It’s always the same - after the installation of a base station for cellular networks or a telecommunication network node, there are doubts during the initial operation. Of all the test devices, which one is the most accurate?

Even with high performance measurement systems, the results of different devices vary because their oscillators, with performance of 10E-6 to 10E-9, are not absolute. In most cases, some time has passed since they were last calibrated.

MEINBERG Funkuhren (Radio Clocks) of Bad Pyrmont, Germany has developed a portable Rubidium with integrated GPS receiver – the Model GRP, for GPS-receiver Rubidium Portable. This compact unit contains a rubidium-atomic frequency standard, the GPS module GPS167SV, a power supply unit, and output amplifier cards for 5.0 MHz, 10.0 MHz, 1.544 MHz/2.048 MHz and 1.544 Mbits/2.048 Mbits (T1 or E1 choice is switch selectable).

The reference frequencies of the Model GRP (with accuracy of better than 1.5x10E-11 from the Rubidium, and better than 2x10E-12 when locked to the GPS receiver) make it possible to synchronize multiple test and measurement devices – everyone is on the same uniform standard reference. The results of the measurements of all devices can be taken for absolute.

The Model GRP can be used as a calibration reference in the laboratory and in the field. The rubidium oscillator and the eventually existing offset is calibrated automatically thanks to the cesium primary standards in the GPS satellites, whose time is ultimately referenced to UTC(USNO) - Universal Coordinated Time via the atomic clocks of the United States Naval Observatory.

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