Clear-Com TEMPEST 2400 - Page 15

9 Tempest®2400 2-Channel Wireless Intercom System
With 2xTX technology, each audio packet is transmied twice, each on one of two consecuve hops. The loss of one packet
transmission in a harsh RF environment is common. However, because of the quasi-orthogonal frequency relaonship of
the consecuve redundant packet transmission, the potenal for loss of any single audio packet (2 consecuve data packet
transmissions) is dramacally reduced. In addion, each packet transmission is sent out from dierent antennas. This
unique approach enables Tempest to ulize spaal diversity, frequency diversity, me diversity and polarizaon diversity.
The 2-channel product does not operate with spaal or polar diversity due to the fact it uses a single antenna during
operaon.
Transmission redundancy and the incorporaon of various diversity techniques provide an RF system that is robust and
reliable under greatly varying operaonal condions. Because of this inherent design, Tempest delivers superior operaonal
range and greater levels of interference and mul path fade rejecon. Covering extremely large areas or mulple coverage
locaons can be problemac with tradional wireless intercom systems. Tempest ulizes dierent roaming features that
allow it to “roam” from one coverage zone to another. When a dierent BaseStaon is selected, the hopping paern and
key code of the BeltStaon is synchronized to the selected BaseStaon and the BeltStaon logs into the BaseStaon.
Audio latency is a crical factor in all digital systems. The hop duraon in Tempest is intenonally kept very short - under
5ms. This short hop duraon limits the amount of data that may be lost in any one hop. More importantly, it reduces system
latency, which can cause undesirable echo. Total one-way (BeltStaon to BaseStaon) system latency is less than 50ms.
Even with this short system latency, unwanted and distracng echo will occur when interfacing with hard wired party-line
intercom systems unless echo-reducon technology is implemented. Echo is primarily the result of ineciencies in the
conversion of the two-wire signal. This condion exists in analog systems as well, but it does not cause unwanted echo
because there is no system latency delay. Tempest uses advanced echo-cancellaon algorithms to eliminate this echo.
Wireless intercom systems are oen used in high-noise environments that require special design consideraon for eecve
operaon. Tempest operates extremely well even in very high ambient noise levels. This is primarily due to specic design
criteria which allow Tempest to achieve an audio dynamic range of greater than 94dB. This is more than double that of
most other digital wireless communicaon systems. This design makes Tempest ideal for use at sporng venues, concerts
and other events where unwanted noise levels are high.
Tempest oers a host of features and technology to ensure that it performs well in almost all producon environments
virtually anywhere in the world with no licensing requirements or fees.