interference. Additionally, be sure that there are no potentially
interfering signals around the frequencies used by the R450 DC, both
transmit or receive. The overall noise level could potentially reduce
the sensitivity of the R450 DC or MIU receivers. A recommended
receiver is the Icom ICPCR1500 which includes a PC interface. A
Rohde & Schwarz FSH3.03 or FSH3.23 spectrum analyzer is also
acceptable.
Problems can occur from a number of sources. Some common problems
include the following:
l
Improper installation, for example, loose connectors. Refer to "RF
Antenna Installation" in Appendix A to confirm the correct
installation procedures.
CAUTION: You must provide Appendix A to antenna
contractors prior to installation. Failure to follow these
procedures can result in poor system performance.
l
Local cable systems having leaks in the cables and amplifiers can
degrade the performance of the R450 System.
l
Local businesses and factories can have equipment that raises the
ambient noise level, reducing the ability of the R450 DC to hear
MIUs.
l
Local residences and businesses can have equipment that interferes
with the R450 System.
Site surveys often find these problems but cannot detect intermittent,
factory shift-related, or other time-specific sources of interference.
Being in close proximity to a high-power commercial broadcast
antenna produces a unique set of problems. Loose or badly corroded
hardware on or near the site can cause signals from the R450 DC or
other transmitters near the site to combine with the broadcast signal
and produce interfering signals. Incorrectly installed antennas and feed
lines can also cause similar problems. The R450 DC and other local
transmitters themselves can also be a source of re-radiated interference.
Additional equipment that your installer can recommend can help
control these issues.
Terrain and the types of buildings in the area can affect the
performance of the R450 System. Hilly or rolling terrain as well as tall
buildings can make it difficult to receive even local MIUs. Placement
of the MIUs (wall mount and pit style) can be critical in some areas.
Additional R450 DCs that can supplement the problem areas can be
the best solution in these situations.
R450 Data Collector Installation and Maintenance Guide
7
Chapter 1: Product Description
Summary of Contents for R450
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