Clear-Com Tempest900 - Manual (Page 69)

63 Tempest®900 2-Channel Wireless Intercom System
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 Accu-Sync is being employed.
• Physical location of BaseStation antennas (either on BaseStations or on Transceivers).
• Physical location of the BeltStations.
• Specific hopping patterns selected.
• Environment (wide open, reflective, 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 Accu-Sync 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 configuration should be set up to ensure each system’s hopping patterns are configured 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 reflective surfaces tend to be the most
difficult for digital wireless communication systems due to the prevalence of inter-symbol interference.
With all factors listed above being favorable, a maximum of 5 Tempest systems, each with five BeltStations (in Normal
Mode), may be collocated with minimal or no user-perceived impact on system range or performance.
The addition of one or more adverse conditions will limit the number, effectiveness and range of collocated systems in any
given environment proportionally to the extent of the adverse condition(s).