Chapter 3 _______________________________________________________ Hardware Installation
VAISALA_______________________________________________________________________ 65
Packaging, on page 343 for a drawing of the power harness needed to
supply power to both the RVP901 and fans.
The IFDR replaces all of the IF receiver components that are found in a
traditional analog receiver system:
- Band Pass Filters
- LOG Receiver
- AFC Circuit
- AGC or IAGC circuit
- Quad Phase Detector
- COHO (on magnetron systems)
- Line drivers for base band video
One of the most time consuming parts of an upgrade is often the removal
of old components. Many customers choose to simply bypass them and
leave them in place. In some cases, there are other receiver modifications
required to match the IFDR signal input specifications. For example, IF
attenuators or an IF amplifier are sometimes required.
You should carefully document and red-line your system schematics to
reflect any changes to the receiver.
3.2.3 IFDR Power, Size, and Mounting
Considerations
The IFDR is designed so that mounting brackets uses the same dimensions
as previous RVP7 and RVP8 generation IFDs. It 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, would be installed.
The IFDR is cooled by direct conduction through its metal enclosure. One
side of the IFDR serves as a heat sink. The hotter chips mounted on the
printed circuit board are bonded to the heat sink. The IFDR should be
positioned, so that a minimum of 20 cubic feet per minute of airflow can
freely convect around it. The ambient air temperature should be within a
NOTE
If you are doing an upgrade of an older system, you may want to consider
purchasing a new STALO, which can make significant improvements in
Doppler performance.
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