Tempest 900 - Maximum Number of Collocated Systems

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Tempest900 2-Channel Operating Manual
Maximum Number of Collocated Systems
Factors that affect the maximum number of systems that may be collocated in any given location include:
• The existence and extent of harmful interference caused by in-band external radiators.
• Number of BaseStations.
• Number of BeltStations per BaseStation.
• Whether or not synchronization is being employed.
• Physical location of BaseStation antennas (either on BaseStations or on Transceivers).
• Physical location of the BeltStations.
• Specic hopping patterns selected.
• Environment (wide open, reective, through walls…).
Favorable system conditions include:
• Locations with little or no interference from other 900MHz devices will provide the best opportunity for a large number of collocated
systems.
• Proper use of synchronization resolves potential desensing issues.
• Antennas of any particular system should be separated from every other system’s antennas by at least 10 feet (3 meters) for best
collocated system performance.
• BeltStations operating at similar distances from their respective BaseStation antennas provide the best opportunity for satisfactory
performance of a large number of collocated systems.
• Network Number conguration should be set up to ensure each system’s hopping patterns are congured properly. See the section on
Network Number for more information.
• Environment can play a big role in RF system performance. Every location is different and has its own unique set of challenges.
Generally speaking, locations with very long paths to very reective surfaces tend to be the most difcult for digital wireless
communication systems due to the prevalence of inter-symbol interference.
With all factors listed above being favorable, three to ve Tempest systems (each with ve BeltStations in Normal Mode), may be collocated with
minimal or no user-perceived impact on system range or performance. It is highly recommended to contact your Tempest Applications Engineer
for assistance when collocating more than three BaseStations.
Adverse conditions will limit the number, effectiveness, and range of collocated systems in any given environment.