Our older TETRA radios have a programmable field to tell the GPS chip which week cycle we are in. Although this affects all electronics that use GPS chips, the lifecycle of two-way radio products is long and they are frequently used with GPS, so two-way radio customers may be disproportionately impacted. Older GPS chips are not able to tell the difference between week cycles and so may run into problems after 6 April. ![]() Our latest TETRA radios use these modern chips. ![]() Modern GPS chip designers have put software into their receivers that take this rollover into account, and will compare the week number with external sources to work out the true date. This happened for the first time on and is due to happen again on. Every 1024 weeks, this week counter resets to zero. To save repeatedly broadcasting redundant information, GPS satellites send a week number instead of broadcasting the full date. GPS satellites work by continually broadcasting the time and date.
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