Description of the radar set, tactical-technical characteristics
Figure 1: Antenna AS-653/APN-59
|frequency:||9 375 MHz ( X-Band)|
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):||180, 350, 1 025 and 2 000 Hz|
|pulsewidth (τ):||4.5, 2.35, 0.8 and 0.35 µs|
|peak power:||58 … 75 kW|
|instrumented range:||240 NM (≙ 444 km)|
|beamwidth:||β =3°; ε =5°|
|hits per scan:|
The AN/APN-59 is an older navigation, search and weather radar, formerly used in C-130, C-135, B-57, C-133, C-141 and KC-97. The radar operates in X-Band and replaced the former AN/APS-38 units.
The reflector of the antenna was divided in an upper and a cahngeable lower half. The lower part could be exchanged by another formed lower half to provide different antenna patterns depending on the task: a thin pencil beam for long range search and weather reconnaissance, and a wider beam for navigation and overview at close range.
- Military Standardization Handbook United States Radar Equipment Manual TM 11-487C-1 1965, p. 737ff