Vaisala RS92-KL - Manual (Page 20)

User's Guide ______________________________________________________________________
18 __________________________________________________________________ M210299EN-D
6. Fold the neck of the balloon over and secure firmly. Tie the string
high enough to ensure that the unwinder fits easily.
0705-022 Figure 8 Folding the Neck of the Balloon
7. Leave the balloon waiting in the balloon filling shed while you
prepare the radiosonde. Make sure the balloon does not touch
anything. Hold the balloon by the neck.
Optional Sounding Accessories
The Radiosonde RS92 unwinder RSU911 is designed to be attached
directly to the folded balloon neck. However, you can use the same
unwinder if you use optional sounding accessories such as a parachute
or a radar reflector.
Always attach the unwinder to a relatively firm support such as the
balloon or the parachute spreader. The support must not let the
unwinder twist freely, or otherwise the balloon string might unwind at
a too high speed and the radiosonde hit the ground during the launch.
The unwinder must also be able to swing slightly during the sounding.
Attach all optional sounding accessories next to the balloon, or
otherwise they disturb the measuring environment of the radiosonde
and no proper temperature and humidity measurements can be made.