glass
quality.
Three of the tested samples showed, nevertheless, very good parameters and
behaved like CV64.
During the Autumn DEHS meeting of 2005 in England, one of the attendees
mentioned: that the Germans used linear strapping, maybe due to the lack of
understanding of its principle. In my opinion this does not fit with the facts
shown in this TRE report.
Bearing in mind, both photographs of LMS10 and CV64 and given the perfect
parameters of three out of eight LMS10 samples tested, we have to conclude that
his statement does not match with reality. What might have happened is, that the
strapping of CV64 had been individually phase adjusted, whereas the Germans (Telefunken)
employed not adjusted strapping(pre-fab.). The lack of efficiency of several
LMS10 samples, may be owing to incorrect production-techniques (procedures) and
wartime circumstances.
Considering the two photograph, the only instant observation to be made is, that
it seems that the Telefunken LMS10 magnetron-strapping turned(rotated) in an
inverse direction.
Brian Callick mentioned: that the Germans used in contrast a pure copper anode block, which is quite difficult to machine. Bearing in mind the shortage of qualified labour and the structural destruction of Germanies industry (late 1944), there had been, probably, no alternative to increase production quality.
Arthur O. Bauer
Consider also the famous MIT paper on: Strapping technology
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