4.2.2 RVP901 IFDR Power, Size, and Mounting Considerations
Table 13 IFDR Installation Considerations
Consideration Description
Communication The IFDR communicates with a host computer through Ethernet. The 10/100/1000 Mbit
physical interface supports 100 Base-T full duplex and Gigabit Ethernet options.
The Auto-MDIX feature eliminates concerns worry about cross-over versus straight cables.
The platform provides support for TCP and UDP packets. The default IP address, shipped
with each system, is 10.0.1.254. The IFDR supports jumbo packets.
Vaisala recommends the UDP packet sizes be set to 8192 on the host
computer.
To comply with industry standards, use a shielded CAT5e cable (certified to 350 MHz), with
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 dierent AC/
Mains.
Cooling
The unit is cooled by direct conduction of heat through the metal chassis. Redundant fans
are attached to supply airflow across the heat sink. The fans power is supplied from the AC
to DC power supply or directly from the DC source.
One side of the RVP901 IFDR serves as a heat sink. The hotter chips mounted on the printed
circuit board are bonded to the heat sink.
Position the RVP901 IFDR so that a minimum of 20 cubic feet per minute of air can freely
convect around it.
If you order RVP901 without fans, you must provide > 20 cubic feet per minute of airflow
across the RVP901 heat sink.
The ambient air temperature should be within a range of -40 ... +50 °C (-40 ... 122 °F) with
DC supply power option and - 40 °C ... +45 °C (-40 °F ... 113°F) with AC supply option.
Filters Reserve mounting space for the external, analog, anti-alias filters.
The 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.
Internal
regulator
Internal regulator is an isolated DC-DC converter taking a 12 ... 36V input and regulating it
down to provide supply the voltages needed by internal circuits.
A ferrite choke around the supply wires, near the terminal strip is also recommended.
Mounting The IFDR is a compact sealed module with dimensions 26.8 cm x 17.6 cm x 4.8 cm (10.5 in x
6.9 in x 1.9 in).
The unit is designed to be mounted on edge, so that the 26.8 cm x 4.8 cm surface is flush
with the back of the receiver cabinet, with a 17.6 cm protrusion into the cabinet.
The unit is typically placed where a traditional LOG receiver, or previous generation RVP IFD,
was installed.
RVP900 User Guide M211322EN-J
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