User guide
9 Tempest®24 00 4-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 hardwired 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.