Fritz X
In early 1944, as the U.S. Army was engaged in the Battle of Anzio, the United Kingdom began to deploy its Type 650 transmitter which employed a different approach to interfering with the FuG 203/230 radio link on a Fritz X, by jamming the Straßburg receiver's intermediate frequency (IF) section. The FuG 230 receiver's IF section operated at a 3 MHz frequency and the Type 650 appears to have been quite successful in interfering with Fritz X ordnance deployments, especially because the operator did not have to attempt to find which of the eighteen selected Kehl-Straßburg command frequencies were in use and then manually tune the jamming transmitter to one of them. The Type 650 automatically defeated the receiver, regardless which radio frequency had been selected for a missile.