An L1+L5 requirement needs explicit receiver support in the exact handset. A list of satellite systems is not enough to establish dual-frequency GPS. The current R4-T product information reviewed here lists positioning systems but does not confirm L1+L5 reception.
Separate signals from constellations
GPS.gov describes GPS civil signals, including L1 and L5. A purchasing specification should identify the required signals separately from GPS, GLONASS or other constellation names. Do not infer implemented handset capability solely from a general chipset description.
Request the receiver evidence
- Exact device and receiver configuration.
- Supported signal bands and any software requirements.
- Documentation showing that the offered variant implements the requested combination.
- A trial plan tied to the intended navigation or field-recording task.
Evaluate the operational result
Use representative locations and the production app. Record route continuity, delayed fixes or unusable records against an agreed reference and acceptance method. Do not advertise a universal accuracy value from a single observation.
Review the current R4-T specification and request written confirmation if dual-frequency reception is mandatory. This guide contains no receiver test, survey-grade accuracy claim or verified L1+L5 Phonemax configuration.
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