Recent developments in mobile telecommunication networks offer a possibility for synchronization of mobile equipment. The possibility is explored here. To this end, a network operator is synchronized to the Lithuanian national time and frequency standard over internet via NTP (Network Time Protocol). A mobile testing system (MTS) created is synchronized to the operator's network via a radio modem operating in one of the several different modes. The time scale of the MTS synchronized over the mobile telecommunication network is compared to that of the national standard to evaluate the synchronization accuracy and to find out that the most suitable operating mode for the modem is CSD (Circuit Switched Data), which is likely due to its dedicated and symmetrical nature.

Oscillation frequency of a GaN-based surface acoustic wave delay-line oscillator is investigated in the temperature range from 20• C to +38• C, with and without UV illumination. The results imply that such an oscillator may be used for temperature sensing with the resolution of up to 1 mK. On the other hand, as the frequency downshift due to UV illumination does not exhibit a signicant dependence on temperature, it may be expected that such a system, when used as a UV sensor, would not require applying a correction for temperature.

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