[amsat-bb] Antenna Burn Resistor data
gzook at yahoo.com
Sat Sep 6 17:21:16 UTC 2014
The whole idea behind a burn resistor is for a mechanical failure which then releases the antenna. Putting a fuse in line would not result in any mechanical failure because the body of the fuse would still be in place. A fuse link, that is a piece of wire without any housing, might work. However, finding something, that could withstand the forces in launching that would still "fail" when the voltage was applied, might be problematic.
AMSAT 239 / LM 463
On Saturday, September 6, 2014 9:15 AM, Ross Whenmouth <ross at topwire.co.nz> wrote:
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).
Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions expressed
are solely those of the author, and do not reflect the official views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
More information about the AMSAT-BB