[amsat-bb] Antenna Burn Resistor data

Ross Whenmouth ross at topwire.co.nz
Sat Sep 6 14:16:08 UTC 2014

Bob, does your mass budget allow you to include a fuse in series with 
the burn resistor?

eg Looking at:

Your 15R burn resistor will draw ~ 0.5A from your 7.5V supply?
Looking at the fuse curves for the "FLAT-PAK Slo-Blo Fuse 203 Series" on 
page 23 of that PDF, the 1/4A variant of those fuses should open after 
about 6 seconds @ 0.5A (might blow a bit quicker in a vacuum though 
since there is no atmosphere to convect heat away from the fuse?)

There will be other suitable fuses - the above is just an example (I do 
not work for Littelfuse).

Ross Whenmouth

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