albertson.ch...@gmail.com said:
What stops working when things get cold?
On Mars, the solar cells are pointed in the right direction. Why doesn't
it
recover when the sun comes back in the Spring?
They run out of power for running the battery heaters, then the battery
freezes and fails.
] Space mission comes to an end
becuase of a computer time tagging problem
On Sat, Sep 21, 2013 at 6:40 PM, Hal Murray
hmur...@megapathdsl.net wrote:
What stops working when things get cold?
On Mars, the solar cells are pointed in the right
direction. Why doesn't it
recover when
On 9/21/13 11:03 PM, Hal Murray wrote:
albertson.ch...@gmail.com said:
What stops working when things get cold?
On Mars, the solar cells are pointed in the right direction. Why doesn't
it
recover when the sun comes back in the Spring?
They run out of power for running the battery
Well, since this thread has recurred and there seem to be people with
good knowledge here, I've got to ask how a spacecraft that has lost
its ability to aim antennas at Earth or align solar panels with the
sun could possibly be diagnosed with having a time tagging problem?
Jim Lux pretty well
On 9/22/13 10:07 AM, Bill Hawkins wrote:
Well, since this thread has recurred and there seem to be people with
good knowledge here, I've got to ask how a spacecraft that has lost
its ability to aim antennas at Earth or align solar panels with the
sun could possibly be diagnosed with having a
And my favorites: Nickel-Hyrdogen cells and their silvery cousins. You have
to work REALLY hard to kill them.
---
for rechargeable?
NiCd (in the past)
Lithium Ion (now)
___
time-nuts mailing list --
On Sat, Sep 21, 2013 at 11:03 PM, Hal Murray hmur...@megapathdsl.net wrote:
We are talking about running computers and radio gear rather than motors.
I can see running motors in bursts from batteries, but computers and radios
generally run continuously so they shouldn't need a battery when
On 9/22/13 4:48 PM, Mark Sims wrote:
And my favorites: Nickel-Hyrdogen cells and their silvery cousins. You have
to work REALLY hard to kill them.
Yes, forgot the NiMH too.. although they self discharge
---
for rechargeable?
NiCd (in the past)
Lithium Ion (now)
No, I'm talking about nickel/gaseous hydrogen cells. Basically they can't be
overcharged/overdischarged/frozen to death. State of charge can be determined
by a pressure reading. Can be cycled a zillion times.
--
And my favorites: Nickel-Hyrdogen cells and their
On 9/20/13 5:12 PM, Bob Camp wrote:
Hi
Low bid wrist watch used as time base?
-
I'd bet there is some form of master time tick in their RTOS that
keeps everything pumping. Loose the time tick (or the time tick
count) and it all goes away…
yes and no.
Most
from JPL
http://www.jpl.nasa.gov/news/news.php?release=2013-275
Mission controllers postulate that there was an anomaly generated by
the spacecraft's software which left the vehicle's computers in a
condition where they are continuously rebooting themselves. If this is
the case, the computers
Hi
So it's a pretty good AT cut crystal without any compensation of heating. Not
quite a cheap wrist watch, but not a BVA in a dewar flask either.
Bob
On Sep 21, 2013, at 8:11 AM, Jim Lux jim...@earthlink.net wrote:
from JPL
http://www.jpl.nasa.gov/news/news.php?release=2013-275
Mission
On 09/21/2013 02:52 PM, Bob Camp wrote:
Hi
So it's a pretty good AT cut crystal without any compensation of heating. Not
quite a cheap wrist watch, but not a BVA in a dewar flask either.
The environmental perturbations should go quite slow most of the time,
as it glides in the void slowly
On 9/21/13 5:52 AM, Bob Camp wrote:
Hi
So it's a pretty good AT cut crystal without any compensation of heating. Not
quite a cheap wrist watch, but not a BVA in a dewar flask either.
Yep. The AuxOsc is what is used if you don't want to have the downlink
locked to the uplink.
On 9/21/13 6:03 AM, Magnus Danielson wrote:
On 09/21/2013 02:52 PM, Bob Camp wrote:
Hi
So it's a pretty good AT cut crystal without any compensation of heating. Not
quite a cheap wrist watch, but not a BVA in a dewar flask either.
The environmental perturbations should go quite slow most of
On 09/21/2013 03:26 PM, Jim Lux wrote:
On 9/21/13 6:03 AM, Magnus Danielson wrote:
On 09/21/2013 02:52 PM, Bob Camp wrote:
Hi
So it's a pretty good AT cut crystal without any compensation of
heating. Not quite a cheap wrist watch, but not a BVA in a dewar
flask either.
The environmental
from JPL
http://www.jpl.nasa.gov/news/news.php?release=2013-275
Mission controllers postulate that there was an anomaly generated by
the spacecraft's software which left the vehicle's computers in a
condition where they are continuously rebooting themselves. If this is
the case, the computers
jim...@earthlink.net said:
If it gets cold enough (without power from solar cells, it won't generate
enough internal heat to keep warm), it will die. That's probably what
happened to Spirit on Mars. It got cold enough during the Martian winter,
and with not enough solar power, enough
On 9/21/13 6:40 PM, Hal Murray wrote:
jim...@earthlink.net said:
If it gets cold enough (without power from solar cells, it won't generate
enough internal heat to keep warm), it will die. That's probably what
happened to Spirit on Mars. It got cold enough during the Martian winter,
and
On Sat, Sep 21, 2013 at 6:40 PM, Hal Murray hmur...@megapathdsl.net wrote:
What stops working when things get cold?
On Mars, the solar cells are pointed in the right direction. Why doesn't it
recover when the sun comes back in the Spring?
They run out of power for running the battery
NASA's Deep Space Comet Hunter Mission Comes to an end
The news release includes this paragraph:
After losing contact with the spacecraft last month, mission
controllers spent several weeks trying to uplink commands to reactivate its
onboard systems. Although the exact cause of the loss is
Winders?
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of David J Taylor
Sent: Saturday, 21 September 2013 2:51 AM
To: Time-nuts mailing list
Subject: [time-nuts] Space mission comes to an end becuase of a computer time
tagging problem
-nuts-boun...@febo.com] On
Behalf Of David J Taylor
Sent: Saturday, 21 September 2013 2:51 AM
To: Time-nuts mailing list
Subject: [time-nuts] Space mission comes to an end becuase of a computer
time tagging problem
NASA's Deep Space Comet Hunter Mission Comes to an end
The news release
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