Which type of deflection coils is used most often in radar systems?

In radar systems, fixed coils are commonly used for deflection purposes. Fixed coils provide a stable magnetic field that helps in controlling and directing the electron beam within the radar display. This stability is crucial in radar applications, where precise measurement and consistent tracking of targets are essential for effective operation.

The use of fixed coils allows for reliable performance since the magnetic field strength and orientation do not change over time or with movement, ensuring that the deflection of the electron beam remains consistent. This is particularly important in radar systems, where any variation in deflection could lead to inaccurate displays and misinterpretation of data.

Additionally, the design of radar systems often requires a controlled environment where fixed deflection is essential for accurate resolution and detection of targets. The other types of coils mentioned do not commonly meet the stringent operational requirements needed in radar systems for stable and consistent performance.