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GPS Tuning can be used during Test Box installation and whenever the GPS antenna needs to be moved. In this mode one measurement is taken every second. This enables real time observation of reception conditions while the antenna is being installed. No test traffic measurements can be taken when this is active. During normal operations GPS data can be viewed using GPS Status. The Test Box will be shipped with the GPS Tuning mode turned on in order to assist with antenna installation. Once measurements start, no data will be collected here. Of course you can always go back and look at the data taken earlier. Should you need to move the antenna later, this mode can be enabled again by the TTM NOC at the expense of interrupting measurements. The best way to look for short-term changes in reception conditions is to query the last 15 minutes worth of data by setting the start time to -900s and the display period to 15 min. Whenever you wish to observe a change, it is sufficient to use the reload function of your browser; this will update the display with the latest data. When looking for signal strength improvements by changing antenna orientation and location, the Cumulative S/N Ratios display is very useful. Comparing different antenna locations with roughly equivalent short-term measurements is best done by taking at least 24 hours worth of data at each location and comparing the Reception Conditions graphs for those periods. The various graphs on the GPS Tuning pages have the same format as the GPS Status graphs and are explained on the GPS Status Help page. |
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