Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards

On Thu, Feb 16, 2017 at 10:42 AM, Christopher Hoover wrote: > Ntp has support to pick up hardware packet timestamps from the Linux > kernel. I wrote the patch; it was merged years ago. > > I'm wrong about this. The patch I wrote added support for SO_TIMESTAMPNS (see [1]).

Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards

Yes, that is the normal "best practice case". But the OPand myself some years go both have a difference use case. In this case no other machine needs to know the time. I only care about one computer. The reason I used NTp back then and he is using it now is to calibrate the rate of a

Re: [time-nuts] Problems with CHU voice announcements

All fine now Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y les...@veenstras.com Physical and US Postal Addresses 5 Shrine Club Drive (Physical) 452 Stable Ln (RFD USPS Mail) Keyser WV 26726 GPS: 39.336826 N 78.982287 W (Google) GPS: 39.33682 N 78.9823741 W (GPSDO) Telephones: Home:

Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards

> Le 16 févr. 2017 à 13:05, Mike Cook a écrit : > > >> Le 16 févr. 2017 à 04:09, MLewis a écrit : >> >> On 15/02/2017 1:17 PM, Chris Albertson wrote: >>> Why set up a dedicated NTP server if you only have two computers that will >>> use it? ... You

Re: [time-nuts] Problems with CHU

Bob Camp wrote: > Once upon a time it was done with a mechanical marvel of a device. And before those electromechanical contraptions, there was this :): https://en.wikipedia.org/wiki/Speaking_clock#/media/File:1937TimeVoice.jpg -Ruslan On Thu, Feb 16, 2017 at 1:18 PM, Bob Camp

Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards

shouldbeq...@gmail.com said: > I run PTP on a Raspberry Pi using its onboard USB connected NIC, and onboard > NICs on HP and Dell servers, I see +- 5 microsoconds jitter in the one way > delay across 4 fanless HP switches, ... Could you please say more? USB 2 has a 125 microsecond polling

Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards

sub Millisecond is EASY. my Apple 27" iMac is doing that right now using just Internet pool servers. Yes I have a very good Internet connection. 100 Mbit fiber and then the last meter is 1000BaseT But still, milliseconds are really EASY. It is sub microseconds that requires things like PTP

Re: [time-nuts] Problems with CHU voice announcements

The voice announcement problem appeared to be fixed around 17:45 P.M. John WA4WDL jmfra...@cox.net wrote: > I do not know if anyone else noticed, but since sometime before 17:00 UTC, > the > voice announcements on the 7.850 MHz signal have been messed up. Some times > the

Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards

Yo Chris! On Wed, 15 Feb 2017 23:48:39 -0800 Chris Albertson wrote: > An ntpd that is running as > strum one that has no other ntpd connected to it has VERY little to do That would be a marginal configuration. I have yet to see a GPS that did not lose sat lock, or

Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards

Yo Chris! On Wed, 15 Feb 2017 23:55:02 -0800 Chris Albertson wrote: > On Wed, Feb 15, 2017 at 11:48 PM, Chris Albertson > wrote: > > On Wed, Feb 15, 2017 at 10:30 PM, Ruslan Nabioullin > > wrote: > >> On 02/15/2017

Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards

Ntp has support to pick up hardware packet timestamps from the Linux kernel. I wrote the patch; it was merged years ago. -ch 73 de AI6KG On Thu, Feb 16, 2017 at 9:59 AM, Denny Page wrote: > If your Ethernet chipset (mac or phy) has timestamping capabilities, you > can

Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards

On Thu, Feb 16, 2017 at 7:55 AM, Chris Albertson wrote: > > But PTP requires special hardware. You may not have this. > I have to disagree. I run PTP on a Raspberry Pi using its onboard USB connected NIC, and onboard NICs on HP and Dell servers, I see +- 5

Re: [time-nuts] Problems with CHU

Hi John, thanks for reporting this problem. One of my colleagues is heading out to CHU to look into it right now. On Thu, Feb 16, 2017 at 12:52 PM, wrote: > I meant to type 7.850 MHz, re-engaged brain. > > John WA4WDL > > jmfra...@cox.net wrote: > > > > I do not know

Re: [time-nuts] Problems with CHU

Hi Not quite sure what happened to the original message before it got here … The voice / time announcements on WWV and CHU date back quite a ways. I wonder just how old the gear they currently are using is? Once upon a time it was done with a mechanical marvel of a device. Bob > On Feb

[time-nuts] Problems with CHU voice announcements

I do not know if anyone else noticed, but since sometime before 17:00 UTC, the voice announcements on the 7.850 MHz signal have been messed up. Some times the announcements are missing, other times they are incorrect. I have not checked the other frequencies. I was working in my shop and

Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards

If your Ethernet chipset (mac or phy) has timestamping capabilities, you can use Chrony which has hardware timestamp support. This greatly improves accuracy, and generally eliminates the CPU loading issue. Denny ___ time-nuts mailing list --

Re: [time-nuts] Problems with CHU

I meant to type 7.850 MHz, re-engaged brain. John WA4WDL jmfra...@cox.net wrote: > > I do not know if anyone has noticed, but since sometime before 17:00 UTC, the > voice announcements on the 7.8350 kHz signal have been messed up. Some times > they are missing, other times they are

Re: [time-nuts] Vintage Frequency Measurement

On 2/15/17 3:07 PM, Alberto di Bene wrote: On 2/15/2017 5:29 PM, Tim Shoppa wrote: For those of us who have to translate between the old "cps" and the modern "Hz", I found this handy conversion table on the web: http://www.aqua-calc.com/convert/frequency/hertz-to-cycle-per-second Tim N3QE

Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards

Hi Whatever you do on the server, the same impacts will be felt on the client side. You may be able to do this or that on a server to allocate resources. On a client workstation, resource allocation is likely to be a bit more difficult. You may not even have control over which OS is being

Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards

> Le 16 févr. 2017 à 04:09, MLewis a écrit : > > On 15/02/2017 1:17 PM, Chris Albertson wrote: >> Why set up a dedicated NTP server if you only have two computers that will >> use it? ... You could save some money and just run NTP on the two computers. >> ... NTP is

Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards

Hi > On Feb 16, 2017, at 1:30 AM, Ruslan Nabioullin wrote: > > On 02/15/2017 01:17 PM, Chris Albertson wrote: >> Why set up a dedicated NTP server if you only have two computers >> that will use it?Your server will be accurate to a few >> microseconds but your two

Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards

> But notice that only 1/2 of the wires in a standard Ethernet cable are in > use. Unless you are using Gigabit Ethernet. -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Vintage Frequency Measurement

On 2/15/2017 5:29 PM, Tim Shoppa wrote: For those of us who have to translate between the old "cps" and the modern "Hz", I found this handy conversion table on the web: http://www.aqua-calc.com/convert/frequency/hertz-to-cycle-per-second Tim N3QE Nahhh this is much better :-)

Re: [time-nuts] Vintage Frequency Measurement

Another nice example of "before there were frequency counters": "Methods of using standard-frequency radio transmissions", 1934 http://tf.nist.gov/general/pdf/2423.pdf "Recent developments in precision time-keeping", 1934

Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards

Your processing machine is going to be running NTP with a reference clock being your local status 1 NTP server I think the processing machine would see a lighter load if it's NTP was using GPS as the reference rather thennother NTP server. In other words the processing box, the one with the

Re: [time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards

On Wed, Feb 15, 2017 at 11:48 PM, Chris Albertson wrote: > On Wed, Feb 15, 2017 at 10:30 PM, Ruslan Nabioullin > wrote: >> On 02/15/2017 01:17 PM, Chris Albertson wrote: >>> >>> Why set up a dedicated NTP server if you only have two computers >>>

Re: [time-nuts] Vintage Frequency Measurement

It may be that they were all once regarded as Wavemeters, i.e. for measuring wavelength, but there was a distinction that is often dropped... the Absorption Wavemeter, as opposed to the "normal" variety. Much like a video recording almost universally referred to as a "video"... a video what?