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elevation angles for the latest points in the Processed Tabular Display.

If the SPS is not tracking properly, go to manual mode and enter the azimuth and elevation angles.  If this fails, it may be necessary to reset the SPS.  You can do this in the Hardware Status window.  Note that data will NOT be received when during the reset process.  Therefore, do NOT reset the SPS prior to reaching 400mb.  If necessary, terminate the flight, reset the SPS, and if time allows, perform a second release.

D. LOSS OF GPS PRIOR TO LAUNCH

Occasionally, the SPS will lose the GPS lock on the sonde prior to balloon release.  Give the system about 2-3 minutes with the sonde in the bucket to reacquire GPS.  Sometimes the SPS will have trouble locking on to the sonde if it is close to the building.

If all else fails, power cycle the battery.  Disconnect the battery wires in the same order that they were connected (black first).  Wait 30-45 seconds.  Reconnect the battery wires, but do it in reverse order.  Connect the red wire first, then the black wire.  Place the sonde back in the bucket and wait 3-5 minutes for the instrument to reset and the GPS to start again.

The SPS should now get a GPS lock.  Proceed with the launch.  If there is still no GPS lock, reject the sonde.

E. RRS HELPLINE

The RRS Helpline is (301)713-9800.  This line is manned during synoptic flight times from 1000-1400 UTC and 2200-0200 UTC.

F. MISSED OBSERVATIONS

Special coded messages must be sent out where is a missed observation, such as due to unfavorable weather conditions.  The codes will be 101xx, where xx represents a two-digit reason code.  To send out these messages, click on “Messages” -> “No Data…”  The No Data Message window will open.  Select the date of the flight on the calendar and the hour of the observation from the pull-down menu.  Next, select the appropriate reason code and click “Ok.”

The “WMO Coded and Radat Message Display” will appear.  Double-click in the boxes next to MAN, SIG, and ABV.  Click the “Transmit” button.

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