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1.5.3 DA-1203A Antenna Drive
The DA-1203A Antenna Drive unit scans and stabilizes the flat plate antenna array in 120
°
or 60
°
sectors. The antenna array can consist of several sizes: 10 inch round, 12 inch round, 18 inch round,
and 18 inch by 12 inch rectangular. The RT provides control signals and power supply voltages to
scan the antenna drive.
The antenna drive can receive pitch and roll stabilization signals from either an analog gyro or a
digital AHRS system. If an AHRS system is used, then the digital ARINC 429 pitch and roll
information must be applied to the RT-1601 where the digital data is converted into analog pitch and
roll information used by the DA-1203A.
Where it is inconvenient to make waveguide connections at the top of the antenna (standard
mounting), an inverted version is available which permits making connections at the bottom. This
version has internal wiring changes to accommodate the inverted operation.
1.5.4 CP-113 Radar Control Panel
The CP-113 radar control panel is DZUS mounted to the aircraft panel and provides mode and
control data to the RT-1601 and mode information to the MFD. The controls to the RT consist of
both analog and digital signals. The basic controls consist of RT on/off, modes of operation, antenna
tilt, search gain, and beacon gain.
Depending upon the configuration of the RT, panel color, functions, and back lighting, there are
several versions of the CP-113 radar control panel that can be used within the RDR-1600 radar
system. If the RT-1601 is configured as an NC-104B (-1004), then either a CP-113A or CP-113K
shall be used. When the RT-1601 is configured as an NC-104B (-1005) then a CP-113P shall be
used.
The RDR-1600 may consist of two MFD displays. The MFD system is used to display radar data
and to provide the RT-1601 with range information. The two MFD displays can select separate
ranges, but there can only be one radar control panel in the system. This system will allow for
independent ranges on each display, but both displays will have the same mode, search gain, beacon
gain, and antenna tilt.
The customer-selected MFD system must be compatible with the RDR-1600 radar system. This
system must provide compatible ARINC 429 control and range data, and must be able to correctly
interpret the ARINC 453 radar data information. To determine compliance, contact the MFD system
manufacturer.
1.5.5 Antennas
The RDR-1600 radar system uses flat plate, fixed phased array antennas that are mounted to the
DA-1203A antenna drive assembly. The antenna is used for both transmitting and receiving, and can
be remotely controlled from the tilt control on the radar control panel to any position of beam tilt
between 15
°
above and 15
°
below the horizontal (zero degrees attitude).
The antenna is shipped separately from the DA-1203A and must be assembled by the installation
agency. When using the 18" and 18"x12" antennas, a Mounting Adaptor must be used to provide
