SPACE WARP TECHNOLOGY

A Very Loud, Light and Inexpensive Sonic Beacon

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CAUTION USE EAR PROTECTORS WHEN TESTING HORN. THE HORN   CAN DAMAGE EARS .
 

The photos below show one approach. The unit with two Lithium batteries wired in series with in at 6.4 oz. 

When all is said and done, a sonic beacon that is loud and runs up to 6 hours is a very handy piece of electronics to put onboard a rocket.  A very reliable sonic beacon can be build for under $35 using the following:

•     One Moose MPI-47C Piezo Screamer - $13
          can be purchase at http://www.prosecuritys.com/mpi-47c.html.
   

•     Two Lithium Ultralife 9 volt batteries - $10
          can be purchased at http://www.batterymart.com/battery.mv?p=BAT-U9VL-X.
   

•     Duck tape and nylon strap -  $3
   

•     Magnetic Switch with battery - $1:15
           can be purchased at http://www.elexp.com/cmp_00rd.htm.
   

•     Ceramic Magnet - $1.29   
           can be purchased at http://www.radioshack.com/sm-high-energy-ceramic-magnet--pi-2102689.html.
   

Attach the magnetic switch anywhere on the body of the Screamer you deem appropriate. The magnet need to be placed such that when the chute deploys the magnet will be pulled off the screamer. The screamer can be left in the cone or airframe or be attached to the shock line to the parachute.