Page "V-2" Paragraph 21

Dr. Friedrich Kirchstein of Siemens of Berlin developed the V-2 radio-control for motor-cut-off ().

For velocity measurement, Professor Wolman of Dresden created an alternative of his Doppler tracking system in 1940 – 41, which used a ground signal transponded by the A-4 to measure the velocity of the missile.

By 9 February 1942, Peenemünde engineer de Beek had documented the radio interference area of a V-2 as 10, 000 meters around the “ Firing Point ”, and the first successful A-4 flight on 3 October 1943, used radio control for Brennschluss.

Although Hitler commented on 22 September 1943, that " It is a great load off our minds that we have dispensed with the radio guiding-beam ; now no opening remains for the British to interfere technically with the missile in flight ", about 20 % of the operational V-2 launches were beam-guided.

The Operation Pinguin V-2 offensive began on 8 September 1944, when Lehr-und Versuchsbatterie No. 444 () launched a single rocket guided by a radio beam directed at Paris.

Wreckage of combat V-2s occasionally contained the transponder for velocity and fuel cutoff.