Thorsten Wahl wrote:Note on Mannheim
M used (As far as i interprete the description in the service regulation) pulse compression
Indeed the German use of coherent techniques was one the reasons why German radar development took the course it did, which was different from the Allies-at least during the war.
For example, Seetakt originally had a magnetron transmitter but it had to be dropped in favor of triodes because the fine ranging system would not work properly with the frequency instabilities of magnetrons. Seetakt used a central impulse geraete that marked both the transmitted and the echo pulses according to a master oscillator. Time was measured by comparing the phase of the echo pulses to that of the master oscillation. Any radar systems engineer today would instantly recognize this as a coherent technique to improve discrimination for range without resorting to very short pulse widths.
During the Cold War it became apparent that the west needed the West German radar expertize to stay ahead of the Soviets. A treaty was signed in Paris in 1955 that allowed West German companies like Siemens and Telefunken and AEG to ressume radar R&D. The West German firms quickly became recognized as the leaders in development of advanced coherent techniques such as pulse compression.