USER'S GUIDE____________________________________________________________________
28 __________________________________________________________________ M010117EN-H
If the receiver has not found the radiosonde signal, the system gives an
alarm sound. To scan the radio band and lock the receiver, click the Find
button on the Signal frame.
The tuner starts to scan the allocated frequency band for the radiosonde
signal. When the signal has been found, the receiver is locked at this
frequency. A yellow line will appear into the Strength field to confirm
that the receiver is locked. The scan operation will stop automatically.
0203-084
Figure 16 Signal Frame
You can control the receivers’ working mode (AFC ON/OFF TRACK)
from the Controls frame. The panel also makes it possible to switch on
the automatic sweep display, but in this mode the PTU reading will be
stopped during the sweeping.
0203-085
Figure 17 Radio Controls Panel
After tuning the receiver you can proceed to releasing the balloon, see
Step 11: Releasing the Balloonon page 32.
NOTE
It is recommended to use the Track mode in the beginning of the
sounding with RT20A. The AFC mode should be selected about 10
minutes after the release, especially if the signal is weak.
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