2. Gemini TM Drive-test tool for digital radio networks Gemini is trade mark of Radio Systems Information Ltd

3. Key Features Measurement of speech quality to ITU-T Rec. P.862 Compatible with TETRA radio terminals –Motorola MTM700 –Sepura SRP2000 –Cleartone Survey using up to 4 radios simultaneously Expandable design for large networks Very powerful built-in analysis functions

5. How does Gemini TM work? continuously makes calls between mobile and fixed parts of Gemini call failures logged call setup time logged speech samples sent on uplink & downlink to test speech quality

7. Analysing Results Results displayed as icons on maps –original quality –very poor TETRA quality –poor TETRA quality –standard TETRA quality Following examples show different types of analysis on maps Speech quality measured as Mean Opinion Score

8. Colour indicates audio quality

9. Colour indicates Base Station

10. Colour indicates Signal Strength

11. Poor Coverage Area Lots of handovers, No Service and Call Drops Good Coverage Area All calls completed OK

12. Analysing Results Results displayed on Graphs - almost any parameter can be displayed against any other parameter Following examples show different types of analysis on graphs

17. Gemini TM Antenna Combiner Connect up to 4 TETRA radios to a single antenna in a survey vehicle Meets all ETSI interference requirements

18. Gemini TM Applications Network acceptance Investigating problems Benchmarking network performance Annual performance checks Objective measurements for contractual negotiations