In message
, Chris Albertson writes:
>The plan was to place maybe 100,000 devices in orbit [...]
That would effectively end human spaceflight, because you would generate
a massive layer of space-debris.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP s
If there is a way to steer this thread to an actual time & frequency topic,
then continue to post.
Otherwise, please consider the thread now closed. Or carry it on in *private*
emails with the OP.
Thanks,
/tvb
http://leapsecond.com/time-nuts.htm
_
Has anyone considered a laser pumped variant like:
http://tf.nist.gov/general/pdf/1009.pdf
Apart from the ECDL laser (can be assembled using readily availalble
parts) it looks fairly straightforward.
Bruce
Tom Van Baak wrote:
Very nice bit of R&D work on Corby's part. Mine is certainly work
Jim Lux wrote:
>It's been challenging to find out information like Center of Mass position,
>where the other GPS receivers are, etc. (complicated in part because half
>of station is measured in inches/feet, and the other half in meters)
This reminds me of a story I heard about while building th
Gregory
Well I am afraid I have become spoiled in that I use the GPS locked
references these days. They consume little power or maybe about the same
actually as the 10. So I also have a mix of great old oscillators. But for
me at least thats what the 10 would be. I have to say that it was what
star
On 4/27/13 9:40 AM, Gregory Muir wrote:
On Fri, 26 Apr 2013 17:59:21 -0700, Jim Lux wrote:
Total dose will be very small (after all astronauts live in LEO)
So you'd worry about cosmic rays and single event effects.
They fly a lot of unmodified commercial equipment on ISS (and on
Shuttl
Sometimes imaging sensors are just not available at wavelengths of
interest. There is no choice but mechanical scanners.
Bearings are also needed to de-spin antennas, etc.
-John
=
> On Sat, 27 Apr 2013 12:06:45 -0700 (PDT), L. Forster wrote:
>
>>When I was building space payloads, ever
On Sat, 27 Apr 2013 16:16:17 -0400, Paul Swed wrote:
>I looked and must have hit the same site you did for the sulzer. Yes I
>expect a log warmup. I used them in the navy and we never let them go
>cold. circa 1973-1979. Took them to the cal lab on battery etc. I thought
>maybe I would have a m
On Sat, 27 Apr 2013 12:06:45 -0700 (PDT), L. Forster wrote:
>When I was building space payloads, every component had to meet or exceed
>a VCM (Volitile Condensible Material) spec.
>This was mainly of concern with plastics, like wire insulation (we used
>Teflon and Kapton) but especially potting c
An iPhone as a weapon of mass (times velocity squared) destruction.
On 4/27/2013 7:03 PM, J. Forster wrote:
Putting 100,000 items in space is a non-starter. The existing space trash
is already a big concern, and there have been seriuous proposals for
missions to clean it up. An iPhone, travelli
I just built a 3 term adjustable reg and that was it. Been running fine for
many many years.
Pretty sure this topic has been on time-nuts before and as I recall the 3
terminal regulator was a completely evil solution. That discussion was a
while ago also.
In the meantime as look to the right and in
Gentlemen,
One of the objects of the phone sat missions is to ensure deorbit for
exactly that reason. (As a matter of fact, it just happened today.) More
than a few of the new cubesats have deployable streamers to accelerate
reentry.
Why not a cloud of 100? Start small. Makes sense and sounds good
Putting 100,000 items in space is a non-starter. The existing space trash
is already a big concern, and there have been seriuous proposals for
missions to clean it up. An iPhone, travelling at orbital velocity, has a
lot of kinetic energy!
There was an uproar years ago when the Westford Needles ex
Hi Chris,
On 04/27/2013 11:07 PM, Chris Albertson wrote:
On Sat, Apr 27, 2013 at 9:40 AM, Gregory Muir wrote:
I'm curious if they ever have any problem with earth-based commercial component
outgassing clouding the camera optics.
I went to a lecture on the idea of putting a cell phone like o
Fellow time-nuts,
I have a Sulzer 5A, but no NiCd batteries. Buying new batteries is
possible, but would cost me more than the unit cost me. One alternative
proposed would be to build a Zener-based battery-simulator, to have the
PSU operate properly without batteries. Another would be to fit o
On Sat, Apr 27, 2013 at 9:40 AM, Gregory Muir wrote:
> I'm curious if they ever have any problem with earth-based commercial
> component
> outgassing clouding the camera optics.
I went to a lecture on the idea of putting a cell phone like object in
orbit. The idea was that it should have a cos
I looked and must have hit the same site you did for the sulzer. Yes I
expect a log warmup. I used them in the navy and we never let them go
cold. circa 1973-1979. Took them to the cal lab on battery etc. I thought
maybe I would have a manual I don't.
You are lucky to get one. Great reference.
When I was building space payloads, every component had to meet or exceed
a VCM (Volitile Condensible Material) spec.
This was mainly of concern with plastics, like wire insulation (we used
Teflon and Kapton) but especially potting compounds.
And, don't even think about ball bearings near optics
On Fri, 26 Apr 2013 17:59:21 -0700, Jim Lux wrote:
>Total dose will be very small (after all astronauts live in LEO)
>So you'd worry about cosmic rays and single event effects.
>They fly a lot of unmodified commercial equipment on ISS (and on
>Shuttle, when we still flew it) and they typical
Thank you for you replies Dave and Paul!
Well, patience won out and I left the unit on for a considerably longer time.
The inner oven meter indication then started to come up off of zero after
nearly seven hours. Not knowing the thermal mass it has to heat I guess I
assumed that it would have
Hi All, I am trying to get my head around building a nanobsd for some HP
thinclients to run as stratum 1 servers.
If you have the time, please send me an example conf file for "sh nanobsd.sh -c
myconf.nano"
I am unsure of how to add my 2 refclocks, a 29 (trimble) and a 20 (nmea+pps)
Also, where
> Very nice bit of R&D work on Corby's part. Mine is certainly working well
> after the modification, but I'm just blown away at the performance seen with
> Tom's unit.
Hi John,
Yes, apparently some 5065A respond better than others to Corby's clever mod.
It's clear why there is improvement; it'
Hi,
Where are the details of the changes and how to do them?
Jim
On Saturday, 27 April 2013, John Miles wrote:
> Very nice bit of R&D work on Corby's part. Mine is certainly working well
> after the modification, but I'm just blown away at the performance seen
> with
> Tom's unit.
>
> Another
I can say inners always take a lot longer
The battery pack being out may be effecting some critical voltage
Just a guess
Paul
WB8TSL
On Fri, Apr 26, 2013 at 5:07 PM, wrote:
> To all,
>
> I acquired a AN/URQ-10A frequency standard which appears to have received
> little or no service since its b
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