Chapter 3 ________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 15
NOTE
Check the leveling of the antenna.
If the RT20A has been installed on soft or uneven ground, the ground
may yield under the antenna legs and the leveling must be corrected.
Step 2: Aligning the RT20A
After the RT20A has been installed, align it according to the following
procedure:
1. Drive the antenna to zero position with the hand terminal (El=90
Az=0 deg).
2. The antenna is now pointing to a certain direction. Determine the
true bearing of that direction, taking the local magnetic declination
into account.
3. Write down the true bearing, that is, the antenna’s front direction
angle. It must be entered later into DigiCORA as described in Step
8: Entering Station Data and Front Direction Angle on page 24.
Step 3: Starting a New Sounding
1. Start a new sounding by clicking the New Sounding button or
by clicking the button in the DigiCORA toolbar.
2. If you have more than one rack connected (for example, SPS311 in
addition to RT20A), DigiCORA prompts you to select the rack to
be used for the sounding. Select the rack from the list and click
OK.
3. The Act field in the HW Status frame on the right starts blinking
and System Status on the bottom of the screen shows the sounding
equipment start in progress.
Step 4: Preparing the Balloon
Prepare the balloon before reading the coefficients and activating the
radiosonde. See the Radiosonde User's Guide for instructions on
preparing the balloon.
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