Vaisala Radiosonde RS41-D - Preparing Optional Sounding Accessories; Figure 4 Radiosonde RS41 Optional Accessories

3.3 Preparing Optional Sounding
Accessories
The unwinder is designed to be attached directly to the folded balloon neck, but in case you
cannot attach the unwinder to the balloon, the unwinder can also be used with optional
sounding accessories which provide the necessary support during the sounding. The
sounding accessories are needed to restrict the movement of the unwinder. In this section,
optional sounding accessories refer to a hanger board or a parachute.
The unwinder must always be attached to a relatively
firm support. The support must not let
the unwinder twist freely, or otherwise the suspension string might unwind at too high a
speed and the radiosonde hit the ground during the launch. However, the unwinder must be
able to swing slightly during the sounding.
Similar to the balloon, the unwinder and the optional sounding accessories must be
prepared before launching the radiosonde. See Figure 4 (page 20) for the
dierent
options.
Figure 4 Radiosonde RS41 Optional Accessories
RS41-D User Guide M211952EN-C
20