On Jan 13, 2011, at 5:18 PM, Rick Karlquist wrote:
The other problem for the garage builder is that one of the Rb
isotopes is slightly radioactive. Probably not OK to have
in your garage.
I used to perform Rb/Sr geochronology wet bench chemistry in
college. Rb-87 has a half-life on
Scott,
Just being a high vacuum nut may not be enough. Most vacuum
devices have getters engineered into them. These are usually
reactive coatings applied to the cavity wall that react with or
absorb trace gasses to maintain the vacuum. They are made of
evaporated thin-films of
On Dec 21, 2009, at 3:55 AM, Hal Murray wrote:
It doesn't take anything fancy. ntpd has a couple of drivers that
use the
standard audio stuff on a PC. 8K samples per second, alaw.
The IRIG driver works pretty well. I haven't tried the one for WWV.
I had WWV audio driver working in
Greetings,
We get a fair bit of lightning here in Texas. I'm a transplant from
nearly lightning free California, so I had to go thru an expensive
period of education. A couple quick thoughts:
Nothing will save you from a direct strike. At least nothing you can
likely afford. You're
In case anyone here is interested in the OpenSolaris project. Brian
sent this to me a few minutes ago, and I am forwarding with his
permission.
Rob
KC6OOM/5
Begin forwarded message:
From: Brian Utterback brian.utterb...@sun.com
Date: April 22, 2009 2:29:22 PM CDT
To: Robert Vassar
On Nov 20, 2008, at 4:27 PM, Hal Murray wrote:
ntpd has a refclock driver for WWV/H. I've never played with it.
http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver36.html
I played with it back in the 90's, I hooked up the audio line out
from my Yaesu FT-840 to a SPARCstation 20.
assistance! ;-)
73,
Dave
AF6KD
On Fri, Oct 3, 2008 at 2:39 PM, Robert Vassar [EMAIL PROTECTED]
vassar.com wrote:
I've been fiddling around with an old Cisco router here at the house
to brush up. We have an IPv6 project going at work, and our WAN
provider provides no native transit, so I'm
I've been fiddling around with an old Cisco router here at the house
to brush up. We have an IPv6 project going at work, and our WAN
provider provides no native transit, so I'm looking at doing some
tunneling. Anyhow... I discovered IOS 12.1 and above have native NTP
capability. I
On Sep 4, 2008, at 4:17 PM, Brooke Clarke wrote:
For
example you should be able to print the program so that each module
fits on a
one side of a single sheet of paper.
That is a highly language dependent metric. I can't see this
applying to assembly. I spend a lot of time coding
There have certainly been some amusing replies. My only point was
that if it you are storing stuff on spinning rust, you can't call
it a backup if it's still spinning. Power it off and de-cable it.
How much further you go after that to protect it depends on your risk
requirements. I
You can get rsync to run on Windows under Cygwin. This may help:
http://optics.ph.unimelb.edu.au/help/rsync/rsync_pc1.html
The heavy weight option might be to go to www.virtualbox.org,
download the free version, and run a virtualized Linux instance in a
container on your windows
Just a quick thought. I saw at least one person mention RAID, and
another mention multiple copies of the same data. A true backup copy
is off line. RAID does not protect you from an accidental delete,
virus, etc... Multiple copies only spreads the risk around.
I backup to a USB hard
On Aug 16, 2008, at 5:28 AM, [EMAIL PROTECTED] wrote:
Keeping it secular, what's with the PIC bashing?
Surely it's a case of horses for courses, and there's been enough
successful
commercial, as well as hobby, products based on PICs to suggest
you might be
just a wee bit out of
Of Robert Vassar
Sent: Thursday, August 14, 2008 6:25 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] I want a good micro-controller
Good grief! That's not a microcontroller! :-)
I like the MCS-51 family, but they're kind of goofy to
program in C
Good grief! That's not a microcontroller! :-)
I like the MCS-51 family, but they're kind of goofy to program in C,
and 8-bit. Upside, lots of vendors variants, including the really
nice SiLabs mixed signal chips made here in Austin. AVR is much
nicer to code in C, and has great
Tom,
Gnuplot is perfectly suitable for stuff like this. You just need to
describe what you want to graph, and set some bounds and ranges,
output type, etc...
Somewhere on my home server, is a backup of it's predecessor, I have
a Gnuplot script suitable for running out of cron as a daily
On Jun 23, 2008, at 5:29 AM, Magne Mæhre wrote:
Matthew Smith wrote:
Hi Folks
Does anyone know the current status of NTPD with NMEA PPS
drivers on
OpenSolaris?
Disclaimer: I work for Sun Microsystems, and may be biased...
Hi Magne!
Disclaimer here as well. I am speaking for
John,
It's not a security issue, but a load and RFC compliance issue. It's
a case of almost works but not quite.
When you have a MX record pointing at a CNAME record, you double the
load placed on the DNS servers used by other MTA's sending you
messages. Large ISP/Telco deployments
On Mar 17, 2008, at 1:27 AM, Magne Mæhre wrote:
Robert Vassar wrote:
Solaris has some pretty useful timing/timekeeping API's. You might
want to consider OpenSolaris, it's not quite BSD free, but the CDDL
is OSI approved. For some reason or another, Sun continues to use a
3.x derived NTP
Solaris has some pretty useful timing/timekeeping API's. You might
want to consider OpenSolaris, it's not quite BSD free, but the CDDL
is OSI approved. For some reason or another, Sun continues to use a
3.x derived NTP daemon. I know the maintainer. It's been a few
years since I
On Mar 1, 2008, at 4:56 PM, Matthew Smith wrote:
The small diameter captive cable used by some GPS antennas tends
to be
somewhat lossy and it may be better to extend the length by using a
lower loss cable.
Which is what I've got. I have a part-reel of satellite TV cable, so
will make
Lightning simply doesn't behave like you might expect. It's a DC
current, but the rise times and current magnitude gives rise to AC
behaviors. The problem with attractive protection is they have to
carry the full burden of the strike without fail. If it fails, the
current simply moves
On Feb 23, 2008, at 8:31 AM, John Ackermann N8UR wrote:
Sylvain RICHARD said the following on 02/23/2008 08:59 AM:
Please note that the usual caveat (is your server time set
correctly?)
does not apply our case.
Just to tie off my end, the originating machine for that message runs
In Apple Mail use View - Message - Long Headers.
FWIW Here's the relevant section on Sylvain's reply:
Received: from febo.com (meow.febo.com [24.123.66.139]) (using TLSv1
with cipher AES256-SHA (256/256 bits)) (No client certificate
requested) by mailhost.rob-vassar.com (Postfix)
Matthew,
I live in Texas, so I have something more than a passing familiarity
with oppressive heat. In essence, every watt imported into my den
has to be forcibly removed 9 months of the year, if not more. I
maintain a low stratum NTP server at home, sadly not stratum 1 (yet!)
on a
On Feb 20, 2008, at 5:05 AM, Bob Paddock wrote:
On Tuesday 19 February 2008 06:36:02 pm Robert Vassar wrote:
I regard PIC chips as something to be avoided. Horrible little
architecture that should have died back in the 70's. It gained a
foothold with hobbyists due to the ease with which
I'll second this. I'm kind of fond of the MCS-51 family for 8 bit
applications. They're really nothing special, old school stuff, but
they have something like 40% of the embedded market, and once you
learn their quirks, it just kind of sticks. Multi-source, and lots
of variants.
Probably picked up a few new list members as well...
O:-)
de KC6OOM/5
[EMAIL PROTECTED]
[EMAIL PROTECTED]
On Dec 11, 2007, at 11:42 AM, [EMAIL PROTECTED] wrote:
This was the story at Slashdot today.
http://hardware.slashdot.org/article.pl?sid=07/12/11/0517234
I bet some of our guys
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