Poul-Henning,
On 11/09/2014 09:44 PM, Poul-Henning Kamp wrote:
In message CABbxVHtommjwSWq1i=oH-u1S=G6P=xu8e0yzekadg-vchgk...@mail.gmail.com
, Chris Albertson writes:
NTP does not pick the best clock. NTP finds
the subset of clocks that track each other.
NTP does indeed find the
In message 546070b3.1010...@rubidium.dyndns.org, Magnus Danielson writes:
The NTP scatter-plot wedge is another way to present it, and finding the
tip of that wedge is really about finding the min-value of delay in
each direction prior to doing the two-way time-transfer equations.
The
Hello time-nuts,
I have spent a lot of time recently with Frequency Electronics, Inc. (FEI)
oscillators including the FE-5680A, FE-5680B, FE-5650A, and FE405B and just
wanted to pass on some of my findings. Not everything I am including here
is new, but figured I would include the informattion
- that there is (eventually) a Windows implementation.
I'm writing the code to be as portable as I can make it, but I have
neither Windows machines nor clue how to program for their kernel-time-api.
- that it responds to ntpq -pn and ntpq -crv commands so that it can be
easily remotely
In message 43713AD334A7485B8B0CCED799C6C19A@Alta, David J Taylor writes:
Personally, I feel that the ability to monitor the workings of an NTP
implementation remotely is an important feature of the (present) software.
So, this is one thing I really don't understand...
You can monitor
From: Poul-Henning Kamp
[]
Personally, I feel that the ability to monitor the workings of an NTP
implementation remotely is an important feature of the (present) software.
So, this is one thing I really don't understand...
You can monitor all your clients from your server if you want to,
by
In message 647BB61DCE1F4679A45CD5C1DB1FE963@Alta, David J Taylor writes:
I want to
be able to monitor a number of servers from a central monitoring point
(which might not even be running NTP), and using ntpq with its different
options is, for me, an ideal way to do that.
First of
Poul-Henning Kamp writes:
In message 0AA8645271A94DF3968C90FE6BF94276@Alta, David J Taylor writes:
- that there is (eventually) a Windows implementation.
I'm writing the code to be as portable as I can make it, but I have
neither Windows machines nor clue how to program for their
Rick,
NMEA 0138 is a standard language. Yes it does output the signal
strength and visible sats, although I don't remember which output
sentences give that data.
I haven't looked at the serial output, so I don't know which sentences
are supported. Probably good to look at the documentation for
Hi
Right now the box with the GPS in it seems to be much more useful than the one
that does not have a GPS. If they all are the same price, just buy GPS units.
You can always pull the GPS out. Putting it back in is much more
problematic.That assumes you are using them each on their own, and
Hi
On Nov 10, 2014, at 1:59 AM, Poul-Henning Kamp p...@phk.freebsd.dk wrote:
In message 4cdc0090-dd4b-4380-acc1-40a80d3bc...@n1k.org, Bob Camp writes:
Hi
Here’s what I’m saying:
The NTP algorithm as it is written and as it is implemented results
in an output clock that does
On Nov 10, 2014, at 2:49 AM, Magnus Danielson mag...@rubidium.dyndns.org
wrote:
On 11/09/2014 07:11 PM, Bob Camp wrote:
Hi
On Nov 9, 2014, at 11:18 AM, Chris Albertson albertson.ch...@gmail.com
wrote:
On Sat, Nov 8, 2014 at 11:13 PM, Neil Schroeder gign...@gmail.com wrote:
I've taken a hybrid approach I'm using an in circuit ESR meter to determine
whether cap needs to be replaced
Tantalum capacitors usually fail because of running them too close or at rated
voltage. HP unlike others in the industry did not tend to do this so I've had
a low incidence of
A linear 5 to 10 MHz doubler that may be of
interest is described in the March-April 2011
issue of QEX. I use it to double the output of
an Vectron double oven 5 MHz standard to 10 MHz.
Extensive design and performance data is provided for
the basic breadboard, a PC version of the breadboard
and a
As long as the chip in question is still available in surface mount, one
can use a SM to DIP adapter. I use these all the time to evaluate and
prototype with SM chips. It would be expensive to rechip a whole unit,
but onesies in case of a failure is OK.
David
On 11/9/14 10:36 PM, Bob Camp
The GPGSV is the sentence that reports satellites' SNR. See also:
http://www.gpsinformation.org/dale/nmea.htm#GSV
On Mon, Nov 10, 2014 at 10:59 AM, Lizeth Norman normanliz...@gmail.com wrote:
Rick,
NMEA 0138 is a standard language. Yes it does output the signal
strength and visible sats,
Dear Rick,
When asking questions such as this, it is helpful to know why you need to
know the part number.
Basically to complete my documentation, but there is more to it...
Please let me start with a nut shell introduction. I'm going to build a GPSDO
and will use the following key
Thanks!
Getting hooked up to the serial output will be my next step.
Rick
On Nov 10, 2014, at 6:20 AM, Azelio Boriani azelio.bori...@gmail.com wrote:
The GPGSV is the sentence that reports satellites' SNR. See also:
http://www.gpsinformation.org/dale/nmea.htm#GSV
On Mon, Nov 10, 2014 at
I had been unsuccessful communicating with these units using the RS232 to RS422
cable hack that Stewart Cobb described in his original post
(https://www.febo.com/pipermail/time-nuts/2014-October/087274.html). I was
able to see, via a scope, the data coming out of the REF 1 unit, but it was
Yes indeed for a real RS232 to RS 422 all 4 wires are required. Its a
balanced communications protocol.
The RS232 trick has been around many years. It ha sa low noise margin and
does work with most modern RS232 3.3-5V type adapters. Its simple and
generally works as it did for me.
Regards
Paul
Poul-Henning,
On 11/10/2014 09:16 AM, Poul-Henning Kamp wrote:
In message 546070b3.1010...@rubidium.dyndns.org, Magnus Danielson writes:
The NTP scatter-plot wedge is another way to present it, and finding the
tip of that wedge is really about finding the min-value of delay in
each
John,
thank you for your post on the time-nuts list.
Unfortunately, I couldn't locate the article you are refering to. All I
could find are just two associated files, a BOM and an Excel sheet.
Could you please send me a link or a copy of the article?
Thanks,
Adrian
On 11/09/2014 10:54 PM, Chris Albertson wrote:
On Sun, Nov 9, 2014 at 12:45 PM, Bob Camp kb...@n1k.org wrote:
Hi
The main point is that NTP picks *one* source from among it’s batch of
inputs and uses that. The ADEV of the output can be no better than the ADEV
of the output.
The statement
Hi
On Nov 10, 2014, at 6:33 PM, Magnus Danielson mag...@rubidium.se wrote:
Bob,
On 11/10/2014 01:17 PM, Bob Camp wrote:
On Nov 10, 2014, at 2:49 AM, Magnus Danielson mag...@rubidium.dyndns.org
wrote:
On 11/09/2014 07:11 PM, Bob Camp wrote:
Hi
That may (or may not) give you
David and Poul-Henning,
On 11/10/2014 10:34 AM, Poul-Henning Kamp wrote:
In message 647BB61DCE1F4679A45CD5C1DB1FE963@Alta, David J Taylor writes:
I want to
be able to monitor a number of servers from a central monitoring point
(which might not even be running NTP), and using ntpq
In message 546152ac.8090...@rubidium.dyndns.org, Magnus Danielson writes:
Monitoring as such is an important task, and some of the NTP clients
might be servers in other contexts, and then it makes sense to monitor
that they got their NTP time into shape.
For which there has existed a
Poul-Henning,
On 11/11/2014 01:15 AM, Poul-Henning Kamp wrote:
In message 546152ac.8090...@rubidium.dyndns.org, Magnus Danielson writes:
Monitoring as such is an important task, and some of the NTP clients
might be servers in other contexts, and then it makes sense to monitor
that
Hi Perry:
(shameless plug) Have you measured the tantalum caps?
I sell a combined ESR Capacity meter that does in circuit tests on powered
down circuits.
http://www.prc68.com/P/Prod.html#ESR
For an example of it's use on a Heathkit GC-1000 WWV clock see:
I don't think ntp requires nor should have anything like a dedicated multi
system monitoring platform of its own.
The fact is that today's modern data collection methods are more than
adequate - ntpd need only store its values in an accessible place and
a graphite agent or ajna or your choice of
I bought one of those ESR testers some time ago. It works very well. It is
from Russia, but ordering from Brooke is much easier :-)
Joe Gray
W5JG
On Mon, Nov 10, 2014 at 6:51 PM, Brooke Clarke bro...@pacific.net wrote:
Hi Perry:
(shameless plug) Have you measured the tantalum caps?
I sell
I'm just saying that the NTP processing and the NTP monitoring may not
need to run by the same daemon necessarily, just because we did that in the
past. Pulling things from the kernel provide more isolation, and the
monitor daemon can have special code to handle security issues of
monitoring,
What you can do is to have a set of free-running oscillators, use them to
build a ensemble paper-clock average, which when weighing them against the
stability of the ensemble clock the individual stability will expose
itself, and that ensemble clock will have some weighted frequency, and the
Poul-Henning Kamp writes:
In message 546152ac.8090...@rubidium.dyndns.org, Magnus Danielson writes:
Monitoring as such is an important task, and some of the NTP clients
might be servers in other contexts, and then it makes sense to monitor
that they got their NTP time into shape.
From the current crop of ebay OCXO's available, what have you actually used
that you would recommend for the following? Sine output, either 5V or 12V,
better than 0.2ppm stability after warmup. I plan on putting things in a
sealed box, so there shouldn't be too wide a temperature fluctuation.
jg...@zianet.com said:
I want to use it as a standalone reference to PLL a 14.4 MHz VCXO. With the
right divisors, I can get both the 10 MHz (/10/10) and the 14.4 MHz (/16/9)
down to 100 KHz.
You can run at 400 KHz by dividing by 5/5 and 4/9.
I could use a GPSDO, but that means needing a
You can run at 400 KHz by dividing by 5/5 and 4/9.
True. Either will work.
You said 0.2ppm stability. What do you need for accuracy and/or how
are you going to calibrate your setup?
I will initially calibrate the OXCO against my HP GPSDO. Idealy, it will
only need checking against the GPSDO
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