Dave M wrote:
Hello,
I have a PRS10 rubidium which gives a 1pps output. The output is a
10 us positive pulse.
I need to convert that to a 50:50 duty cycle pulse. Still 1pps.
I'm hoping for a simple circuit rather than having to use a pic.
I don't mind a bit of propagation delay, but I
Mr HeathKid,
What is your reason for hating dst. The changeover is a pain - but after
that, what is the problem?
Jim
On 22 July 2011 14:23, Heathkid heath...@heathkid.com wrote:
I live at 39° 57' 46 N and I absolutely HATE DST! Yes, Indiana... we
haven't had DST for too long. It's bad and
I was wondering how one would even use a PIC.
You can make a 10MHz to 1PPS divider using a tiny 8-pin PIC. I have extras
here. Send me email off-line if you want one. Cost is $2.
/tvb
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On 07/22/2011 05:38 AM, Dave M wrote:
Hello,
I have a PRS10 rubidium which gives a 1pps output. The output is a
10 us positive pulse.
I need to convert that to a 50:50 duty cycle pulse. Still 1pps.
I'm hoping for a simple circuit rather than having to use a pic.
I don't mind a bit of
Hello,
I have a PRS10 rubidium which gives a 1pps output. The output is a 10
us positive pulse.
I need to convert that to a 50:50 duty cycle pulse. Still 1pps.
I'm hoping for a simple circuit rather than having to use a pic.
I don't mind a bit of propagation delay, but I need to
Hi Shaun
I may have missed a email or something.
I think. You are using the 8170s 1 MC out to drive a loran commercial
simulator that then drives the austron. Do I understand this correctly?
I designed and built a few simple chips loran c sim about 1.5 years ago and
shared that information on
I was just thinking (dangerous I know)... Has anyone attempted to build a
stand-alone oscillator that is disciplined via NTP?
i.e. NTP keeps it on-frequency... And I'm not talking about NTP that is locked
to a local GPS, I'm curious about purely syncing to
other NTP servers over a network. (The
On Fri, Jul 22, 2011 at 2:27 PM, Jason Rabel
ja...@extremeoverclocking.com wrote:
I was just thinking (dangerous I know)... Has anyone attempted to build a
stand-alone oscillator that is disciplined via NTP?
I believe the Symmetricom NTP servers do this, whether or not they
have external
I must say Jason,
Yes, you are day dreaming, but hey, that is where ideas come from.
I do not play with NTP, but isn't that the same thing ( or similar) as
disciplining my local clock when I have it update against a
reference like NIST over the Internet ? In other words, NTP is used to keep
No exactly. A PPS generator syncrhonized with UTC time, using a GPS ntp
server in the same LAN. Not too bad... but several microseconds jittery
:) enough for my application then. Probably with long time constants it
is doable, but if the ntp server is in the internet, and not in a LAN, I
El 22/07/2011 20:39, michael taylor escribió:
I think all NTP server appliances have this functionality by their
nature, whether or not the oscillator is of particular high quality
(low noise) or not. Many of the low-end ones likely just use a
standard oscillator in a can [2] that the embedded
On 07/22/2011 11:48 AM, Javier Herrero wrote:
El 22/07/2011 20:39, michael taylor escribió:
I think all NTP server appliances have this functionality by their
nature, whether or not the oscillator is of particular high quality
(low noise) or not. Many of the low-end ones likely just use a
Paul,
Thanks for the reply. I have been out of the loop so to speak for a
while, so I did not know about your simulator. I'll look in the archives
and retrieve the information. The story behind the 8170 and 2042 is I
purchased them well in advance of LORAN (in NA at least) going silent, but
Hello Everyone,
I thought some of you might be interested in the following. A few months ago, a
few time-nuts discussed what they had done to convert existing equipment to a
large GPS clock. I elected to design my own clock display instead. Mine is fed
by a Garmin GPS-35 GPS and it uses a 64 x
On 7/22/11 11:59 AM, Chuck Forsberg WA7KGX N2469R wrote:
On 07/22/2011 11:48 AM, Javier Herrero wrote:
El 22/07/2011 20:39, michael taylor escribió:
I think all NTP server appliances have this functionality by their
nature, whether or not the oscillator is of particular high quality
(low
This is exactly what an NTP server does. It adjusts the rate of a
local clock so that the local clock advances at the same rate is the
set of Internet servers that have passed a clock selection test. NTP
does this very well considering the uncertainly of the lag over the
internet. There is a
Hi Bert:
Which Sure Electronics display board did you use (they make a bunch of
different ones)?
http://www.sureelectronics.net/category.php?id=60
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.End2PartyGovernment.com/
Bert, VE2ZAZ wrote:
Hello Everyone,
I thought some of you
Hi Brooke,
I go by memory here, but I believe it is a pair of DE-DP13112 (P4 32X8 3208 Red
LED Dot Matrix Unit Board SPI Like), which are currently on sale for $11 ea. I
bought mine on eBay.
Cheers,
Bert, VE2ZAZ
From: Brooke Clarke bro...@pacific.net
To:
That's what I come up with from their web site. . . Great Clock!!
73's,
Randy Hunt, KI6WAS
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bert, VE2ZAZ
Sent: Friday, July 22, 2011 1:54 PM
To: Brooke Clarke; time-nuts@febo.com
Subject:
On Fri, Jul 22, 2011 at 2:48 PM, Javier Herrero jherr...@hvsistemas.es wrote:
El 22/07/2011 20:39, michael taylor escribió:
I think all NTP server appliances have this functionality by their
nature, whether or not the oscillator is of particular high quality
(low noise) or not. Many of the
Hi
The easy way is to take a pps off of your external oscillator and feed that
into a port on your NTP server. Let NTP tell you where that pps is. Don't let
NTP lock to the pps, just let it report it's position.
After that all you need to do is write some code to read the location of the
After that all you need to do is write some code to...
Oh - if I had a nickel for every time I've heard that!
Brent
On Fri, Jul 22, 2011 at 6:07 PM, Bob Camp li...@rtty.us wrote:
Hi
The easy way is to take a pps off of your external oscillator and feed that
into a port on your NTP server.
List,
Someone asked about surplus rubidium stability.
Here are my results.
I had five Lucent Rubidium’s. Three were from RDR in centennial, CO and two
were from the Huntsville hamfest.
Before measuring stability, I ran them for a week on the bench.
Using A Lucent GPS and a HP 5370B counter
On Fri, 22 Jul 2011 13:27:34 -0500
Jason Rabel ja...@extremeoverclocking.com wrote:
I was just thinking (dangerous I know)... Has anyone attempted to
build a stand-alone oscillator that is disciplined via NTP?
i.e. NTP keeps it on-frequency... And I'm not talking about NTP that is
locked to
A few years ago, I did a similar clock for use in the car, but using a 4 line lcd. I never
thought about correcting it for the software delays- an excellent idea Bert, thanks. I
guess I am going to have to do a bit of a re-write sometime soon. Thinking about it, I
could just feed the 1pps into
Perrier:
Can you clarify your results? What do you mean by 200 to 800ps above or
below 10MHz? Is that how much they gained or lost in a one second period
(meaning 2 to 8E-10 error)? Or was it error in period measurement (hopefully
not, 8E-3 error).
Jose
-Original Message-
Ha, you may well ask. The reason to hate DST is given to us in the
southern parts of Australia, by our Queensland cousins:
The problems with DST is :
1. The Cows get very confused and the farmers have problems milking them.
2. The chickens don't know anymore when to lay the eggs. it is
On 07/23/2011 12:07 AM, Bob Camp wrote:
Hi
The easy way is to take a pps off of your external oscillator and feed that
into a port on your NTP server. Let NTP tell you where that pps is. Don't let
NTP lock to the pps, just let it report it's position.
After that all you need to do is write
On Fri, Jul 22, 2011 at 2:30 PM, Javier Herrero jherr...@hvsistemas.es wrote:
I've found a plot of the ntp-synthesized GPS output compared with the
UTC-aligned GPS from a Thunderbolt. The generated PPS output was 1us wide,
and it is represented in infinite persistence to get an idea of the
On 7/22/11 3:46 PM, brent evers wrote:
After that all you need to do is write some code to...
Oh - if I had a nickel for every time I've heard that!
Brent
When I worked in the physical effects business, we'd get a set of
storyboards from a director, and we'd have to figure out how we were
Yes but in this case it really is easy; Below is an outline (don't
try to compile it.). It has a slight problem because just using
sleep is kind of simplistic. One should wait on the new second and
add some error chacking Point here is just to show that this is not
weeks and weeks worth of
First, catch your rabbit...
Jim Lux
On 7/22/11 3:46 PM, brent evers wrote:
After that all you need to do is write some code to...
Oh - if I had a nickel for every time I've heard that!
Brent
When I worked in the physical effects business, we'd get a set of
storyboards from a director,
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