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Lessons
Learned ANSR-4, December 1, 2001 Micro Beacon operation nominal in “experimental” enclosure. Numerous system failures including; (A) Payload Computer GPS inoperative, (B) low sensitivity cross band repeater, (C) unable to command payload computer, (D) “last minute” failure of Micro Beacon power converter, (D) low/missing ATV RF output power, and (E) an ATV camera mount failure.  GPS rendered inoperative just before launch. Most likely cause was tantalum residue from failed capacitor on low voltage control lines.
Solution - Clean and test circuit board.Limited cross band repeater sensitivity.
Solution - Replace diplexer with higher isolation unit and replace radio with better unit.User interface problems with TNC in field didn’t allow mobile commanding of cut down system.
Solution – Better user training and preflight preparation.During last minute construction of Micro Beacon package, reverse battery power was applied destroying power converter.
Solution – Replaced power connector on board with polarized version.
A protection diode could be used, but the forward voltage drop is a large
percentage of the battery voltage.Flight Data
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