There's also sodium-potassium alloy (NaK), which has rather interesting
properties--liquid at room temperature, spontaneous superoxide formation with
air--and was used as a coolant in some nuclear reactors.
--
Irene
On Thu, Mar 03, 2011 at 07:52:55AM +, Robert Atkinson wrote:
Hmm,
Anyone
On 03/03/2011 02:52 AM, Robert Atkinson wrote:
Hmm, Anyone else remember Sodium-Sulphur secondary batteries? they
were proposed for electric vehicles in the late 70's I rode on a
prototype at Chloride. You have to heat them up to melt both the
Sodium and the Sulphur to make them work (about
Months ago a bought an old Delorme Tripmate for $5 (for that price,
why not?). Tonight I finally got around to fooling with it. After
finding out that it was designed to talk only to Delorme software
without some finagling, I got it to spit out NMEA data to Teraterm and
other programs.
I
Hello Joe,
The gps probably has not finished receiving the entire almanac, and is
guessing the number of leapseconds. The offset may go away after the almanac
has been received.
This can take up to 12.5 minutes.
It is a design flaw in the gps spec in my opinion, they could have transmitted
On Thu, Mar 3, 2011 at 3:54 AM, Chris Caudle ch...@chriscaudle.org wrote:
Has anyone found reference which derives the worst case clock jumps to
expect when using PTP (IEEE1588-2008) and how to derive a phase noise
spectrum from that?
As Magnus says, this is highly dependent on
Said,
I suspected it might have something to do with the almanac. The
Tripmate has been on now for 100 minutes, but has not been able to
track four satellites during that entire time. Does the GPS need to
track at least four satellites continuously during the 12.5 minutes
it takes to download
I suspected it might have something to do with the almanac. The Tripmate has
been on now for 100 minutes, but has not been able to track four satellites
during that entire time. Does the GPS need to track at least four satellites
continuously during the 12.5 minutes it takes to download the
At 11:40 PM 3/2/2011, jimlux wrote...
On 3/2/11 8:21 PM, Mike S wrote:
At 08:43 AM 3/2/2011, jimlux wrote...
You know, elements we love, Rb, Cs...
http://www.youtube.com/watch?v=eCk0lYB_8c0
Totally safe for work.. (my daughters turned me on to this video,
they
saw it in their 8th grade
Thanks again to the generosity of Rob Kimberley who provided the original,
I have upoladed a scan of the manual for the Efratom VRFS rubidium
frequency standard to Rapidshare.
The VRFS is a VXIbus module that contains an Efratom FRS rubidium standard
plus the associated electronics to
Nigel,
Thanks for the manual post. I'll get it on the to-way.com site later today.
Hadleu
K7MLR
At 06:55 AM 3/3/2011, you wrote:
Thanks again to the generosity of Rob Kimberley who provided the original,
I have upoladed a scan of the manual for the Efratom VRFS rubidium
frequency standard
In a message dated 03/03/2011 15:57:37 GMT Standard Time, h...@to-way.com
writes:
Thanks for the manual post. I'll get it on the to-way.com site later
today.
-
That's great, thank you.
regards
Nigel
GM8PZR
___
time-nuts
Hi
In a real network you may have multiple switches and a lot of variable
traffic. Your noise is coming from many sources. You make some high level
choices in terms of sample rate. Without pretty exact information, you are
going to have a hard time coming up with a useful answer.
Data with box
Hi Joe,
One way to prevent this issue is to make sure you have a good battery in the
unit to keep an almanac copy in SRAM..
Try putting the unit outside with a clear sky view.
Btw: the error usually depends on when the gps firmware was compiled, as the
manufacturer hard-codes the number of
Hi Hal,
The almanac is helpful, but not required to track sats. Only the ephemeris info
is needed, which is repeated every 30+ seconds or so if I remember correctly,
which is why modern receivers can be locked in as little as 36 seconds or less
from cold start without almanac or assistance
Hi
This stuff is obviously on the fast track to somewhere. There is no
practical way to come up with the information needed in the time allowed.
There's a train wreck out there in somebody's future.
Has anybody seen an actual map of where they plan to deploy all 40,000 these
1.5KW transmitters?
Tunnels wouldn't be such a great thing, as many of them have GPS transponders
built in so that you can continue tracking as you pass through the tunnel.
The administration has made it a major priority to bring broadband internet
to everyone's Crackberry It looks like they are going to do it
Hi
There's obviously major fuel behind this thing. I'm willing to pass up GPS
underground. It's GPS out in the open that is my main concern. IF they are
going to use this for last mile connect to homes it will indeed be
everywhere and anywhere. IF that's the case, you loose all sorts of GPS
Maybe we should alarm the environmentalists about the 60 MW load being added
to the power grid.
Tom Holmes, N8ZM
Tipp City, OH
EM79
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bob Camp
Sent: Thursday, March 03, 2011 12:10 PM
Who is Lightsquared ?
http://www.lightsquared.com/about-us/management-team/
Executive Vice President, Regulatory Affairs and Public Policy
Jeffrey J. Carlisle
From 2001 to 2005, Jeff served as Deputy Chief and then Chief of the
FCC's Wireline Competition Bureau. At the FCC, he managed
And
Forget ..
in the nlpc article
How Phil Falcone ensured a suitably flexible FCC
pretty much sums it up
1. visit white house
2. make maximum contributes (you, your wife and your boss) a couple days later
3. get the go ahead from the FCC
An just to ensure it is totally bipartisan, make sure you
Many older GPS units sending NMEA at 4800 baud will in effect indicate
one second slow, either all the time or some of the time, if there are
too many GPS sentences turned on. There's too much data in the queue.
Either drop the number of sentences enabled, or increase the baud rate,
or both.
What gets me (I'm an outsider in the UK), is that they seem to have used the
excuse of Urban Canyon lack of space based broadband to hi-jack the frequencies
for ground use. What's the betting 99% of the traffic is ground based, not
space? Even though the Urban Canyonites could of course use
Hi
Urban canyons do indeed exist and there are a lot of them. As you look for
smaller and smaller ones, you obviously find a lot more of them. Other
services have the same issue and they can economically justify a few
thousand transmitters to cover these holes. These guys are going for 10X
what
Hi Robert:
The military BA-5590/U primary battery uses a Lithium Sulfur Dioxide
chemistry where the Sulfur Dioxide is under something like 4 atmospheres
of pressure.
The newer BB-2590/U is a Lithium Ion rechargeable battery. There are
many videos of what happens to them when punctured.
I've got three of them one was $1 at a g'sale.
-pete got to stop buying this crap .. never
On Thu, Mar 3, 2011 at 1:06 AM, Joseph Gray jg...@zianet.com wrote:
Months ago a bought an old Delorme Tripmate for $5 (for that price,
why not?). Tonight I finally got around to fooling with it. After
Joe...
Any tips on how you set it up to get those messages?
Tom Holmes, N8ZM
Tipp City, OH
EM79
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Joseph Gray
Sent: Thursday, March 03, 2011 4:07 AM
To: time-nuts@febo.com
Subject:
Tom,
Using a real PC serial port which sets DTR, you just need to send the
string ASTRAL to the Tripmate. Then it will start sending NMEA data to
the PC.
For a mod which takes care of DTR and feeds ASTRAL back to selfstart
the Tripmate, look here:
I turned off all sentences except RMC. It is still showing about 2s
behind UTC. This model was made in the mid 90's. How many leap seconds
have we had since?
Joe Gray
W5JG
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
This might help:
http://leapsecond.com/java/gpsclock.htm
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Joseph Gray
Sent: Thursday, March 03, 2011 12:29 PM
To: Discussion of precise time and frequency measurement
Subject: Re:
On 3/3/11 9:34 AM, Bob Camp wrote:
Hi
There's obviously major fuel behind this thing. I'm willing to pass up GPS
underground. It's GPS out in the open that is my main concern. IF they are
going to use this for last mile connect to homes it will indeed be
everywhere and anywhere. IF that's the
The other scenerio is buy stock in the leading GPS makers and assume that
they and Lightsquared will lobby effectively and everyone will be forced to
buy new GPS units...
There is precedent in that, the DTV converter box vouchers...
Jim Cotton
n8qoh
On 3/3/11 3:09 PM, jimlux wrote:
On 3/3/11
As it has been said, if the Federal government can force you to buy
health insurance, or pay a fine, it can force you to buy *anything*.
This is, however, getting a little too far afield for this group.
-Chuck Harris
Jim Cotton wrote:
The other scenerio is buy stock in the leading GPS makers
jg...@zianet.com said:
I turned off all sentences except RMC. It is still showing about 2s behind
UTC. This model was made in the mid 90's. How many leap seconds have we had
since?
Dec 2008
Dec 2005
Dec 1998
Jun 1997
Dec 1995
Jun 1994
Jun 1994
Jun 1992
Dec 1990
From the table on the right
Sorry for the OT, but I know a lot of time-nuts subscribers use my site, so
I wanted to make sure you know what happened.
My site was infected by malware on March 1st. Google reported my site as
infected and sent me an email around 11:00 AM CST.
Several people notified me in the afternoon and
James,
The data stream is not that difficult to decode. You can look at the source
code for my GPSMonitor project:
http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:gps_monitor
Didier KO4BB
On Tue, Mar 1, 2011 at 7:37 PM, James Fournier ja...@jfits.ca wrote:
Hello All, Has any one
http://www.radionavigation.alancordwell.co.uk/
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Hi
Based on some *very* rough Google stuff, it looks like you can cover a good
chunk of the US with cell towers and only use 100,000 to 200,000 towers.
Since they are a 30 watt-ish sort of thing, their RF footprint is likely a
lot smaller than a 1.5 KW setup. Even if the power increase only
The problem will probably resolve itself when the first idiot to lose
his GPS at a T junction drives into the deli across the street as he/she
was not told to take a turn. The driver will sue for denial of service
and 50 million other Americans will jump on board the class action.
Le
Robert wrote:
What gets me (I'm an outsider in the UK), is that they seem to have
used the excuse of Urban Canyon lack of space based broadband to
hi-jack the frequencies for ground use. What's the betting 99% of
the traffic is ground based, not space? Even though the Urban
Canyonites could
ftp passwords go out over the internet unencrypted. To get around this, use a
secure ftp. On windows, use winscp. For linux, gftp.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
Thanks, Joe!
Tom Holmes, N8ZM
Tipp City, OH
EM79
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Joseph Gray
Sent: Thursday, March 03, 2011 2:02 PM
To: Discussion of precise time and frequency measurement
Subject: Re:
Hey, at least you got vouchers. Here in Cambridge UK the analogue signal goes
off next weekend and you are on your own for converters.
Robert G8RPI.
--- On Thu, 3/3/11, Jim Cotton jim.cot...@wmich.edu wrote:
From: Jim Cotton jim.cot...@wmich.edu
Subject: Re: [time-nuts] latest on the
42 matches
Mail list logo
