Description of the radar set, tactical-technical characteristics
Figure 1: Antena AS-205A of AN/APS-4
|frequency:||9 375 ± 55 MHz
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):||600 and 1 000 Hz|
|pulsewidth (τ):||0.6 and 2.1 µs|
|peak power:||40 kW|
|instrumented range:||100 NM (≙ 185 km)|
|hits per scan:|
The AN/APS-4 was a pod-mounted operating in the X-Band search radar suitable for either airborne interception or air-to-surface-vessel roles. It is a further development from the AN/APS-3, in which particular attention was paid to lightweight construction. The parabolic antenna with a diameter of 14 inch was fed with a cutler feed. The antenna can be moved 75 degrees on either side of centre for air intercept applications and 30 degrees above and below centre for surface search of vessels or aircraft attacking from above.
APS-4 was used in C-47, C-117, P-38J, P-82D/F/H, AD, XBT2C-1, F4U-4E, F6F-3E/5E, SB2C-5, SBF-4E, TBF-3, and TBM-3S. The British designation is AI Mk ⅩⅤ.