This is our cutdown mechanism. Originally it was
operated off of a basic stamp used for timing. It initiated to
separate to two cut down coils. First a top coil then a bottom
coil. Our mechanism is made similar to the EOSS cut down
mechanism. We use a DTMF activation after testing the system with
a timer. We felt that we wanted to get a reliable cut down
working before we incorporated the problem of radio reception. If
we lose reception our balloon will still come back down close instead
of going higher than we'd like.
Note: We no longer use this. We designed a
system that combined the secondary communication module and the cutdown
system so that we could cutdown on weight and use one less radio.