RDR 1400C SAR and Weather Radar
Description of the radar set, tactical-technical characteristics
|frequency:||9375 MHz ±5 MHz|
(SAR and Wx modes)
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):||800 Hz or 200 Hz|
|pulsewidth (τ):||2.35 or 0.5 µsec|
|peak power:||10 kW|
|instrumented range:||240 NM (≙ 444 km)|
|hits per scan:|
RDR 1400C weather and search-and-rescue radar was designed for fixed or rotary wing aircraft engaged in patrol, search and rescue missions, and for transporting personnel and equipment to remote sites (off-shore oil rigs etc.) The lightweight digital X-Band radar got the designator AN/APN-239 in the American JETDS . The RDR 1400C color vision weather radar system is manufactured by Telephonics (originally by Bendix/King) and is e.g. used in Sikorsky HH-60G, MH-60G.
RDR 1400C Color vision Weather Radar System provides five primary modes of operation: 2 conventional weather avoidance modes, and 3 air-to-surface and detection modes:
- Search 1 incorporates special sea clutter rejection circuitry to help detect small boats or buoys down to a minimum range of 300 yards.
- Search 2 is designed for precision ground mapping, where high target resolution is important.
- Search 3 mode includes normal ground mapping and can also be used to detect and track prominent land objects and coastlines.
The RDR 1400C also has the capability to receive signals from both standard 2-pulse beacon transponders and the DO-172 6-pulse transponders.
The primary system components of weather radar system are Receiver – Transmitter unit, Radar Control panel, Antenna Drive & Antenna Array and Navigation concentrator. The system is available with one of three flat-plate arrays of different diameter: AA-1218A (10" or 25 cm), AA-4518A (12" or 30 cm), and AA-5518A (10" or 45 cm). The Radar Antenna Drive Unit (DA-1203A) allows pitch/roll stabilization and scans of 120 deg. or 60 deg. sector. The basic aircraft inputs for this radar is 28 V DC, 115 V AC and A/C Gyro inputs. The RDR 1400C converts radar data into ARINC 708 control bus using an ARINC 429 interface.