Figure 1.12—Surface Observation Display window.
In the TRS Antenna Display, move the antenna to the pre-determined baseline position and click in the box to activate AFC.
If a different radio frequency other than the standard frequency of 1680 MHz is used, change the frequency on the TRS now. In the TRS Display, click the “Set” button and enter the new frequency.
By now, 5 minutes should have passed and the battery will have warmed up. Click “Next” on the Surface Observations window. The SPS will now initialize. The radiosonde baseline process now begins. Immediately check the sensor data. The pressure should be within 2mb of the digital barometer at the station. Check the temperature data. If any data seems questionable and the sensor seems faulty, reject the sonde. See Chapter 6, Part A for radiosonde rejection procedures. Check for the proper frequency in the Antenna Orientation/TRS Display window.
Check the GPS status screen. There must be a MINIMUM OF 4 MATCHES to proceed. To complete the baseline process, click on “CALCULATE” and “ACCEPT” in the Baseline Display window. The RWS software will pop up an error message if any sensor data is out of tolerance. If there is a problem with the incoming data, sonde rejection may be necessary. If all is well, the software will ask for confirmation that the baseline process is finished. Click “YES.”