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To help you having a short cord for launching but a long cord during flight, the dereeler DSA99 has 40m of cord on its reel and unreeled length of 30cm.
After launching, the balloon cord becomes unwinded by the weight of the Radio weather sonde DS99 during first minutes of the ascent.
The dereeler is to be connected between Radio weather sonde DS99 and parachute. For easy fitting with the balloon cord the dereeler uses cord loops.
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Operating Manual