ISEE-3 Status Report 20 June 2014 (afternoon)

We had to scrub ISEE-3 spin-up burn for today. We can't confirm receipt of commands in real time by the spacecraft. If we cannot confirm that proper commands were sent to propulsion system we cannot fire thrusters with full confidence. Remember: this spacecraft does not have a computer. All 21 dummy commands worked - that should NOT have happened.  Next time we sent them only 3 were accepted. Investigating ...

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