The dual-axis, single-joystick-equipped Funkgerät (FuG 203) Kehl series of radio-control transmitter sets, fitted aboard the launch aircraft, were used to send the control signals to the ordnance, with the ordnance device itself picking up the signals through a Funkgerät (FuG 230) Straßburg receiver after release.
Naval Research Laboratory (NRL) produced the XCJ jamming transmitter, installed aboard the destroyer escorts USS Herbert C. Jones and Frederick C. Davis in late September 1943.
The manually operated jamming system met with some success, though it proved cumbersome and was easily overwhelmed if large numbers of weapons were deployed simultaneously.
The Type 650 automatically defeated the receiver, regardless which radio frequency had been selected for an individual missile, be it Fritz X or Hs 293.
Following several intelligence coups, including a capture of an intact Hs 293 at Anzio and recovery of important Kehl transmitter components from a crashed Heinkel He 177 on Corsica, the Allies were able to develop far more effective countermeasures in time for the invasion of Normandy and Operation Dragoon.