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Re: Antennas on the bird



Gary,
I hope this answers your question.

AO-40 continued to transmit telemetry for 43 hours 14 minutes and 39 seconds
after the second burn attempt.

The second burn sequence ended at Dec 11, 2000 16:08:52 UTC and the telemetry
stopped at Dec 13, 2000 11:22:31 UTC.

73's de Rich @ WC8J

----

Gary \"Joe\" Mayfield wrote:

> <Stuff Snipped>
> > Richard W L Limebear wrote:
> > > Here's one I haven't seen anything about: Omnidirectional antenna
> failures.
> > > 70cm probably never worked, nor did 23cm. 2m only worked for a while.
> > >
> > > My own (fairly ignorant) suspicions fall on mechanical resonance effects
> > > during the powered parts of the launch when, I believe, they were
> dangling
> > > below the spacecraft. So, just like a piece of wire repeatedly flexed,
> maybe
> > > they fractured in-flight; some came off completely and some were so
> weakened
> > > that later effects shook them off (did the 2m PA have swr protection ?).
>
> <More Snipped>
>
> > finally said "I'm outa here"  :)
> > And then maybe the forces of the burn of the 400N motor finally did in the
> > 2meter ant....
>
> I was under the impression 2 meter telemetry stopped AFTER the burn was
> complete.  Is this correct?  Wasn't data received on 2 meters for a short
> while after the burn?  Peter mentioned 2 events.  I assumed they were the
> burn being longer than expected, and the system/commuincations crash that
> ocurred later.  Can anyone tell us how long the time between these events
> was?
>
> Thanks and 73,
> Joe
> ka0yos@amsat.org
>
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