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RDR 1400C SAR and Weather Radar

Description of the radar set, tactical-technical characteristics

Figure 1: RDR-1400C Search and Rescue, and Weather Avoidance Radar System
© 2005 Telephonics

frequency: 9375 MHz ±5 MHz
(SAR and Wx modes)
9310 MHz
(Beacon mode)
pulse repetition time (PRT):
pulse repetition frequency (PRF): 800 Hz or 200 Hz
pulsewidth (τ): 2.35 or 0.5 µsec
receiving time:
dead time:
peak power: 10 kW
average power:
instrumented range: 240 NM (≙ 444 km)
range resolution:
hits per scan:
antenna rotation:

RDR 1400C

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:

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.

Picture gallery of weather and search-and-rescue radar RDR-1400C

Figure 2: HH-60G Pave Hawk; the radar is under a black radome.

Figure 3: Multifunction Display in HH-60G Pave Hawk