Exalt Communications, Inc.
r-series
Installation and Management Manual
5000007 (ETSI)
73
2007-02-12 (draft)
existing interference. In addition, the occupied bandwidth of the radio can be reduced. This,
along with re-tuning, can be very effective, however throughput is reduced.
Repositioning the antenna and/or changing polarization, or upgrading the antenna to a higher
gain, and/or using a high-performance antenna, are all secondary means that can be used. It may
be necessary to perform combinations of both radio changes (retuning, occupied bandwidth
reduction) and antenna system changes (position, polarization, upgrade).
The EX-4.9r radio operates under licensed regulations. If interference is suspected, the local
frequency coordination organization, or other users of the spectrum should be consulted before
re-tuning the radio to a different frequency channel.
Path Obstruction
A path obstruction is defined as an object, such as a building or tree, impeding the proper path of
the radio system. If the system design was proper at the time of installation and issues arise at a
later date, an updated path profile and survey may be necessary to identify changes in path
clearance.
Misaligned Antenna
At the time of initial installation, it is critical that the antennas at each end are properly aligned
and that the designed RSL is achieved. However, antennas may become misaligned due to high
winds, changes in the guy-wiring systems keeping the antenna mast stable, or loosening of the
antenna mounting hardware. A reduction in the RSL of the link is symptomatic of this condition,
but this condition is not the only condition that results in a reduction of RSL. However, if
conditions occur where the antenna alignment may be suspected, the mechanics must be
inspected and the antennas realigned.
Faulty Antenna
A faulty antenna is rare, but is still a possibility. In some cases, the mechanics of the antenna
feed can get moisture inside, or a bad or weak connection in the pin and connector structure of
the antenna may occur. A VSWR measurement of the antenna connection can be made to verify
this condition.
Improper Grounding
In addition to being a potential human safety issue, improper system grounding is a somewhat
common condition that can cause continuous bit errors or bit errors when metal objects come in
contact with the radio, transmission system, or racking system. If touching the radio causes
errors, grounding is the cause. It can be difficult to identify grounding problems, but a
professional electrician can normally inspect a system and identify if there are deficiencies in the
grounding system.