USER’S MANUAL__________________________________________________________________
66 __________________________________________________________________ M211322EN-D
range of -40°C to +50°C (-40°F to 122°F). Redundant fans provide the
needed airflow.
The power module is separate unit. The IFDR is delivered with the power
supply module attached to the IFDR mechanical housing. The power
supply module can be removed and mounted nearby in the radar cabinet.
The power supply, fans, and bracket add 8.4 cm (3.3 in) of overall width to
the receiver module. Power modules are available for 100 VAC to 240
VAC at 47 Hz to 63 Hz or 18 VDC to 36 VDC. The AC power supply is a
low noise, low ripple, auto-switching unit. The DC input voltage may be
unregulated. If DC voltage is selected as an option; three different fan
assemblies are available. These fan options allow DC voltages from 12
VDC to 18, 18 VDC to 28 VDC, and 28 VDC to 36 VDC.
The IFDR has an internal regulator to supply the various digital circuits the
voltages need. The internal regulated power modules are sized to provide
several Watts more than is required by the RVP901. A ferrite choke around
the supply wires, near the terminal strip, is also recommended.
Mounting space should also be reserved for the external, analog, anti-alias
filters. These filters can be mounted in the radar cabinet, or they can be
attached directly to the IFDR on the opposite side of the power supply. The
filters and mounting bracket add 2.0 cm (0.8 in) of overall width.
The IFDR communicates with a host computer through Ethernet. The
10/100/1000 Mbit physical interface supports full and half duplex
configurations. It has an Auto-MDIX feature, which eliminates the need to
worry about cross-over versus straight cables. The platform provides
support for both TCP and UDP packets. The default IP address, shipped
with each system, is 10.0.1.254. The IFDR supports jumbo packets.
Vaisala recommends using a shielded CAT5e cable (certified to ≥
350 MHz), having shielded RJ45 plugs on each end. Ensure the Ethernet
connectors on the host computer and IFDR make contact with the metal on
the shielded cable, which provides DC return path. This design prevents
ground loop currents from flowing between units, even when they are
plugged into different AC/Mains.
NOTE
Vaisala recommends the UDP packet sizes be set to 8192 on the host
computer.
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