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--- ideas:flight_support [2011/10/25 10:36] – macywales
+++ ideas:flight_support [2013/05/07 07:55] (current) – [Radar Reflector] rocketboy
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 {{:ideas:corner.jpg|:ideas:corner.jpg}}
+FAR101 says "the reflector will present an echo to surface radar operating in the 200 MHz to 2700 MHz frequency range".
 Size - commercial radiosonde radar refelctors are about 50cm tip to tip.
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 ===== Pyrotechnic Cutdown Device =====
-This device is used to detach the payload from the balloon (or release items attached to the payload). Its an igniter (used in amateur rocketry) inside a small hard plastic tube (sealed with epoxy at both ends) - when fired the igniter has enough explosive force to shatter the tube (and hence release the balloon) - it works a treat in all the tests I have done, including some at -30dec C and in a vacuum [[http://www.ghengisfireworks.co.uk/|fireworks]] chamber.
+This device is used to detach the payload from the balloon (or release items attached to the payload). Its an igniter (used in amateur rocketry) inside a small hard plastic tube (sealed with epoxy at both ends) - when fired the igniter has enough explosive force to shatter the tube (and hence release the balloon) - it works a treat in all the tests I have done, including some at -30dec C and in a vacuum chamber.
 __**WARNING: wear full eye area wrap around safety goggles when testing these devices.**__
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-The ignitor on the right hand side of the circuit can be replaced by a small 6V bulb for testing - the bulb will light breifly when fired. Once you are happy with the circuit try an igniter.
+The ignitor on the right hand side of the circuit can be replaced by a small 6V bulb for testing - the bulb will light briefly when fired. Once you are happy with the circuit try an igniter.
+[''adeptium/STARS Project'': Not happy about the use of a wet cap for near-space use, but Farnell supplies an AVX 3300uF tantalum, 4-10V operating range, rated to -55C with no loss of capacity.  I'm going to try with one or two of these.]