Description of the radar set, tactical-technical characteristics
Figure 1: AN/SPN-11
|frequency:||9 320 … 9 430 MHz
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):||1 000 Hz|
|pulsewidth (τ):||0.4 µs|
|peak power:||30 kW|
|average power:||12 W|
|instrumented range:||20 NM (≙ 37 km)|
|hits per scan:|
|antenna rotation:||17 rpm|
The Radar Set AN/SPN-11 was an X-Band shipboard navigational aid which provided position data on vessels and landmarks that are not visible because of fog or darkness. The radar was a compact equipment designed for installation aboard small vessels for short range navigational use that utilizes a horn-fed parabolic section reflector antenna. The self-excited transmitter used an air-cooled magnetron of standard 725-A type. It was modulated by a type 4C35 hydrogen thyratron.
The echoe signals are shown on a small PPI-scope with a 7 inch cathode ray tube.
- Manual Radar Sets AN/SPN-11, Installation and Operation, TM-11-1335, December 1954
- Manual Radar Sets AN/SPN-11, Field maintenance, TM-11-1535, December 1954
- Catalogue of Electronic Equipment,- NavShips 900,116, October 1952